Gwet’s AC1 and AC2

Gwet’s AC2 is another measurement of inter-rater reliability. The advantage of this approach is that it supports categorical (Gwet’s AC1), ordinal, interval and ratio type data and also handles missing data.

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References

Gwet, K. L. (2001) Handbook of Interrater reliability. STATAXIS Publishing

Gwet, K. L. (2015) On Krippendorff’s alpha coefficient
https://agreestat.com/papers/onkrippendorffalpha_rev10052015.pdf

Girard, J. M. (2016) Gwet’s gamma coefficient, GitHub
https://github.com/jmgirard/mReliability/wiki/Gwet’s-gamma-coefficient

15 thoughts on “Gwet’s AC1 and AC2”

  1. Thank you for the web page. I’m trying to calculate Gwet’s AC2 with two judges, but I can’t, it only works with three or more judges. Is it possible to run it with two judges? Thank you.

    Reply
  2. Hello-
    Thank you for this wonderful site!
    I was wondering how to calculate Gwet’s AC1. I only see AC2 as an option for reliability. Do we just run the AC2 agreement table analysis after converting our categorical data into an agreement table?

    Thank you!

    Reply

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