Use the following data from a whole interval recording procedure to calculate interobserver agreement (interrater reliability). Also discuss if you believe the reliability is very good or poor:
Intervals 1 2 3 4 5 6 7 8 9 10
Rater A: + + + - + - - + - +
Rater B: + - + - + + - + + -
Fill in the blank(s) with the appropriate word(s).
The correct answer is 60%. Although both raters identified six intervals during which the target behavior occurred and four in which it did not, there were disagreements as to which intervals were scored. Intervals 2, 6, 9, and 10 all have disagreements. Therefore, 6 agreements divided by 10 intervals = 6/10 X 100% = 60%. This is poor interobserver agreement.
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