The need comes from the PISA data. (http://www.pisa.oecd.org)
In the data there are many cases and each of them carries a numeric
variable that signifies it's weight.
In SPSS the command would be "WEIGHT BY"
In simpler words here is an R sample ( What is get VS what i want to get )
> data.recieved <- data.frame(
+ kindergarten_attendance = factor(c(2,1,1,1), labels = c("Yes", "No")),
+ weight=c(10, 1, 1, 1)
+ );
> data.recieved;
kindergarten_attendance weight
1 No 10
2 Yes 1
3 Yes 1
4 Yes 1
>
>
>
> data.weighted <- data.frame(
+ kindergarten_attendance = factor(c(2,2,2,2,2,2,2,2,2,2,1,1,1), labels =
c("Yes", "No")) );
>
>
> par(mfrow=c(1,2));
> plot(data.recieved$kindergarten_attendance,main="What i get");
> plot(data.weighted$kindergarten_attendance,main="What i want to get");
>
tnx in advance
Hed
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