IntervalQuestionStat - Tools to Deal with Interval-Valued Responses in Questionnaires
A user-friendly toolbox for doing the statistical analysis
of interval-valued responses in questionnaires measuring
intrinsically imprecise human attributes or features
(attitudes, perceptions, opinions, feelings, etc.). In
particular, this package provides S4 classes, methods, and
functions in order to compute basic arithmetic and statistical
operations with interval-valued data; prepare customized plots;
associate each interval-valued response to its equivalent
Likert-type and visual analogue scales answers through the
minimum theta-distance and the mid-point criteria; analyze the
reliability of respondents' answers from the internal
consistency point of view by means of Cronbach's alpha
coefficient; and simulate interval-valued responses in this
type of questionnaires. The package also incorporates some
real-life data that can be used to illustrate its working with
several non-trivial reproducible examples. The methodology used
in this package is based in many theoretical and applied
publications from SMIRE+CoDiRE (Statistical Methods with
Imprecise Random Elements and Comparison of Distributions of
Random Elements) Research Group
(<https://bellman.ciencias.uniovi.es/smire+codire/>) from the
University of Oviedo (Spain).