# Weighting of data

*This page is a part of PSPP Guide.*

Weighting is a procedure which can give some cases more or less influence (weight) on the result than other cases have in the same data set. We use weights in case of over- or under-represented units in our sample. For instance, if we know, that there is 51% female in the population, and we have only 49% of female in our sample, we can give female respondents in our sample more influence by computing a weight (which is larger than 1 in our case, actually is 51/49 = 1.040816327). We can compute weights by compute command.

To weight cases, go to *Data – Weight Cases*, select weight variable and click OK. In the status bar of data editor is displayed information if cases are weighted and by which variable.

Similarly weights can be turned off.

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