optiscale-package: Optimal Scaling of a Data Vector

In optiscale: Optimal Scaling

Description

This package provides tools to perform an optimal scaling analysis on a data vector. The main result of the optimal scaling is a vector of scores which are a least-squares approximation to a vector of quantitative values, subject to measurement constraints based upon a vector of qualitative data values. See Young (1981) for details.

Details

Package:	optiscale
Type:	Package
Version:	1.2.2
Date:	2021-02-02
License:	GPL-2
LazyLoad:	yes

The function that performs the optimal scaling is opscale(). It produces an object of class "opscale". Generic methods are defined for print, summary, and plot (graphing optimally-scaled values versus original data values).

Author(s)

William G. Jacoby

Maintainer: William G. Jacoby <[e-mail]>

References

Young, Forrest W. (1981) “Quantitative Analysis of Qualitative Data.” Psychometrika 46: 357-388.

See Also

opscale,plot.opscale, print.opscale, summary.opscale

Examples

  ###   x1 is vector of qualitative data
  ###   x2 is vector of quantitative values
            x1 <- c(1,1,1,1,2,2,2,3,3,3,3,3,3)     
            x2 <- c(3,2,2,2,1,2,3,4,5,2,6,6,4)     
  ###   Optimal scaling, specifying that x1
  ###   is ordinal-discrete
     op.scaled <- opscale(x.qual=x1, x.quant=x2,   
                  level=2, process=1)              
     print(op.scaled)
     summary(op.scaled)

Example output

Loading required package: lattice
Optimal Scaling Object for Variable x1 : 

   qual quant       os
1     1     3 1.354438
2     1     2 1.354438
3     1     2 1.354438
4     1     2 1.354438
5     2     1 1.354438
6     2     2 1.354438
7     2     3 1.354438
8     3     4 3.086489
9     3     5 3.086489
10    3     2 3.086489
11    3     6 3.086489
12    3     6 3.086489
13    3     4 3.086489
Optimal Transformation for Variable x1 : 

      Measurement Level:  Ordinal 
    Measurement Process:  Discrete 

  initial.values OS.values
1              1  1.354438
2              2  1.354438
3              3  3.086489

optiscale documentation built on Feb. 3, 2021, 9:06 a.m.