Date: Mon, 14 Jan 2002 14:45:35 -0600
Reply-To: Randy Richter <richterrr@SLU.EDU>
Sender: "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From: Randy Richter <richterrr@SLU.EDU>
Organization: Saint Louis University
Subject: Stratified random sample question
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A colleague and I are planning to survey physical therapists who belong
to our professional organization and practice in different settings.
The settings represent strata. We are planning on drawing a simple
random sample from each of four strata (work settings). Roughly equal
numbers will be drawn from each strata. In the actual population, the
strata differ in size by about 5%. Due to budget constraints and our
tolerance, we plan on margin of error of +/- 7%.
My question is: Does the sampling method proposed require that I use
weighting when analyzing the data between strata? For example, if the
final sample size for each strata is about equal and we use a a
chi-square analysis to examine responses between the strata should we
use a a weighting procedure? If so, how would the weights be
determined? Any references, or books on sampling that provide a clear
explanation of the issues involved are appreciated.
Thanks in advance.