The SURVEYREG Procedure

Domain Analysis

A DOMAIN statement requests that the procedure perform regression analysis for each domain.

For a domain D, let $I_ D$ be the corresponding indicator variable:

\[ I_{D}(h,i,j) = \left\{ \begin{array}{ll} 1 & \mbox{if observation }(h,i,j) \mbox{belongs to domain } D \\ 0 & \mbox{otherwise} \end{array} \right. \]

Let

\[ v_{hij} = w_{hij}I_ D(h,i,j) = \left\{ \begin{array}{ll} w_{hij} & \mbox{if observation } (h,i,j) \mbox{ belongs to domain } D \\ 0 & \mbox{otherwise} \end{array} \right. \]

The regression in domain D uses v as the weight variable.