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Re: weights for ttest [message #1675 is a reply to message #1674]

Wed, 26 March 2014 17:59

Reduced-For(u)m
Messages: 292
Registered: March 2013

Senior Member

Here's one option. Append the two files together. Make separate strata/PSU variables for each survey, and a dummy variable indicating the later survey. Then:

svy: reg HIVOutcome Survey2011

The coefficient on Survey2011 should be the thing you are interested in, assuming you have a continuous measure of some sort. If you want to compare categories it gets a bit trickier, but basically by appending the surveys and using a regression with a dummy for later survey you should be able to use weights and appropriate standard error calculations.

*Note: there is some disagreement here about how to use weights in multiple survey rounds. Weights as given sum to sample size, so I usually standardize weights by survey round (divide the given weight by the sum of weights for that survey round) so that each survey has equal total weight, but that is a preference and shouldn't matter too much.

That sufficient?

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[Message index]

		weights for ttest By: MissFay on Wed, 26 March 2014 17:08
		Re: weights for ttest By: Reduced-For(u)m on Wed, 26 March 2014 17:59
		Re: weights for ttest By: Liz-DHS on Thu, 27 March 2014 14:56
		Re: weights for ttest By: Reduced-For(u)m on Thu, 27 March 2014 16:40
		Re: weights for ttest By: Sarah B on Tue, 14 April 2015 14:45

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