Het matchen in de psychologie

Matching in Psychology
In experimental psychology the matching method seems to be one of the most promising methods. This paper deals with the matching of a series of t elements against a series of t other elements. The stated null hypothesis is: for a fixed order of one of the series each permutation of the second series has the same probability.
As a test criterion in the case of one matching is defined: the number r of matches, e.g. the number of "right pairs"; for n matchings: .
As the distribution of for t=3 cannot be found in literature, a table of is given for n=I(I)30: see table I. The way of calculating and verifying is discussed.
For the problem of t=3 and n 31 the degree of approximation by the normal distribution and by the Pearson's Type III distributions is examined. With the application of a correction for continuity the former gives for n=30 a reasonable approximation, the latter a very good approximation: see table 2.