Exercise: observer agreement about eye colour, answer 2

Question

The expected agreement is much lower than for sex, where it was 54.52%. Why is this?

Suggested answer

There are many more cells in the eye colour table, 77 = 49, compared to 4 in the sex table, and only 7 of them, 7/49 = 14%, are where there would be agreement, compared to 2/4 = 50% in the sex table. Hence there is less scope for expected or chance agreement in the eye table than in the sex table.


Back to question.

To Martin Bland's home page.

This page maintained by Martin Bland.
Last updated: 21 July, 2008.

Back to top.