The Misdetect Rate
March 2, 2007

The Misdetect Rate

Now we will repeat the experiment we just did but in a slightly different form. Each point of the first set has a closest interpoint distance to the second set. There are ten points in the first set. Likewise each point in the second set has a closest interpoint distance to the first set. There are also ten points in the second set. Hence there are a total of twenty closest interpoint distances associated with the point sets. We next explore as test statistics the arithmetic mean, the harmonic mean, the geometric mean, and the maximum interpoint distance of these twenty closest interpoint distances. The table below shows the misdetect rate when we perform a hypothesis test at the 1% significance level.

Test Statistic Misdetect Rate Power
Min .4097.5903
Arithmetic Mean .1923.8097
Geometric Mean .0245 .9755
Harmonic Mean .1365.8635
Max .9061 .0939

Table showing the misdetect rate for different test statistics for a 1% significance level test

We see an interesting change. If we work with all the 100 interpoint distances, then the harmonic mean was the best with a misdetection rate of .11. But if we let each point find its best point in the other set, and we work with these twenty best interpoint distances, the geometric mean provides the smallest misidentification rate of .0245.

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