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 ...
When conducting surveys, two kinds of nonresponse may cause incomplete data files: unit nonresponse (complete nonresponse) and item nonresponse (partial nonresponse). The selectivity of the unit ...
A method is presented to increase precision or reduce expense in regression experiments by partly replacing expensive observations on the variable of interest by cheaper observations on a concomitant ...
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