If you specify a CONTROL statement, PROC SURVEYSELECT sorts the input data set by the CONTROL variables before selecting the sample. If you also specify a STRATA statement, the procedure sorts by ...
In science, a variable is something that can be changed, measured or controlled in an experiment. Scientists look at variables to understand how they affect things. A variable is any one of the things ...
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Why no country has ever conducted a pure economic experiment
Economics often borrows ideas from the sciences, yet unlike physics or chemistry, no country has ever run a controlled, pure economic experiment on a national scale. A pure experiment requires ...
Volumetric flow, flow velocity and temperature measurement – three of the most important variables which help to ensure efficient process control. So, wouldn’t it be convenient if you could measure ...
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