Wednesday, October 26, 2005

Income deciles

Question

A faculty member here wants data from both SLID and SHS by income decile (not quintile, as has already been provided for us in SHS 2003). I know that I can use SPSS to generate the deciles, using

FREQUENCIES
VARIABLES=variable
/NTILES= 10
/ORDER= ANALYSIS.

and then, by using these figures to derive another variable, do crosstabs by income decile. What I'm not sure about is whether I
should calculate the deciles to create the derived variable before or after applying the weight variable. Could someone out
there give me some advice?

Answer

If you want the decile variable to indicate membership in the weighted sample, keep the weight variable on when calculating the deciles using the Frequencies command. To satisfy your curiosity, run the Frequencies command with the weight variable on and then off and compare the differences between the deciles of these two runs. You should see differences between the values of the deciles as a result of the sampling design.

When recoding income into deciles, the weight variable will not be invoked and can be either on or off.

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