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.