| Title: | The Impact of Items |
|---|---|
| Description: | Implement a multivariate analysis of the impact of items to identify a bias in the questionnaire validation of Likert-type scale variables. The items requires considering a null value (category doesn't have tendency). Offering frequency, importance and impact of the items. |
| Authors: | Nery Sofia Huerta-Pacheco |
| Maintainer: | Nery Sofia Huerta-Pacheco <[email protected]> |
| License: | GPL (>= 2) |
| Version: | 0.1.1 |
| Built: | 2025-02-15 03:22:54 UTC |
| Source: | https://github.com/cran/IMPACT |
This function returns an estimation based on the patterns of items.
Introduce a set of categorical data set classifed as numerical data.
IMPACT(x, y)IMPACT(x, y)
x |
is a data set |
y |
is a null value |
This function returns a multivariate analysis of the impact of items to identify a bias in the questionnaire validation. It estimates the impact of items.
This funtion takes a set of values produced by the IMPACT. functions returns estimations for each item provided in the input x matrix.
Null.value a null value
Less.impact values of the item with less impact
Greater.impact values of the item with greater impact
Summary.table a summary table with the impact of items
Nery Sofia Huerta-Pacheco
Juniper, E. F., Guyatt, G. H., Streiner, D. L., & King, D. R. (1997). Clinical impact versus factor analysis for quality of life questionnaire construction. Journal of ClinicalEpidemiology, 233-238.
Allen, F., & Locker, D. (2002). A Modified Short Version of the Oral Health Impact Profile for Assessing Health-Related Quality of Life in Edentulous Adults. The International Journal of Prosthodontics, 15(5), 446-450.
Lesaffre, E. (2009). Statistical and methodological aspects of oral health research. John Wiley & Sons. DOI: 10.1002/9780470744116
Vicente Galindo, E. D. (2011). Analisis del Impacto frente a Teoria de Respuesta al Item (Trabajo Fin de Master). Master Universitario en Analisis Avanzado de Datos Multivariantes, Statistics Department, University of Salamanca, Spain.
## Not run: library(IMPACT) ##Reads a likert-type scale dataset x<-matrix(c(2, 5, 5, 4, 4, 5, 4, 4, 5, 1, 3, 4, 4, 1, 5, 2, 2, 4, 3, 5, 5, 1, 1, 4, 5, 2, 2, 4, 4, 5, 2, 4, 2, 5, 3, 4, 3, 3, 5, 3, 3, 5, 5, 5, 5, 5, 5, 5, 5, 3, 4, 3, 5, 3, 4, 5, 4, 4, 4, 5, 4, 1, 2, 2, 3, 1, 1, 3, 2, 5, 3, 2, 1, 5, 2, 2, 4, 1, 5, 1, 2, 4, 4, 4, 3, 5, 5, 4, 2, 2, 4, 3, 5, 2, 4, 5, 4, 4, 1, 5, 4, 1, 2, 3, 3, 1, 2, 5, 4, 5, 4, 3, 1, 4, 1, 3, 4, 2, 4, 2, 4, 1, 2, 3, 4, 1, 1, 4, 4, 5, 3, 3, 1, 1, 1, 4, 4, 2, 4, 1, 5, 1, 3, 3, 4, 5, 3, 5, 4, 5, 4, 4, 2, 5, 2, 4, 4, 4, 4, 4, 4, 4, 2, 3, 1, 3, 2, 3, 3, 1, 1, 2, 4, 1, 5, 2, 2, 3, 3, 4),20,10) ##Put names of variables colnames(x)<-c(paste("A","-",1:10)) ##Declare a null value y<-3 IMPACT(x,y) ## End(Not run)## Not run: library(IMPACT) ##Reads a likert-type scale dataset x<-matrix(c(2, 5, 5, 4, 4, 5, 4, 4, 5, 1, 3, 4, 4, 1, 5, 2, 2, 4, 3, 5, 5, 1, 1, 4, 5, 2, 2, 4, 4, 5, 2, 4, 2, 5, 3, 4, 3, 3, 5, 3, 3, 5, 5, 5, 5, 5, 5, 5, 5, 3, 4, 3, 5, 3, 4, 5, 4, 4, 4, 5, 4, 1, 2, 2, 3, 1, 1, 3, 2, 5, 3, 2, 1, 5, 2, 2, 4, 1, 5, 1, 2, 4, 4, 4, 3, 5, 5, 4, 2, 2, 4, 3, 5, 2, 4, 5, 4, 4, 1, 5, 4, 1, 2, 3, 3, 1, 2, 5, 4, 5, 4, 3, 1, 4, 1, 3, 4, 2, 4, 2, 4, 1, 2, 3, 4, 1, 1, 4, 4, 5, 3, 3, 1, 1, 1, 4, 4, 2, 4, 1, 5, 1, 3, 3, 4, 5, 3, 5, 4, 5, 4, 4, 2, 5, 2, 4, 4, 4, 4, 4, 4, 4, 2, 3, 1, 3, 2, 3, 3, 1, 1, 2, 4, 1, 5, 2, 2, 3, 3, 4),20,10) ##Put names of variables colnames(x)<-c(paste("A","-",1:10)) ##Declare a null value y<-3 IMPACT(x,y) ## End(Not run)