Treats observations as if they appear multiple times in the input
data set.
- variable
- specifies a numeric variable whose value represents the
frequency of the observation. If you use the WEIGHT statement, PROC FREQ assumes
that an observation represents n observations, where n is the value of variable. The
value of the weight variable need not be integer but when a value is missing
or zero, PROC FREQ ignores the corresponding observation. If a WEIGHT statement
does not appear, each observation has a default weight of 1. The sum of the
weight variable values represents the total number of observations.
If
any value of the weight variable is negative, PROC FREQ displays the frequencies
(as measured by the weighted values), but does not compute and display percentages
and other statistics. If you create an output data set using OUT= in the TABLES
statement, PROC FREQ creates the PERCENT variable and assigns a missing value
for each observation. PROC FREQ also assigns missing values to the variables
that the OUTEXPECT and OUTPCT options create. You cannot create an output
data set using the OUTPUT statement since statistics are not computed.
Copyright 1999 by SAS Institute Inc., Cary, NC, USA. All rights reserved.