Tagged Questions

1
vote
1answer
50 views

How to analyze ordinal repeated measures data

I have data from an ordinal scale, with the score ranging from 1-4. Each subject has 9 assessments on this scale (study is a 9-way crossover design), and there are no missing data. What is the ...
2
votes
3answers
132 views

Pros/Cons of recoding ordinal/nominal variables to target mean for logistic regression?

Say I have an independent variable with the following relationship to the binary dependent variable, DV: ...
0
votes
0answers
15 views

orthogonal contrast with an ordinal variable in gam

I am fitting a set of continuous and factor variables into a GAM. The factors are ordinal: they are levels of abundance of specific macroinvertebrates set as "none" (0% cover), "low" (>0-10% cover) ...
0
votes
0answers
57 views

finding the residual variance after correcting ordinal data for sex

I have a data set organized as: males, females as groups. Each individual has a "score" that is ordinal, ranking 0,1, or in another case, 0,1,2. I need to find the residual variation after correcting ...
1
vote
0answers
402 views

Polychoric PCA and component loadings in Stata

I’m using Stata 12.0, and I’ve downloaded the POLYCHORICPCA.ado written by Stas Kolenikov, which I wanted to use it with data that I have that includes a mix of categorical and continuous variables. ...
6
votes
3answers
333 views

Which logit/probit model do I use for multiple reponse/dependent variables?

I have $300$ time series objects that constitute the $300$ columns of matrix $X$. This matrix has $5$ rows and represents $5$ days of time series information for each $300$ columns. I set up a ...
2
votes
0answers
55 views

Manipulating ordinal variables to segment data

Im working with a negative binomial regression where the dependent variable is number of trips by any given mode (i.e. car trips, train trips etc). I would like to create a variable to segment the ...
4
votes
0answers
38 views

Analysing when tunes are alike: testing ordinal and categorical similarity

I'd like to compare some Jazz tunes. Jazz tunes are characterized by a succession of chords. The interval between each succeeding chord (number of tones) and the order in which they appear matter. ...
1
vote
3answers
2k views

About correlation of ordinal variables having different number of categories and about correlation of mixed type of variables

I have three questions: For data with different response categories (likert type or ordinal) what type of correlation should be calculated? I know for ordinal variables Spearman's rank correlation ...
3
votes
1answer
1k views

Factor analysis for ordinal variables that have different categories

I have a data set that contains about 40 categorical variables that are taken as independent variables (and believed to be related to some unobservable human resource factors) and 4 categorical ...
5
votes
2answers
3k views

How to transform ordinal data from questionnaire into proper interval data?

Are there any straightforward methods of transforming ordinal level data into interval level (just as there are for doing it the other way round)? And performable in Excel or SPSS? Having the data, ...
0
votes
0answers
603 views

How to perform correspondence analysis on ordinal data in SPSS?

I have 500 rows and three columns. Two of the variables (that i want to analyze) are in ordinal form and the other in scale. However, when i run the correspondence analysis wizard in SPSS i can only ...
1
vote
1answer
619 views

More than one outcome (dependent) variables in ordinal logistic regression

I want to run ordinal logistic regression (OLR) in SPSS. My data include 6 predictor variable (two continuous and 4 categorical ) but my outcome variables are also 6 (categorical-likert scale). e.g my ...
3
votes
1answer
572 views

Independent variables in ordinal logistic regression

One of my IV's for my ordinal logistic regression is a nominal categorical variable with 4 categories. Most examples I see for this type of logistic regression have only binary categorical variables. ...
2
votes
0answers
132 views

What is a good reference on simulating ordinal random variables?

I'm interested in any references for simulating ordinal random variables to be used in a Bayesian (multilevel) analysis.
3
votes
2answers
2k views

Factor analysis on mixed (continuous/ordinal/nominal) data?

What approaches are there to perform FA on data that is clearly ordinal (or nominal for that matter) by nature? Should the data be transformed our are there readily available ...