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Design effect [message #3427] Wed, 10 December 2014 06:05 Go to next message
awah is currently offline  awah
Messages: 2
Registered: December 2014
Location: Sweden
Member
Hi,

I am a PhD student working in the field of female genital cutting (FGC).
We are planning a cluster randomized intervention study to investigate knowledge, attitudes and practice of FGC.

For the sample size calculation we need to estimate the design effect (or the intracluster correlation coefficient).
I have found that DHS publish design effect for some of the questions used in the questionnaire. But I have not found this reported for the questions in the Female Genital Cutting Model.
Is this information available somewhere?

Much grateful for an answer!

Re: Design effect [message #3429 is a reply to message #3427] Wed, 10 December 2014 10:20 Go to previous messageGo to next message
Sarah-DHS is currently offline  Sarah-DHS
Messages: 47
Registered: February 2013
Member
Dear awah,

Here is a response from Senior Sampling Statistician Dr. Rulin Ren:
It is true that we never reported the CI for the FGC in the DHS final report, so there is no estimate of the design effect. But I guess it is an indicator with high intra-cluster correlation because it is culture related. Our rule of thumb is that if you do not know the design effect of specific DHS indicator, take it as 1.5 because this is the average value for DHS indicators. Please note that we use Deft, which is the square root of Deff.

Thank you,
Sarah-DHS
Re: Design effect [message #3448 is a reply to message #3429] Fri, 12 December 2014 04:25 Go to previous messageGo to next message
awah is currently offline  awah
Messages: 2
Registered: December 2014
Location: Sweden
Member
Thank you very much for your response.

Could you please just specify if your rule of thumb refers to Deff=1.5 or Deft=1.5?

Re: Design effect [message #3450 is a reply to message #3448] Fri, 12 December 2014 09:08 Go to previous messageGo to next message
Sarah-DHS is currently offline  Sarah-DHS
Messages: 47
Registered: February 2013
Member
Dear Awah,

From Dr. Ruilin Ren:

Since we always use Deft, so our rule of thumb is Deft=1.5.

Thanks,
Sarah-DHS
Re: Design effect [message #14800 is a reply to message #3450] Mon, 07 May 2018 03:04 Go to previous message
sadya2018@gmail.com
Messages: 91
Registered: April 2018
Location: Ethiopia, in Africa
Senior Member
Thank you very much!!

Hassen Ali Hamza (BSc in Public Health,Master of Public Health Candidate)
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