Create a systematic sample from an existing SysFrame

Creates a systematic sample from a SysFrame for a specified starting position and sampling interval. Typically used to conduct variance assessments, e.g. as a part of compare_estimators().

subsample(object, start_pos, a)

Arguments

object	A SysFrame from which to sample
start_pos	A numeric vector of two elements indicating the starting position
a	The sampling interval

Value

A new SysFrame object that contains only the sampled elements