Appendix K
Weights (deprecated)
A WEIGHT question calculates a weighting scheme based on the known marginal distribution of some variables, using the rim weighting algorithm initially proposed by Deming and Stephan (W. Edwards Deming and Frederick F. Stephan, "On a Least Squares Adjustment of a Sampled Frequency Table When the Expected Marginal Totals are Known", The Annals of Mathematical Statistics, volume 11, number 4, December 1940, pp. 427-444). This weighting scheme is stored in the open-end part of the WEIGHT variable; it can be extracted or used in cwfreq to create weighted frequency tables.
Weighting instructions are placed in the question text segment of the question. Each weighting question is listed followed by the weight for each value of the question separated by slashes and ordered according to the numerical list of categories. Questions are separated by commas. Here is an example of the syntax:
QWEIGHT WEIGHT%QSEX=0.5/0.5/0QLANGUAGE = 0.80 / 0.08 / 0.12 / 0 / 0
Weight calculation supports the following (cwnav) options:
The following rules are enforced:
Weights are calculated in cwnav by selecting from the WEIGHT variable list shown after the write-access password is entered.
Weights are used in cwfreq by selecting from the WEIGHT variable list offered.