CALL SEQUENCE...
       critt  TC INPUT OUTPUT [-a VAL1 -b VAL2 -c VAL3]
 
 
      DESCRIPTION...
       critt  - COMPUTES THE CRITICAL VALUE FOR THE STUDENT-T TEST
 
 
      AUTHOR  - M.Lazare, November 16 1982.
      LAST REVISION: $Header: /home/cvs/RMNLIB/utils/rdiag/lspgm/critt.ptn,v 4.3 2014/09/25 20:20:46 dugas Exp $
 
 
      PURPOSE - COMPUTES THE CRITICAL VALUE OF THE STANDARD SIGNIFICANCE
                (STUDENT-T) TEST FOR 2 POOLED DATA SETS,  FOR A GIVEN
                LEVEL OF THE TEST , AND FOR CERTAIN SAMPLE SIZES OF
                CONTROL AND EXPERIMENT.
 
 
      OUTPUT FILE...
       TC = CARD IMAGE FILE OF CRITICAL VALUE IN THE PROPER FORMAT
            TO BE READ BY THE PROGRAM XLIN.
  
 
      INPUT PARAMETERS...
 
       ALFA (a) = SIGNIFICANCE LEVEL (THE SUPPORTED VALUES ARE .01,
                  .05 AND .10, WHICH CORRESPOND RESPECTIVELY TO 99%,
                  95% AND 90% CONFIDENCE LEVELS)
       RM   (b) = SAMPLE SIZE OF THE EXPERIMENT
       RN   (c) = SAMPLE SIZE OF THE CONTROL RUN
 
       NOTES: 1) IF THE NUMBER OF DEGREES OF FREEDOM (DF = RM+RN-2)
                 IS .LE. 30, EXACT CRITICAL VALUES ARE PROVIDED.
              2) FOR DF IN THE...
                  ]30, 40] RANGE, CRITICAL VALUES FOR  40 ARE GIVEN;
                  ]40, 60] RANGE, CRITICAL VALUES FOR  60 ARE GIVEN;
                  ]60,120] RANGE, CRITICAL VALUES FOR 120 ARE GIVEN;
              3) FOR DF VALUES GREATER THAN 120, THE ASYMPTOTIC
                 CRITICAL VALUES AT INFINITY ARE GIVEN.
 
       READ(5,5000) ALFA,RM,RN
 5000  FORMAT(10X,3E10.0) 
 
 
      EXAMPLE OF INPUT CARD...
 
 *CRITT         0.05        1.        5.
 
         0123456789012345678901234567890123456789012345678901234567890
         1         2         3         4         5         6         7
 
 
      EXIT CONDITIONS...
        0 NO PROBLEMS
        1 UNSUPPORTED VALUES OF ALFA
        2 RM+RN-2 SMALLER THAN 1
        3 ERRORS WHILE READING PARAMETRES