# weighted kappa

1. ### Error message for weighted kappa

I am working with ordinal scales for cerebral atrophy (ratings 0 to 4) and vascular burden (ratings 0 to 3) assessed by two raters. I have installed the extension bundle for weighted kappa from SPSS (version 25) but I keep getting the error message "some ratings are less than one this command is...
2. ### High correlation but different median scores. How can this be possible?

I am writing a research paper. We asked the same patients to fill out a form at two different times. Data is non-normal. I used Spearman's correlation, which gave me a moderate correlation between the two scores. I also used weighted kappa and this too gave me a moderate agreement between both...