Assessing prerequisites as a measure of success in a principles of finance course.
Blaylock, Alan ; Lacewell, Stephen K.
ABSTRACT
This paper seeks to determine if student success in courses that
serve as prerequisites to the principles of finance course is carried
over to success in the actual finance course. Also, additional
variables, such as the gender of the student, the number of background
courses taken, and the time since the courses were taken are analyzed to
determine if they have a direct impact on final grades. The quantity of
prerequisite courses and their timing are found to significantly
influence student performance in the introductory finance course. This
shows that adequate and timely exposure to prerequisite subjects are
helpful in learning finance.
INTRODUCTION
Most principles classes of all disciplines have few, if any, formal
prerequisite class requirements. The principles of finance class is
usually the exception requiring prerequisites in both economics and
accounting and often a math or statistics course. Since the principles
of finance is by nature a very quantitative course, it would seem that a
student's success in the prerequisite classes should carry over to
the finance course.
Making this topic more interesting are the ever-changing
requirements necessary for colleges of business to attain AACSB
accreditation. Even a casual glance through the latest AACSB Eligibility
Procedures and Standards for Business Accreditation (2003) reveals an
increased emphasis on standards related to the assurance of learning.
Thus, the design of courses used as prerequisites for the basic finance
course as well as the design of finance curriculums in general have
taken on an increased level of importance.
This paper seeks to determine if student success in courses that
serve as prerequisites to the principles of finance course is carried
over to success in the actual finance course. Also, additional
variables, such as the gender of the student, the number of background
courses taken, and the time since the courses were taken are analyzed to
determine if they have a direct impact on final grades.
LITERATURE REVIEW
A study of the factors that determine performance in business
related courses is not necessarily groundbreaking research. The area of
economics, for example, includes papers by Schuhmann, McGoldrick, and
Burrus (2005), Laband and Piette (1995), Anderson, Benjamin, and Fuss
(1994), Bosshardt and Watts (1990), and Borg, Mason, and Shapiro (1989).
Studies that examine factors related to performance in accounting
classes include Gracia and Jenkins (2003), Drennan and Rohde (2002),
Murphy and Stanga (1994), Graves, Nelson, and Deines (1993). Other
studies related to student preparedness and student performance include
one on business communications (Marcal and Roberts, 2000) and a study
concerning performance on the Educational Testing Service Major Field
Exam in Business (Bagamery, Lasik, and Nixon, 2005). However, the very
few studies performed on the area of finance have mostly focused on
self-reported qualitative factors such as student effort and test
anxiety. Papers that study the quantitative relationship between student
success in a principles of finance course and student success in the
prerequisites needed for this class are very few. Only one paper by
Didia and Hasnat (1998) touches on this subject. They found that a
student's cumulative GPA has a statistically significant positive
impact on success in the finance course. They also noted that a
student's prior performance in accounting, economics, and math
tended to carry over to success in finance. This study adds other
variables not considered in the Didia and Hasnat study that may foretell success or failure in the basic finance course.
DATA AND METHODOLOGY
This study uses academic transcript data for students enrolled in
six sections of the introductory finance course in the fall 2004 and
spring 2005 semesters. All sections were taught by the same instructor
so faculty influence is not an issue. Student performance is measured by
the semester average for each student and is obtained from the
instructor. All other information is obtained from student transcripts.
One hundred forty out of 189 observations are usable.
Didia and Hasnat (1998) explain the grade received in a principles
of finance class as function of maturity, background, aptitude, effort,
and faculty contribution. They find all of these factors significantly
influence student performance in the principles of finance course. Our
study concentrates on the background component in detail. Didia and
Hasnat use GPAs of prerequisite courses to measure student background.
Specifically, they use the average GPA for the first two accounting
courses, the average GPA for the first two economics courses (micro and
macro), and the highest GPA of all math courses taken. Our present study
expands on these variables. Essentially, our study includes the number
and timing of prerequisites taken in addition to their GPAs.
The principles of finance course usually requires prerequisites
courses in the areas of math, accounting, and economics. Our measures of
student background relate to not only the academic performance as
measured by grades, but also the quantity, and timing of these
prerequisites courses. Similar to Didia and Hasnat, academic performance
in prerequisite courses is measured by the average GPA for all
accounting courses taken, the average GPA for all economics courses
taken, and the average GPA for all math courses taken at the College
Algebra level and above. Using only the GPAs in the math classes at or
above the College Algebra level reduces any grade inflation from
developmental math courses. To explain further, new students in the
university that are determined to be weak in the area of math are
enrolled in developmental math courses to prepare them for College
Algebra. The weaker the student the more developmental math courses that
are taken. High grades in developmental math courses are obviously not
on par with high grades in College Algebra and above. A student may have
many high developmental math grades but only mediocre algebra and
calculus grades. Using all math grades to include the developmental math
grades would not provide an accurate measure of a student's math
background. However, as indicated below, a dummy variable measures if a
developmental math course has been taken.
In addition to academic performance in the perquisite courses, the
quantity of those prerequisite courses are also included as a measure of
student background. Some students may have more exposure to these
prerequisite areas than others which may lead to a better finance grade.
For instance, students that have taken more than the first two
accounting or economics courses, regardless of grade, may have a better
grasp of these principle areas such that their performance in finance is
enhanced. To incorporate this information, variables are added that use
the number of math, accounting, and economics courses for which the
student has taken. Also, although the GPAs of any developmental math
courses are not included in the academic performance variables mentioned
previously, a variable is included to indicate if any developmental math
courses were ever taken.
A student's ability to harness prerequisites knowledge may be
limited by the length of time since the prerequisites class was taken.
Thus, the timing of prerequisite courses should be included in addition
to the academic performance and quantity of prerequisite courses taken.
Variables related to the timing of the prerequisites simply indicate the
number of semesters since the last prerequisites course in each of the
areas (math, accounting, and economics) was taken. A similar variable is
used by Austin and Gustafson (2006).
As in Didia and Hasnat, we use cumulative GPA at the time of
enrolling in the principles of finance course not only as a measure of
student aptitude but also as a means of controlling the other
GPA-related independent variables. Variables are also included to
indicate gender and transfer status, and in addition to Didia and
Hasnat, variables are included to indicate if the student is a finance,
accounting, or economics major.
Although not usually a formal prerequisite, the area of statistics
may also be useful in the finance class, especially when studying
measures of risk such as variance and beta. Since statistics is not a
formal prerequisite for the principles of finance course, the majority
of students had not taken any statistics courses (only 71 out of 189).
Using variables related to grades and timing of a student's
statistics course severely limits the sample size. A variable that
measures the quantity of statistics courses taken, however, would use
the full sample size. Therefore, the variable measuring the quantity of
statistics courses taken is used with the full sample, and the variables
measuring the GPA and timing of a student's statistics course is
used with the reduced sample. This results in 69 usable observations.
Two models are used. The first limits the measurements of
statistics background to only the number of statistics courses taken
while the second adds variables that measure the grades and timing of
statistics courses. The first model is
[MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] Equation (1)
The second model is
[MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] Equation (2)
Where C is a constant; GENDER is a dummy variable that equals 1 if
the student is male and 0 if the student is female; TRANSFER is a dummy
variable that equals 1 if the student is a transfer student; DEVMATH is
a dummy variable that equals 1 if the student has taken any
developmental math course; ACC_MAJOR, ECON_MAJOR, and FIN_MAJOR are
dummy variables that each equal 1 if the student is an accounting major,
economics major, or finance major, respectively, and 0 otherwise;
MATH_AGE, ECON_AGE, ACC_AGE, and STATS_AGE equal the number of semesters
since, respectively, a math, economics, accounting, or statistics course
was taken, MATH_GPA, ECON_GPA, ACC_GPA, and STATS_GPA equal the average
GPA for the student's math, economics, accounting, and statistics
courses, respectively, MATH_Q, ECON_Q, ACC_Q, AND STATS_Q equal the
number of, respectively, math, economics, accounting, and statistics
courses were taken, and GPA equals the cumulative GPA. Descriptive
statistics for each of the variables are presented in Table 1.
RESULTS
The possible dependence between the prerequisite GPAs with each
other as well as the cumulative GPA may result in multicollinearity. A
rule of thumb suggested by Griffiths, Hill, and Judge (1993, page 435)
is that multicollinearity may be a problem given a correlation
coefficient greater than 0.8 or 0.9. Hair, Anderson, Tatham, and Black
(1995, page 127) suggest harmful collinearity with correlations
coefficients above 0.9. Hair, et. al. and Myers (1990, page 369) suggest
multicollinearity may be problem with Variance Inflation Factors (VIFs)
greater than 10.
The correlation matrix in Table 2 indicates relatively higher
correlations are associated with the ages of the prerequisites courses.
STATS_GPA has notable high correlations with MATH_AGE and ECON_AGE, and
the high correlation of 0.85 with ACC_AGE indicates a possible problem
with multicollinearity. GPA also has a relatively high correlation with
STATS_AGE. Notice that this potential problem only impacts those
variables in Equation 2. Table 3 reports Variance Inflation Factors
(VIFs) for each non-binary variable. The correlations of the variables
and their VIFs in Equation 1 (designated as Equation 1A) do not indicate
any potential problem with multicollinearity. For Equation 2 (designated
as Equation 2A), the correlations involving STATS_GPA may pose a
problem. Although none of the VIFs break the threshold noted above, a
few are dangerously high and should warrant concern during model
selection. Table 3 also reports VIFs for reduced models to be discussed
shortly.
Another concern is the large number of variables in each equation
compared to the sample size. A stepwise regression could be performed,
but Greene (1997, page 401) notes the possible faulty inference procedures associated with it. All of these variables are included due
to the possible relationships with student performance in the principles
of finance course. However, the inclusion of so many variables may cloud
the results so that the marginal variable contributes little if any
explanatory power. The solution should hold to the theoretic necessity
of variable inclusion and at the same time use the mechanical nature of
the stepwise regression process. The Akaike Information Criterion (AIC)
and the Schwartz Criterion are used to arrive at a more parsimonious model. All combinations of variables are included in the equation to
find the best AIC and Schwartz Criterion statistic.
The OLS coefficients from the two models are given in Table 4. In
Equation 1 (designated as Equation 1A) three variables are significant,
two of which, MATH_Q and ACC_AGE, are unique to this study. MATH_Q
indicates that a student's final semester average in principles of
finance increases by about 3 percentage points for each math class
taken. ACC_AGE indicates that the semester average decreases by about 1
percentage point for every semester since the student has taken an
accounting class. Not surprisingly, GPA contributes largely to the
student's semester average.
The model of best fit as determined by the AIC and Schwartz
Criterion is designated as Equation 1B. This equation also has the
second highest adjusted R squared of all the possible models. MATH_Q,
ACC-AGE, and GPA are all still statistically significant, although the
significance of ACC_AGE is reduced. GENDER and MATH_AGE become
significant in this model. A puzzling finding is the positive
coefficient for MATH_AGE. This shows that student performance improves
the longer the amount of time has elapsed since the last math class was
taken. A possible explanation could be that students with better math
ability complete math requirements early in their academic career,
resulting in a longer period since the last math class was taken, while
those with poorer math ability would have only recently completed a high
level math course.
Equation 2 (designated as Equation 2A) adds STATS_AGE and STATS_GPA
to the model with a cost of a reduced sample size. GPA still remains the
largest significant contributor to student scores, but MATH_Q and
ACC_AGE lose their significance. This could be a result of the reduced
sample size, the inclusion of the two additional variables, or both.
Notice that the new variable, STATS_GPA, is positively significant.
STATS_Q was not significant in Equation 1A. This may show that a
proficient statistics knowledge and not just an exposure to a statistics
background is important to a student's performance.
A concern for Equation 2 was the possible problem with
multicollinearity. Since the "age" variables evidenced the
potential problem, these variables (MATH_AGE, ECON_AGE, ACC_AGE, and
STATS_AGE) were all removed from the model. Although not reported here,
all remaining variables kept their signs, and STATS_GPA and GPA retained
their levels of significance. For this model, GPA was found to have a
VIF of 5.88 with the second highest VIF of 3.03 associated with
ECON_GPA.
The model of best fit for Equation 2 as determined by the AIC and
Schwartz Criterion is designated as Equation 2B. This equation also has
the highest adjusted R squared of all the possible models. STATS_GPA and
GPA retain their levels of significance. Interestingly, the model fits
the data better with ECON_GPA. Another puzzling finding is its negative
coefficient. The authors can offer no reasonable explanation for this
phenomenon. Notice that the VIFs reported in Table 3 indicate no
evidence of multicollinearity.
An observation may be made concerning the sign change in several
variables from Equation 1A to Equation 2A. For instance, ACC_GPA is
positive in Equation 1A, yet negative in Equation 2A. This is because
Equation 2A uses a different sample than Equation 1A. To fully
appreciate the different characteristics of the sample of students who
have not taken statistics and the sample of students who have, Equation
1A is run using both sub-samples. These new equations are designated as
Equation 1C and 1D. STATS_Q is omitted from these regressions since
STATS_Q would equal zero for all observations for the sub-sample of
students who have not taken a statistics course. Although not reported
here, STATS_Q was included when using the sub-sample of students having
a statistics course, and the findings are similar to those that are
reported in Table 4.
Equation 1C uses the sub-sample of students who have taken a
statistics course. Notice that the coefficients have the same sign as
those in Equation 2A. This is because both equations use the same
sample. Notice also that this model does not fit the data quit as well
as Equation 2A as indicated by the AIC, Schwartz Criterion, and adjusted
R squared. Adding the STATS_GPA variable as in Equation 2A improves the
model for this sample. Equation 1D uses the sub-sample of students who
have not taken a statistics course. The variables that are significant
here are also those that are significant in Equation 1A. Reviewing
Equations 1C and 1D together with Equations 1A and 2A indicates that for
those students who have taken a statistics course, better performance in
the statistics course relates to better performance in the introductory
finance course; for those students who have not taken a statistics
course, more math courses and the more recent the last accounting course
was taken results in better performance in the introductory finance
course.
CONCLUSION
As in Didia and Hasnat (1998) cumulative GPA has been found to
contribute significantly to a student's performance in the
principles of finance class. This research identifies the quantity of
math classes taken, the age of a student's last accounting class,
and the GPA in a student's statistics classes as additional
determinates of performance. Of course, different instructors teach in
different ways, and what contributes to one instructor's students
may not contribute to another's. However, instructors and program
developers need to be aware that a student's performance in the
principles of finance course may be a function of such factors as the
timing and quantity of certain prerequisite courses, and not only the
GPA in those courses.
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Alan Blaylock, Murray State University
Stephen K. Lacewell, Murray State University
Table 1: Descriptive Statistics
Variable Mean Standard
Deviation
Semester average for the course (GRADE) 75.30 19.11
Number of males (GENDER) 35 --
Number of accounting majors (ACC_MAJOR) 11 --
Number of economics majors (ECON_MAJOR) 1 --
Number of finance majors (FIN_MAJOR) 8 --
Number of transfer students (TRANSFER) 42 --
Number of students that have taken 19 --
developmental math (DEVMATH)
Average GPA for all math courses taken
(at the college algebra level and above)
(MATH_GPA) 2.70 0.91
Number of semesters since a math course 7.19 6.58
was taken (MATH_AGE)
Number of math courses taken
(at the college algebra level and above)
(MATH_Q) 2.10 0.69
Average GPA for all economics courses taken 2.65 0.83
(ECON_GPA)
Number of semesters since an economics course 3.83 5.80
was taken (ECON_AGE)
Number of economics courses taken (ECON_Q) 2.45 0.58
Average GPA for all accounting courses taken 2.79 0.76
(ACC_GPA)
Number of semesters since an accounting 4.00 6.20
course was taken (ACC_AGE)
Number of accounting courses taken (ACC_Q) 2.04 0.67
Average GPA for all statistics courses taken 2.66 1.12
(STATS_GPA)
Number of semesters since a statistics course 3.14 5.30
was taken (STATS_AGE)
Number of statistics courses taken (STATS_Q) 1.36 0.51
Cumulative GPA (GPA) 2.80 0.60
Table 2: Correlation Coefficients Between the Variables
GENDER ACC_MAJOR ECON_MAJOR
GENDER 1.0000
ACC_MAJOR -0.1984 1.0000
ECON_MAJOR -0.0086 -0.0588 1.0000
FIN_MAJOR 0.0117 -0.0443 -0.0491
TRANSFER -0.0064 0.0621 -0.0359
DEVMATH -0.0910 -0.1150 -0.0695
MATH_GPA -0.0550 0.2770 0.1268
MATH_AGE -0.0320 0.1846 -0.0499
MATH_Q -0.0961 0.0243 0.0646
ECON_GPA 0.0445 0.2358 0.1807
ECON_AGE -0.0413 0.1368 -0.0068
ECON_Q -0.0914 -0.1045 0.0437
ACC_GPA -0.1091 0.3181 -0.0233
ACC_AGE -0.0034 0.0246 0.0046
ACC_Q -0.2072 0.3794 0.0902
STATS_GPA 0.0382 0.1611 -0.0264
STATS_AGE -0.2218 0.1683 0.0369
STATS_Q -0.1389 -0.0594 -0.0292
GPA -0.1047 0.2809 0.1094
FIN_MAJOR TRANSFER DEVMATH
GENDER
ACC_MAJOR
ECON_MAJOR
FIN_MAJOR 1.0000
TRANSFER 0.0913 1.0000
DEVMATH 0.0943 -0.0861 1.0000
MATH_GPA 0.1326 0.0120 -0.2928
MATH_AGE -0.0677 -0.1018 -0.1465
MATH_Q 0.0402 0.1040 0.1136
ECON_GPA -0.0546 -0.0070 -0.2123
ECON_AGE -0.0327 -0.1509 -0.0755
ECON_Q -0.1864 -0.0017 0.0338
ACC_GPA 0.1094 0.1711 -0.1600
ACC_AGE -0.1116 -0.0607 -0.0470
ACC_Q -0.0807 0.1582 -0.0360
STATS_GPA -0.0961 -0.1078 -0.0540
STATS_AGE 0.1103 -0.0436 -0.3967
STATS_Q -0.0990 -0.0334 0.0215
GPA 0.0623 -0.0266 -0.2365
MATH_GPA MATH_AGE MATH_Q
MATH_GPA 1.0000
MATH_AGE 0.0644 1.0000
MATH_Q 0.0638 -0.1307 1.0000
ECON_GPA 0.4565 0.0528 0.0578
ECON_AGE 0.0239 0.5423 -0.1123
ECON_Q -0.0897 0.1863 0.0471
ACC_GPA 0.3757 0.2189 -0.0632
ACC_AGE 0.0765 0.3281 0.0130
ACC_Q 0.0186 0.0524 -0.0763
STATS_GPA 0.1593 0.7091 -0.0766
STATS_AGE 0.4968 0.1558 -0.0088
STATS_Q -0.0559 0.0018 0.0834
GPA 0.6261 0.0504 -0.0493
ECON_GPA ECON_AGE ECON_Q
MATH_GPA
MATH_AGE
MATH_Q
ECON_GPA 1.0000
ECON_AGE 0.0697 1.0000
ECON_Q -0.1501 -0.0692 1.0000
ACC_GPA 0.4650 0.1359 -0.0530
ACC_AGE 0.1792 0.6117 0.0716
ACC_Q 0.0125 0.0817 0.0266
STATS_GPA 0.2219 0.7937 0.0739
STATS_AGE 0.5531 0.0120 -0.0456
STATS_Q -0.1269 -0.0034 0.2178
GPA 0.6694 0.0156 -0.0507
ACC_GPA ACC_AGE ACC_Q
ACC_GPA 1.0000
ACC_AGE 0.0835 1.0000
ACC_Q 0.1415 -0.0702 1.0000
STATS_GPA 0.1289 0.8469 -0.0801
STATS_AGE 0.4927 0.0273 -0.0290
STATS_Q -0.0379 0.1306 0.0594
GPA 0.5949 0.0773 0.0511
STATS_GPA STATS_AGE STATS_Q GPA
ACC_GPA
ACC_AGE
ACC_Q
STATS_GPA 1.0000
STATS_AGE 0.1217 1.0000
STATS_Q -0.1817 -0.0565 1.0000
GPA 0.2096 0.7397 -0.1196 1.0000
Table 3: Variance Inflation Factors
Equation 1A Equation 1B Equation 2A Equation 2B
MATH GPA 1.85 -- 2.31 --
MATH AGE 1.69 1.15 2.49 --
MATH_Q 1.14 1.04 1.39 --
ECON GPA 2.18 -- 3.14 2.24
ECON AGE 2.33 -- 6.38 --
ECON_Q 1.28 -- 1.19 --
ACC GPA 1.91 -- 2.21 --
ACC AGE 1.86 1.13 9.36 --
ACC_Q 1.33 -- 1.64 --
STATS GPA -- -- 2.92 2.21
STATS AGE -- -- 5.63 --
STATS_Q 1.15 -- 1.41 --
GPA 3.08 1.02 6.01 3.44
Table 4: OLS Results
The dependent variable is the final grade received in the course.
The t-values are presented in parentheses.
Independent Equation 1B
Variables Equation 1A ([dagger]) Equation 1C
13.862 15.9436 * 9.0852
C (1.3347) (1.7586) (0.4895)
-4.4924 -5.5130 ** -4.1738
GENDER (1.6307) (2.2936) (1.0235)
2.7105 2.122
ACC_MAJOR (0.6932) -- (0.3321)
1.0356 2.0602
ECON_MAJOR (0.0915) -- (0.1204)
0.2096 5.7957
FIN_MAJOR (0.0533) -- (0.8758)
-1.2258 1.9768
TRANSFER (0.4220) -- (0.4737)
3.2186 1.9786
DEVMATH (0.9977) -- (0.4022)
1.0504 -0.9445
MATH_GPA (0.5317) -- (0.3065)
0.2475 0.3145 *** 0.3426
Y (1.3831) (3.2456) (0.8571)
3.1775 * 3.3122 * 3.671
MATH_Q (1.8646) (1.9153) (1.2019)
-2.2232 -3.4389
ECON_GPA (0.9857) -- (0.8724)
0.2413 0.2322
ECON_AGE (0.7846) -- (0.2904)
-1.2427 1.2719
ECON_Q (0.5260) -- (0.3697)
1.9838 -0.372
ACC_GPA (0.8386) -- (0.1052)
-1.0226 *** -0.8208 * -0.7533
ACC_AGE (2.7338) (1.7632) (0.9605)
-2.7260 -2.7057
ACC_Q (1.2705) -- (0.7732)
STATS_GPA -- -- --
STATS_AGE -- -- --
2.6683
STATS_Q -1.4965 -- --
20.0260 *** 19.6745 *** 25.9684 ***
GPA (5.4172) (8.5420) (3.9331)
Adjusted [R.sup.2] 0.4101 0.4276 0.3627
F 6.6851 21.7686 3.4191
N 140 140 69
Akaiki Information
Criterion 8.3855 8.2778 8.4976
Scwartz Criterion 8.7637 8.4039 9.0480
Independent Equation 2B
Variables Equation 1D Equation 2A ([dagger])
23.8951 10.7505 26.5305 ***
C (1.5160) (0.6045) (3.0950)
-5.7301 -0.708
GENDER (1.3584) (0.1779) --
-1.8873 5.6129
ACC_MAJOR (0.3423) (0.9479) --
-7.2943 0.0836
ECON_MAJOR (0.4203) (0.0053) --
-4.7791 1.6759
FIN_MAJOR (0.8352) (0.2689) --
-7.1869 3.0257
TRANSFER (1.5441) (0.7880) --
3.9482 6.212
DEVMATH (0.7928) (1.3209) --
1.777 -0.8033
MATH_GPA (0.5557) (0.2842) --
0.2538 0.1464
MATH_AGE (1.1079) (0.3609) --
4.7826 * 1.5646
MATH_Q (1.9669) (0.5409) --
-0.8174 -4.1864 -5.8182
ECON_GPA (0.2664) (1.1572) (1.6241)
0.163 0.4881
ECON_AGE (0.4324) (0.6626) --
-3.6313 1.4322
ECON_Q (0.8931) (0.4517) --
2.8819 -1.904
ACC_GPA (0.7616) (0.5758) --
-2.8835*** -0.3391
ACC_AGE (2.9794) (0.4060) --
-0.4594 -1.4706
ACC_Q (0.1397) (0.4568) --
9.0958 *** 8.5344 ***
STATS_GPA -- (3.5219) (3.4837)
-0.5006
STATS_AGE -- (0.6608) --
3.182
STATS_Q -- (0.8150) --
18.2497 *** 16.3821 ** 14.8288 ***
GPA (3.3605) (2.3821) (2.8214)
Adjusted [R.sup.2] 0.5623 0.4673 0.5424
F 4.1448 4.1397 27.8687
N 69 69 69
Akaiki Information
Criterion 8.5387 8.3459 8.0127
Scwartz Criterion 9.0891 8.9934 8.1422
([dagger]) indicates that White's corrected standard errors were used
due to the detection of heteroskedasticity.
*** Significance at the 0.01 level.
** Significance at the 0.05 level.
* Significance at the 0.10 level.