Categorical variables with more than two possible values are called "'polytomous variables "'; categorical variables are often assumed to be polytomous unless otherwise specified.
12.
More than one rating scale question is required to measure an attitude or perception due to the requirement for statistical comparisons between the categories in the polytomous Rasch model for ordered categories.
13.
It is therefore evident that in general, the response subspace \ Omega', as defined earlier, is " intrinsic " to the structure of the polytomous Rasch model.
14.
Multi-access keys largely serve the same purpose as single-access ( dichotomous or polytomous ) keys, but have many advantages, especially in the form of computer-aided, interactive keys.
15.
Likert scale data can, in principle, be used as a basis for obtaining interval level estimates on a continuum by applying the polytomous Rasch model, when data can be obtained that fit this model.
16.
"' David Andrich "'has made substantial contributions to quantitative social science including seminal work on the Polytomous Rasch model for measurement, which is used in the social sciences, in health and other areas.
17.
With respect to " B . media ", however, Mast's results accord closely with the arrangement of Thiele and Ladiges, placing it in a polytomous clade corresponding exactly with Thiele and Ladiges "'B . " ser . " Cyrtostylis ".
18.
With respect to " B . praemorsa ", however, Mast's results accord closely with the arrangement of Thiele and Ladiges, placing it in a polytomous clade corresponding exactly with Thiele and Ladiges "'B . " ser . " Cyrtostylis ".
19.
With respect to " B . epica ", however, Mast's results accord closely with the arrangement of Thiele and Ladiges, placing it in a polytomous clade corresponding exactly with Thiele and Ladiges "'B . " ser . " Cyrtostylis ".
20.
In the polytomous Rasch model, a score of " x " on a given item implies that an individual has simultaneously surpassed " x " thresholds below a certain region on the continuum, and failed to surpass the remaining " m " & minus; " x " thresholds above that region.
