The DHS Program User Forum      
Discussions regarding The DHS Program data and results
Home » Data » Sampling » calculating sample size for two-stage sample
calculating sample size for two-stage sample [message #9863] Wed, 01 June 2016 14:44 Go to next message
aina2233 is currently offline  aina2233
Messages: 1
Registered: June 2016
Location: ?????????
I am reading the DHS Sampling and Household Listing Manual (published in Sept.2012, ICF International, Calverton, Maryland USA). I got confused from page 10 (reading in Word the Manual), chapter 1.6.2. Sample Size Determination. Since I want to achieve the results, provided in the table below on that page, using the provided formula for calculating sample size, and I can't get the identical results:
n = Deft2 x (1/P-1/divided by a2
/ (Ri x Rh x d)

and the values are in the manuals'table as copied below. For calculating sample size n for RSE 0.10 I am multiplying 1,4 squared x (1/0,2 - 1) /
0,1 squared / (0.96 x 0.92 x 1,05)

and cannot get to the same number as in the table (846) . I used also half of RSE 0.05 squared, but can't get the same number 846. If you can help me, what I am doing wrong? Since I want to be confident in using formula for sample size calculation (intended for two-stage sample).

From Manual's Table:
Estimated proportion p 0.20 Total target population (blank)
Estimated design effect (Deft) 1.40 # of target individuals/HH 1.05
Individual response rate 0.96 HH gross response rate 0.92
Desired Net Sample Sample size Expected 95% confidence limits
RSE size individual Household SE Lower Upper
0.12 544 587 0.024 0.152 0.248
0.11 648 699 0.022 0.156 0.244
0.10 784 846 0.020 0.160 0.240
0.05 3136 3382 0.010 0.180 0.220

[Updated on: Wed, 01 June 2016 14:46]

Report message to a moderator

Re: calculating sample size for two-stage sample [message #9887 is a reply to message #9863] Fri, 03 June 2016 12:59 Go to previous message
Bridgette-DHS is currently offline  Bridgette-DHS
Messages: 1262
Registered: February 2013
Senior Member
A team member has responded to you directly, using the email you provided on the forum.

Previous Topic: Clustering
Next Topic: What is the DHS position on the use of cluster-level data?
Goto Forum:

Current Time: Sat Mar 17 12:24:48 Eastern Daylight Time 2018