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SUBROUTINE TWOAV

PURPOSE
   TEST WHETHER A NUMBER OF SAMPLES ARE FROM THE SAME
   POPULATION BY THE FRIEDMAN TWO-WAY ANALYSIS OF VARIANCE TEST

USAGE
   CALL TWOAV(A,R,N,M,W,XR,NDF,NR)

DESCRIPTION OF PARAMETERS
   A   - INPUT MATRIX, N BY M, OF ORIGINAL DATA
   R   - OUTPUT MATRIX, N BY M, OF RANKED DATA
   N   - NUMBER OF GROUPS
   M   - NUMBER OF CASES IN EACH GROUP
   W   - WORK AREA OF LENGTH 2*M
   XR  - FRIEDMAN STATISTIC (OUTPUT)
   NDF - NUMBER OF DEGREES OF FREEDOM (OUTPUT)
   NR  - CODE, 0 FOR UNRANKED DATA IN A, 1 FOR RANKED DATA
	 IN A (INPUT)

REMARKS
   NONE

SUBROUTINES AND FUNCTION SUBPROGRAMS REQUIRED
   RANK

METHOD
   DESCRIBED IN S. SIEGEL, 'NONPARAMETRIC STATISTICS FOR THE
   BEHAVIORAL SCIENCES', MCGRAW-HILL, NEW YORK, 1956,
   CHAPTER 7