| Version: | 0.1.1 |
| Date: | 2017-07-20 |
| Title: | The Impact of Items |
| Author: | Nery Sofia Huerta-Pacheco |
| Maintainer: | Nery Sofia Huerta-Pacheco <nehuerta@uv.mx> |
| Depends: | R(≥ 3.0.0) |
| 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. |
| License: | GPL-2 | GPL-3 [expanded from: GPL (≥ 2)] |
| URL: | http://www.uv.mx/personal/nehuerta/impact |
| Encoding: | UTF-8 |
| NeedsCompilation: | no |
| RoxygenNote: | 6.0.1 |
| Packaged: | 2017-07-21 02:53:08 UTC; sofia.huerta.p |
| Repository: | CRAN |
| Date/Publication: | 2017-07-21 10:01:55 UTC |
The Impact of Items
Description
This function returns an estimation based on the patterns of items.
Introduce a set of categorical data set classifed as numerical data.
Usage
IMPACT(x, y)
Arguments
x |
is a data set |
y |
is a null value |
Details
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.
Value
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
Author(s)
Nery Sofia Huerta-Pacheco
References
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.
Examples
## 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)