# Sampling Wizard: Output Variables

This step allows you to choose variables to save when the sample is drawn.

**Population size.** The estimated number of units in the population for a given stage.
The rootname for the saved variable is *PopulationSize_*.

**Sample proportion.** The sampling rate at a given stage. The rootname for the saved variable
is *SamplingRate_*.

**Sample size.** The number of units drawn at a given stage. The rootname for the
saved variable is *SampleSize_*.

**Sample weight.** The inverse of the inclusion probabilities. The rootname for the
saved variable is *SampleWeight_*.

Some stagewise variables are generated automatically. These include:

**Inclusion probabilities.** The proportion of units drawn at a given stage. The rootname for
the saved variable is *InclusionProbability_*.

**Cumulative weight.** The cumulative sample weight over stages previous to and including
the current one. The rootname for the saved variable is *SampleWeightCumulative_*.

**Index.** Identifies units selected multiple times within a given stage. The
rootname for the saved variable is *Index_*.

*Note*:
Saved variable rootnames include an integer suffix that reflects the
stage number—for example, *PopulationSize_1_* for the saved population size for stage 1.