Subset Rows with
Enter an S-PLUS expression that identifies the rows to use in the analysis. To use all the rows in the data set, leave this field blank. The expression must evaluate to a vector of logical values (TRUE values are used, FALSE values are dropped), or a vector of indices identifying the numbers of the rows to use.
Examples:
Species == 'bear' only bears are used.
1:20 only the first 20 rows of the data are used.
Age >= 13 & Age < 20 only teenagers are used.
For more information on constructing logical expressions see the Programmer's Guide.