What Do Successive Frequency Distributions Show?
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Comparisons of successive frequency distributions may be made in two distinct ways
that are frequently confused. One way is to make comparison against a given set of
class intervals covering the relevant range of the data. The result is a fixed frame of
reference, a single classification grid. The other way is to compare "corresponding
relative parts" of the frequency distributions-the quartiles, deciles, or similar scale
orderings. Such scale orderings, in effect, adjust the class intervals for each distribution
so that they are keyed to the central tendency of that distribution. This analysis uses
data on stature of fathers and their sons to illustrate the confusion that can occur.