Learn how to calculate scored-interval, unscored-interval, and interval-by-interval Interobserver agreement IOA

Using the following data:

Calculate scored-interval IOA

2/7 * 100 = 28.57%

  1.  Mark all the intervals where at least 1 person scored the occurrence of the behavior.
  2.  Using only the intervals where at least 1 person scored the occurrence of the behavior divide the agreements of both observers by the total number of trials in which at least 1 person scored the occurrence of the behavior and multiply by 100.

Calculate unscored-interval IOA

3/8 * 100 = 37.5%

  1.  Mark all the intervals where at least 1 person scored the nonoccurrence of the behavior.
  2. Using only the intervals where at least 1 person scored the nonoccurrence of the behavior divide the agreements of both observers by the total number of trials in which at least 1 person scored the nonoccurrence of the behavior and multiply by 100

Calculate interval-by-interval IOA

5/10 * 100 = 50%

  1.  Mark all the intervals where both observers agree with each other
  2. Divide agreements by the total number of intervals and multiply by 100.

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