1.  After you paste your results in Table A and B, several figures and analyses will be automatically done.

2.   Break into two or more groups. Use one card to answer each of the following questions:

2.1. What patterns do you see in Figure A? Is the distribution of the errors random, or is there more variability in a certain range of disease severity? Relate your observations to the Weber-Fechner law (see Background ).

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2.2. What parameters can be used to evaluate the accuracy and the precision of the estimates? See Table D.

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2.3. Which scale enables more accurate and precise estimates of disease severity? Why?

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2.4.  How might the use of one of these scales (percentage and Horsfall-Barratt) affect your analyses and interpretation of results?

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