SUBROUTINE LOGCDF(X,CDF)
C
C     PURPOSE--THIS SUBROUTINE COMPUTES THE CUMULATIVE DISTRIBUTION
C              FUNCTION VALUE FOR THE LOGISTIC DISTRIBUTION 
C              WITH MEAN = 0 AND STANDARD DEVIATION = PI/SQRT(3).
C              THIS DISTRIBUTION IS DEFINED FOR ALL X AND HAS
C              THE PROBABILITY DENSITY FUNCTION
C              F(X) = EXP(X)/(1+EXP(X)).
C     INPUT  ARGUMENTS--X      = THE SINGLE PRECISION VALUE AT
C                                WHICH THE CUMULATIVE DISTRIBUTION
C                                FUNCTION IS TO BE EVALUATED.
C     OUTPUT ARGUMENTS--CDF    = THE SINGLE PRECISION CUMULATIVE
C                                DISTRIBUTION FUNCTION VALUE.
C     OUTPUT--THE SINGLE PRECISION CUMULATIVE DISTRIBUTION
C             FUNCTION VALUE CDF.
C     PRINTING--NONE.
C     RESTRICTIONS--NONE.
C     OTHER DATAPAC   SUBROUTINES NEEDED--NONE.
C     FORTRAN LIBRARY SUBROUTINES NEEDED--EXP.
C     MODE OF INTERNAL OPERATIONS--SINGLE PRECISION.
C     LANGUAGE--ANSI FORTRAN. 
C     REFERENCES--JOHNSON AND KOTZ, CONTINUOUS UNIVARIATE
C                 DISTRIBUTIONS--2, 1970, PAGES 1-21.
C     WRITTEN BY--JAMES J. FILLIBEN
C                 STATISTICAL ENGINEERING LABORATORY (205.03)
C                 NATIONAL BUREAU OF STANDARDS
C                 WASHINGTON, D. C. 20234
C                 PHONE:  301-921-2315
C     ORIGINAL VERSION--JUNE      1972. 
C     UPDATED         --MAY       1974. 
C     UPDATED         --SEPTEMBER 1975. 
C     UPDATED         --NOVEMBER  1975. 
C
C---------------------------------------------------------------------
C
      IPR=6
C
C     CHECK THE INPUT ARGUMENTS FOR ERRORS.
C     NO INPUT ARGUMENT ERRORS POSSIBLE 
C     FOR THIS DISTRIBUTION.
C
C-----START POINT-----------------------------------------------------
C
      IF(X.GE.0.0)GOTO150
      CDF=EXP(X)/(1.0+EXP(X)) 
      RETURN
  150 CDF=1.0/(1.0+EXP(-X))
      RETURN
C
      END