05-18-2018 01:46 PM - edited 05-30-2018 07:17 PM
I have a single group with incidence pre and post some intervention. The populations are different pre and post but I am not sure how to account for this in my analysis.
05-18-2018 02:07 PM
What type of analysis are you actually attempting - research question to answer?
And some example data might help, replace anything sensitive with different values like xxxx, yyyy or similar.
05-18-2018 02:10 PM
Research question is: is the intervention effective in reducing the number of injuries?
I have data from 5 different counties, with the populations pre-intervention and post-intervention, along with the incidence of injuries pre and post intervention as well.
05-18-2018 06:51 PM
Do you want to know about each county or the data overall?
Is the population in the same data set as the incidence rate?
Do you have a variable that indicates whether a value is pre or post?
If you had posted some example data these questions would not be needed.
McNemar's test is sort of designed or a 2x2 table. is your data in form conducive to that? That would tend to look like
Pre count yes
pre count no
Post Count yes
Post count no
Also there are number of procedures that will do that test, or similar? Which one have you mind?
05-30-2018 02:38 PM
ID Time Count Total
1 pre 3 1200
1 post 5 1300
2 pre 0 1250
2 post 3 1310
I want to do by both county and overall. The event is very rare, I wondered if an exact poisson would be appropriate but we cannot use the repeated statement with an exact poisson. Any advice would be helpful.