Hi everyone,
I got a basic question I can't quite wrap my head around.
The following values for occurrences from a table:
Group 1 average 60% (n=150 from 250 cases)
Group 2 average 53.93% (n=192 out of 356 valid cases)
Total average is ~56.4% (n=342 of 606)
As there are different sample sizes, weighted average applies which however is = 56.59
What am I missing? Where is the .2 difference coming from? As I gather it, they should be exactly the same, with the weighted average having the advantage not to be dependent of the number of cases/totals, being calculated just with in-group occurrences times means.
Thanks,
statcat
I got a basic question I can't quite wrap my head around.
The following values for occurrences from a table:
Group 1 average 60% (n=150 from 250 cases)
Group 2 average 53.93% (n=192 out of 356 valid cases)
Total average is ~56.4% (n=342 of 606)
As there are different sample sizes, weighted average applies which however is = 56.59
What am I missing? Where is the .2 difference coming from? As I gather it, they should be exactly the same, with the weighted average having the advantage not to be dependent of the number of cases/totals, being calculated just with in-group occurrences times means.
Thanks,
statcat
Last edited: