Estimating agreement between two binary or semi-quantitative methods

Measure the agreement between a test method and a reference or comparative method when both variables are binary or semi-quantitative.

1. Select a cell in the dataset.
2. On the Analyse-it ribbon tab, in the Statistical Analyses group, click Method Comparison (or Agreement depending on the edition), and then click Binary (PPA/NPA) or Semi-Quantitative.
   The analysis task pane opens.
3. In the X drop-down list, select the comparative or reference measurement procedure, or the first observer/factor variable.
4. In the Y drop-down list, select the test measurement procedure, or the second observer/factor variable.
5. If the data are in frequency form, in the Frequency drop-down list, select the frequency count variable.
6. In the Measure drop-down list, select the measure of agreement:

   Option	Description
   Reference	Compute the proportion of the Y (Test method) that agree with the X (Reference / Comparative method). Useful to make comparisons against a reference method or the current laboratory method. Note: This method is asymmetric and the agreement is different depending on the assignment of X and Y.
   Average	Compute the Dice-Sorenson measure of average agreement. Useful when comparing say 2 observers or laboratories where neither is a natural comparator. Note: This method is symmetric and doesn't depend on assignment of X and Y.

7. On the Analyse-it ribbon tab, in the Method Comparison group, click Estimate and then select an overall agreement estimator.
8. Click Calculate.