The DHS Program User Forum
Discussions regarding The DHS Program data and results
Home » Topics » General » Trend analysis with different number of 'PSU' and 'Strata'
Re: Trend analysis with different number of 'PSU' and 'Strata' [message #24602 is a reply to message #24590] Mon, 06 June 2022 16:16 Go to previous messageGo to previous message
Janet-DHS is currently offline  Janet-DHS
Messages: 393
Registered: April 2022
Senior Member
Following is a response from DHS Research & Data Analysis Director, Tom Pullum:

You are correct. Two means (or proportions) can be significantly different even if the confidence intervals overlap. The reason for this is that the standard error of a difference is less than the sum of the two standard errors (the widths of the confidence intervals are proportional to the standard errors). In most situations, the standard error of a difference is equal to the square root of the sum of the squares of the two standard errors. It's like a right triangle, in which the hypotenuse is always shorter than the sum of the other two sides. Check a statistics text on tests and confidence intervals for a difference.

Report message to a moderator

[Message index]
 
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Previous Topic: Creating members sleeping per room
Next Topic: Multilevel modeling
Goto Forum:
  

[ Syndicate this forum (XML) ] [ RSS ] [ PDF ]

Current Time: Wed Jun 7 12:43:25 Coordinated Universal Time 2023
.:: Contact :: Home :: Privacy Policy ::.

Powered by: FUDforum 3.0.9.
Copyright ©2001-2018 FUDforum Bulletin Board Software

The information provided on this Web site is not official U.S. Government information and
does not represent the views or positions of the U.S. Agency for International Development or the U.S. Government.