The coefficient of variation should be computed only for data measured on a ratio scale, as these are the measurements that can only take non-negative values.
12.
Most psychological data collected by psychometric instruments and tests, measuring cognitive and other abilities, are ordinal, although some theoreticians have argued they can be treated as interval or ratio scales.
13.
Secondly, relative error only makes sense when measured on a ratio scale, ( i . e . a scale which has a true meaningful zero ), otherwise it would be sensitive to the measurement units.
14.
He also suggested that given the associations between " g " and elementary cognitive tasks, it should be possible to construct a ratio scale test of " g " that uses time as the unit of measurement.
15.
Lovaas ( 1998 ) argued that the ratios for the experimental group, control group 1, and control group 2 of 16 : 3, 11 : 8, and 16 : 5, respectively, were in fact near the expected ratio scale of the general population with the exception of control group 1.
16.
The LA / VP weight gain ratio from rat experiments is not unitary for testosterone ( typically 0.3 0.4 ), but it is normalized for presentation purposes, and used as basis of comparison for other AAS, which have their androgenic : anabolic ratios scaled accordingly ( as shown in the table above ).
17.
This is because the amount of reaction scales with the cube of the size of the vessel ( V " r?), but the heat transfer area scales with the square of the size ( A " r?), so that the heat production-to-area ratio scales with the size ( V / A " r ).
18.
The form of the population distribution of " g " is unknown, because " g " cannot be measured on a ratio scale . ( The distributions of scores on typical IQ tests are roughly normal, but this is achieved by construction, i . e ., by normally distributed in the general population, at least within a range of ? standard deviations from the mean.
