IMPACT

 

The Impact of Items
This function returns a multivariate analysis of the impact of items to identify biases in the 
questionnaire validation.

To install the packages, copy  and run the following commands into the r console. This runs in 
all operating systems.

 

WINDOWS / LINUX / MAC OS X 

1
#Comand to install
install.packages("IMPACT")
2
#Call to library
library(IMPACT)
3
#Description 
library(help=IMPACT)
4
#View the requirements 
?IMPACT

 

EXAMPLE

1
 library(IMPACT)
2
#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)
3
#Put names of variables
    colnames(x)<-c(paste("A","-",1:10))
4
#Declare a null value.
    y<-3
5
#Use the library
    IMPACT(x,y)

 

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 Clinical Epidemiology, 233-238. 

- 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). Análisis del Impacto frente a Teoría de Respuesta al Item (Trabajo Fin de 
Master). Master Universitario en Análisis Avanzado de Datos Multivariantes, Statistics Department, 
University of Salamanca, Spain.

 

DOCUMENTATION

CITATION

 - To cite package ‘IMPACT’ in publications use:

  Nery Sofia Huerta-Pacheco (2017). IMPACT: The Impact of Items. R
  package version 0.1.1. https://CRAN.R-project.org/package=IMPACT

- A BibTeX entry for LaTeX users is

  @Manual{,
    title = {IMPACT: The Impact of Items},
    author = {Nery Sofia Huerta-Pacheco},
    year = {2017},
    note = {R package version 0.1.1},
    url = {https://CRAN.R-project.org/package=IMPACT},
  }

contacto

Nery Sofia Huerta Pacheco