Re: categorical data analysis question

Posted by Art Kendall on May 21, 2015; 12:32pm
URL: http://spssx-discussion.165.s1.nabble.com/categorical-data-analysis-question-tp5729576p5729586.html

You could also try 2D and 3D scatterplots.  (by using colors and or shapes) you could put 4 or 5 variables in the graphic.  In the output file you could use the editor to rotate graphic and view it from different perspectives.

Given that these are Likert items, the zero order correlation, corrected item-total correlations,  squared multiple correlations, and alpha if item deleted  are more conventional in reviewing item quality.


WRT 4 point response scale. If you are involved in writing the items that represent a construct via a scale, I lean toward having as many points on the response scale as is practical given the respondents' capabilities.  This helps the resulting scale be more fine-grained.  When the underlying construct is continuous, it is intuitive to have the coarse repeated measures of a construct be as close to continuous as is practical under the circumstances.

In some disciplines it appears that 4 point response scales made the use a counter-sorter easier, i.e., the deck of punch cards had to be passed through more frequently. Counter-sorters are now found in historical exhibits.