Guttman errors, Guttman reversals |
Winsteps does not report Guttman reversals. It can be done with the R Statistics package: GetR
The procedure:
1. Install the free software R Statistics
2. Run Winsteps on your data
3. Output Files menu: IPMATRIX=
Field: scored responses
No person details
No item details
Include extreme persons
Include extreme items
Output to R Statistics with a temporary file
4. R Statistics launches with "data" dataset
In your R window, do this once:
install.packages("GetR") # do this once
Then each time afterwards, copy and paste this into your R window:
library (GetR)
guttmanErrors(data) # the count of Guttman errors for each person displays
sum(guttmanErrors(data)) # the total number of Guttman errors
sum(guttmanErrors(data))/nrows(data) # the average number of Guttman errors per person
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