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SHORT-T.DOC
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1988-07-24
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SHORT-T (Student's T-test, short version)
If you already know the mean, variance and N of two groups, it is not
necessary to type in all the individual numbers to run a T-test. This
program does the entire test based on these three measurements.
EXAMPLE: Data is the same as for the long version of the T-test, as
follows:
GROUP 1 GROUP 2
VARIANCE 0.110 0.10635
MEAN 1.137 1.325
N 10 1O
The only caution that need be observed is that the group with the LARGEST
variance must be Group 1, when entering the data. All of the tests are the
same as in the long version of the T-test. That is, an F-test is first
applied, and different methods are used to compute the T value based on the
results of the F-test. Both an exact P-value and statements concerning
significance are printed out.
Data can be entered either directly from the keyboard, or via a WordStar
non-document file. The file format is as shown below:
Short-T test data from file <-- Title, up to 65 characters of any kind.
0.110 0.10635 <-- *Variance 1, variance 2.
1.137 1.325 <-- Mean 1, mean 2.
10 10 <-- N1, N2.
* Variance 1 MUST BE the larger variance.
REFERENCE: Mather, K. 1951 Statistical Analysis in Biology. Methuen and
Company, Ltd., London. Pages 56-57.
FORTRAN VERSION: Dr. Stanley Kaplan May 65
BASIC VERSION: Dr. Stanley Kaplan Jan 82
PASCAL VERSION: Dr. Stanley Kaplan Sep 85
UPDATES: Oct 86 (Version 2.00)
Feb 87 (Version 2.10)
Feb 88 (MS-DOS Version 2.2)