The required POPULATION statement specifies the information in the study data set. You can specify the following options in the POPULATION statement:

EVENT=variable

specifies the variable for the number of events in the study data set.

GROUP <( ORDER=DATA  FORMATTED  INTERNAL )> =variable

specifies the variable whose values identify the various populations. This option is required when METHOD=MH and also applies when METHOD=DIRECT
in the PROC STDRATE statement.
The optional ORDER= suboption specifies the order in which the values of the variable are to be displayed. You can specify the following values for the ORDER= suboption:
 DATA

sorts by the order in which the values appear in the input data set.
 FORMATTED

sorts by their external formatted values.
 INTERNAL

sorts by the unformatted values, which yields the same order that the SORT procedure does.
By default, ORDER=INTERNAL. For ORDER=FORMATTED and ORDER=INTERNAL, the sort order is machinedependent.

POPEVENT=number

specifies the total number of events in the study data set. This option applies only when METHOD=INDIRECT is specified in
the PROC STDRATE statement and the total number of events is not available in the study data set.

RATE <( MULT=c )> = variable

specifies the variable for the observed rate in the study data set. This option applies only when STAT=RATE is specified in the PROC STDRATE statement.
The MULT=c suboption specifies a power of 10 constant c and requests that the rates per c populationtime units be read from the data set. The default is the value of the MULT= suboption used in the STAT=RATE option
in the PROC STDRATE statement.

RISK=variable

specifies the variable for the observed risk in the study data set. This option applies only when STAT=RISK is specified in the PROC STDRATE statement.

TOTAL=variable

specifies the variable for either the populationtime (STAT=RATE) or the number of observations (STAT=RISK) in the study data set.
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