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Using continuous surveys [message #16347] Tue, 18 December 2018 14:40 Go to next message
srhayford is currently offline  srhayford
Messages: 3
Registered: October 2016
Member
I'm planning to use data from Senegal to analyze FGMC. I am trying to figure out whether it would be more appropriate to use a single year of data or to use pooled data from multiple years of the continuous surveys. I have found some documentation that suggests that the single-year samples are not representative at the regional level (https://dhsprogram.com/pubs/pdf/DM34/DM34.pdf). According to this documentation, it seems like data should be pooled if regional estimates are needed. However, it is not clear what years can be pooled - the pdf suggests combining 2016 and 2017, but the website for downloading the data pools 2015 and 2016.

(I'm not planning to do any analysis of change over time, so the time period covered doesn't matter to me.)

I have a few questions.

1. Can you point me to some more complete/technical documentation about the sampling strategy and what samples are representative at what level?
2. How should the weights be treated when pooling multiple years? Does the pooled download (2015 & 2016) include appropriate weights for the pooled sample, or do they need to be adjusted somehow?
3. I see from reading the forums that the wealth quintiles need to be adjusted when pooling data (since they are quintiled relative to the individual year samples). Does the pooled download include wealth quintiles for the pooled sample or within-sample quintiles?

Thanks
Sarah


Sarah Hayford
Ohio State University
Re: Using continuous surveys [message #16385 is a reply to message #16347] Thu, 03 January 2019 18:15 Go to previous messageGo to next message
Bridgette-DHS is currently offline  Bridgette-DHS
Messages: 1667
Registered: February 2013
Senior Member


Following is a response from Senior Sampling Statistician, Ruilin Ren:

The Senegal continuous DHS had been modified a little in the course of the survey to incorporate needed changes. The document you cited reflects the initial design of the survey but did not integrate the modifications in the course of the survey. Actually the survey was continuous from 2013 to 2016, with the 2013 and 2014 surveys based on previous population census (2002), while the 2015 and 2016 survey were based on the new population census (2013). The main difference was the definition of urban-rural. So it is advised that you can combine the 2013-2014 surveys together, and 2015-2016 surveys together. ICF already released the pooled data sets with combined weights calculated for 2013-2014 and 2015-2016, so you do not need to do anything on the weights if you use the pooled data released by ICF. However, the 2017 survey was a standalone survey with designed representative results for each of the 14 regions.

As for the wealth quintile for the pooled data, I only know it was not recalculated based on the pooled data, but through a specific procedure. I do not have all the details. If you need the details, please let us know and we will direct the question to the appropriate expert from ICF.

Re: Using continuous surveys [message #16386 is a reply to message #16385] Thu, 03 January 2019 20:42 Go to previous messageGo to next message
srhayford is currently offline  srhayford
Messages: 3
Registered: October 2016
Member
Thank you, this is very helpful!

Sarah Hayford
Ohio State University
Re: Using continuous surveys [message #18001 is a reply to message #16385] Tue, 13 August 2019 06:46 Go to previous message
anarinaldi is currently offline  anarinaldi
Messages: 11
Registered: December 2016
Location: Uberlandia - Brazil
Member
Hello:

I am planning to use Peru continuous DHS. Which survey years I need to combine since 2004? After I put together the datasets, is it necessary to recalculte the weights?
Thank you so much,
Ana Elisa
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