The DHS Program User Forum
Discussions regarding The DHS Program data and results
Home » Countries » Ethiopia » Do strata represent distinct geographic areas within the same region? (Stratum)
Do strata represent distinct geographic areas within the same region? [message #23007] Wed, 23 June 2021 10:41 Go to next message
aligazan
Messages: 24
Registered: June 2014
Location: UK
Member
Hello

I am looking at Ethiopia 2016, which has 25 stratification units or strata (V023).

In some regions there are two strata, just urban and rural. In other regions there are two or more rural strata. What I would like to know, is whether the individuals in each strata are from the same geographic area?
e.g. Are the individuals in Tigray/Urban from several towns and cities, or are they from one large city in Tigray?
e.g. Are the individuals in the three different urban strata in Oromia (nos. 9, 10 and 11) from three distinct rural areas in Oromia

If this is the case, it would be most helpful to see the different strata shown on a map. Do you know if such a map exists?

Many thanks
Janet
Re: Do strata represent distinct geographic areas within the same region? [message #23009 is a reply to message #23007] Wed, 23 June 2021 14:31 Go to previous messageGo to next message
Bridgette-DHS is currently offline  Bridgette-DHS
Messages: 2670
Registered: February 2013
Senior Member

Following is a response from DHS Senior Sampling Specialist, Mahmoud Elkasabi:

DHS surveys are based on stratified multi-stage sampling designs, where independent multi-stage samples are selected per strata. Within each stratum implicit stratification is applied to make sure that the selected primary sampling units are representing different geographic levels and areas. More details can be found in the DHS sampling manual. So regarding your question, "whether the individuals in each strata are from the same geographic area?", the answer is no; the sample is distributed over different geographic areas.

Regarding the Oromia example you mentioned, this was a special scenario, where we had to create 3 sub-strata within the rural-Oromia to deal with the huge size of that stratum (rural-Oromia).
Re: Do strata represent distinct geographic areas within the same region? [message #23011 is a reply to message #23009] Thu, 24 June 2021 04:16 Go to previous messageGo to next message
aligazan
Messages: 24
Registered: June 2014
Location: UK
Member
Thank you so much for your reply.

Yes, I have seen the guidance in DHS on how stratification units are selected, but I hope you don't mind if I ask for further clarification.

The individuals in each strata are from the same region, and of the same type (urban or rural). I have three questions;

1) Are the urban strata taken from a range of urban areas within the same region e.g. in the case of Ethiopia 2016, strata 3 is Afar Urban, and strata 4 is Afar Rural. Are the clusters/individuals in AFar Urban from a range of urban locations within Afar, or are they from one urban location etc.?

2) Where there are more than one rural strata in a region (in Ethiopia 2016 this is the case for Amhara, Oromia and SNNPR) how are the clusters/individuals within it located? Do these strata reflect the zones/districts within the region they are in?

3) In these areas where there are more than one rural strata in the region, if they are not divided geographically or by administrative boundaries e.g. by zones/districts, is there any other grouping or selection method used?

Thanks in advance,

Janet


Re: Do strata represent distinct geographic areas within the same region? [message #23012 is a reply to message #23011] Thu, 24 June 2021 14:53 Go to previous message
Bridgette-DHS is currently offline  Bridgette-DHS
Messages: 2670
Registered: February 2013
Senior Member
Dr. Elkasabi reviewed your post and has nothing to add to his previous response.
Previous Topic: Neonatal Mortality
Next Topic: Family Planning
Goto Forum:
  


Current Time: Sat Feb 4 01:24:38 Coordinated Universal Time 2023