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Learner I
Answers
Macros are textual variables that can be set in a process or in the process context. You probably have a macro called fraction which contains a number like 0.5 to determine the sample fraction.
When you look at the Sample operator, it has a parameter called sample. Here you can select absolute, relative and probability sampling.
Absolute allows you to set the exact number of resulting rows.
Relative samples a ratio (or fraction) of the original data.
Probability selects each element of the incoming data with the specified probability, so the result will be about (but not exactly) the specified fraction of the data.
You just need to select the sampling method you need and enter the parameter value. Parameter values can be entered directly (e. g. 0.3) or with macros (e. g. %{fraction} ).
Regards,
Balázs