CALL SEQUENCE...
       vbasd  VBIAS SD OUTPUT
 
 
      AUTHOR  - F. Zwiers, Jan 25/1985
      LAST REVISION: $Header: Correction-a-la-doc-pour-la-taille-des-echantillons @ 2018-03-26 17:16:00 -0400 (dugas) $
 
 
 
      PURPOSE - COMPUTES AN ESTIMATE OF POPULATION STANDARD
                DEVIATION FROM THE MEAN SQUARED DEVIATION.
 
 
      INPUT FILE...
       VBIAS  = FILE OF GRIDS OR ZONAL PROFILES OF BIASED ESTIMATES OF
                VARIANCE ( SUMS OF SQUARED DEVIATIONS DIVIDED BY N ).
                IT IS ASSUMED THAT N IS OBTAINED FROM WORD 2 OF THE
                RECORD LABEL OR FROM THE INTERNAL FILE DESCRIPTORS,
                DEPENDING ON THE VBIAS FILE TYPE.
 
      OUTPUT FILE...
       SD     = FILE OF GRIDS OR ZONAL PROFILES OF SQUARE ROOTS OF
                UNBIASED ESTIMATES OF THE VARIANCE (IE, THE SQUARE ROOT
                OF THE SUM OF SQUARED DEVIATIONS DIVIDED BY N-1)
 
 
      EXIT CONDITIONS...
        0 NO PROBLEMS
        1 UNABLE TO READ FIRST SET
        2 MORE THAN ONE SIZE IN VBIAS
        3 FOUND TOO SMALL A VALUE OF N