It is also the ordinal type of a certain ordering of rooted trees.
2.
The use of the mean as a measure of the central tendency for the ordinal type is still debatable among those who accept Stevens's typology.
3.
The ordinal type allows for rank order ( 1st, 2nd, 3rd, etc . ) by which data can be sorted, but still does not allow for relative " degree of difference " between them.
4.
This is often justified on the basis that the ordinal type in behavioural science is in fact somewhere between the true ordinal and interval types; although the interval difference between two ordinal ranks is not constant, it is often of the same order of magnitude.
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