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decus_20tap1_198111
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decus/20-0020/stat03.sta
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100' NAME--STAT03
110'
120' DESCRIPTION--COMPUTES THE MEANS, VARIANCES, AND T-RATIO
130' FOR TWO GROUPS OF UNPAIRED DATA. THIS PROGRAM ASSUMES THAT THE
140' GROUPS MAY HAVE UNEQUAL VARIANCES
150'
160' SOURCE--UNKNOWN
170'
180' INSTRUCTIONS--PUT DATA IN LINE 900 AND FOLLOWING.
190' MAKE SURE THE DATA LINE NUMBERS DO NOT EXCEED 919.
200' END THE FIRST SERIES OF DATA WITH 999999, AND THEN
210' TYPE IN THE SECOND SERIES,AGAIN ENDING WITH 999999.
220' SAMPLE DATA ARE IN LINES 900 AND 910.
230'
240'
250' * * * * * * * MAIN PROGRAM * * * * * * * * * * *
260'
270 LET P = 1
280 LET S = 0
290 LET S2 = 0
300 LET N = 0
310 READ X
320 IF X = 999999 THEN 370
330 LET S = S + X
340 LET S2 = S2 + X*X
350 LET N = N + 1
360 GO TO 310
370 LET S(P) = S
380 LET Z(P) = S2
390 LET N(P) = N
400 IF P = 2 THEN 430
410 LET P = 2
420 GO TO 280
430 REM NOW WE PRINT THE ANSWERS
440 PRINT "GROUP", "NUMBER", "MEAN", "VARIANCE", "STD. DEV."
450 PRINT
460 FOR I = 1 TO 2
470 LET M(I) = S(I)/N(I)
480 LET V(I) = (N(I)*Z(I) - S(I)*S(I))/N(I)/(N(I) - 1)
490 LET D(I) = SQR(V(I))
500 PRINT I, N(I), M(I), V(I), D(I)
510 NEXT I
520 LET Q = V(1) / N(1) + V(2) / N(2)
530 LET W = SQR(Q)
540 LET R = M(1) - M(2)
550 LET K = V(1) / N(1) / Q
560 LET D = 1/( K*K/(N(1) - 1) + (1-K)*(1-K)/(N(2) - 1) )
570 PRINT
580 PRINT "MEAN DIFF.", "VAR. DIFF.", "STD. DEV. DIFF."
590 PRINT R, Q, W
600 PRINT
610 PRINT "T RATIO", R/W , "ON"; D;"DEGREES OF FREEDOM."
620 STOP
900 DATA 160, 160, 140, 190, 999999
910 DATA 117, 145, 147, 120, 150, 120, 999999
920 END