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Senegal continuous DHS  combine 2014 and 2015 for regional representability? [message #12559] 
Thu, 15 June 2017 08:03 
fcavallaro
Messages: 17 Registered: October 2015 Location: London, UK

Member 


Hello,
I am working with the Senegal DHS and would like to produce recent regionally representative estimates. I am aware the 201213 and 2014 surveys are individually representative at the zonal level, and combined are additionally representative at the regional level. When combining these, can the wealth quintiles be used as they are, or would they need to be recalculate on the combined sample?
Second, is it at all possible to combine 2014 and 2015 surveys to obtain regionally representative estimates? Or can the 2015 survey only be grouped with the 2016 survey?
Many thanks,
Francesca





Re: Senegal continuous DHS  combine 2014 and 2015 for regional representability? [message #12741 is a reply to message #12710] 
Thu, 06 July 2017 10:36 
BridgetteDHS
Messages: 1504 Registered: February 2013

Senior Member 


Following is a response from Senior DHS Specialists, Tom Pullum and Shea Rutstein:
There are a couple of ways to approach this: 1) use the 2014 mean and distribution for each of the wealth index component variables to calculate zscores for the 2015 variables, multiply each by the 2014 factor score (PCA) coefficients and sum to get each 2015 household's wealth score. This should be done for the total, the urban and the rural wealth scores. Use the regression equations from 2014 to then calculate the combined wealth score for 2015. Then pool the data together and determine the quintiles for the pooled data set. Of course, this procedure requires the same set of variables in each survey. 2) pool the data and then recalculate the wealth index, also with the same variables of the wealth index. The first is easier since it is basically a couple of recode statements (albeit long ones) with no rerunning of PCAs and combining regressions.



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