Linked Questions

0
votes
1answer
2k views

Factor analysis on non normal data ( Ordinal data of Likert Scale) [duplicate]

How to check the normality of data collected on 5 point Likert scale? As it is ordinal numbers not continuous. Using SPSS the Shapiro Wilk or Kolmogorov-Smirnov test indicate my data is not normal. ...
335
votes
16answers
116k views

Is normality testing 'essentially useless'?

A former colleague once argued to me as follows: We usually apply normality tests to the results of processes that, under the null, generate random variables that are only asymptotically or ...
11
votes
6answers
2k views

Is it appropriate to treat n-point Likert scale data as n trials from a binomial process?

I've never liked how people typically analyze data from Likert scales as if error were continuous & Gaussian when there are reasonable expectations that these assumptions are violated at least at ...
8
votes
2answers
18k views

Whether to use original or reverse coded items in factor analysis?

I am currently analyzing data from a 34-item Likert scale. I already recoded the negatively stated variables in SPSS as different variables. I'm about to do a factor analysis. Should I use the ...
12
votes
3answers
486 views

Is it better to select distributions based on theory, fit or something else?

This is bordering on a philosophical question, but I am interested in how others with more experience think about distribution selection. In some cases it seems clear that theory might work best (mice ...
0
votes
2answers
869 views

When to dichotomize a variable for correlational analysis? [closed]

This is the question I am trying to answer : I’m working on a thesis project and have a variable that is normally distributed and related to happiness. I am considering to split my sample into ...
4
votes
3answers
3k views

Reporting the use of different likert-scales in survey for structural equation modelling?

Suppose you are doing a survey and from the data you want to build a structural equation model. The research model consists of 5 constructs and each of them has between 2 and 5 items. The survey uses ...
3
votes
1answer
10k views

Correlational study or ordinal data using 5-point Likert scale

How do I calculate the correlation using ordinal data based on a 5-point Likert scale associating perioperative education to patient satisfaction scores? A numerical value (...
1
vote
1answer
1k views

Regression testing after dimension reduction

I have a 12 item Likert scale for my predictor variable [IV], and a 9 item Likert scale for my dependent variable [DV]. I used SPSS and did factor analysis on both scales, and found that the IV had 3 ...
4
votes
1answer
1k views

Why change items which don't change Cronbach Alpha?

I am doing peer review on a paper submission for a journal, and I am somewhat out of my depth. The authors are developing a psychometric scale. They did a pilot study with 45 items. They measured ...
2
votes
2answers
2k views

Singular covariance matrix in exploratory Factor Analysis

I'm kind of a noob to EFA and am trying to use the FANode object in Python. This is from the MDP library. I am using it on survey data to see which variables are tied together. Whenever I run it on my ...
0
votes
2answers
2k views

Can I regress an index value with variables used to create the index?

I developed an index value (vulnerability score scale of 0 to 1) using a series of variables. I would like to regress these variables with the index value to determine the relative predictive power of ...
2
votes
3answers
1k views

Can we visualise regression results through diagram?

I read a journal article, in which the authors made a diagram based on regression results (beta weights). Pretty much looks like a path analysis: I'm very sure that path analysis/SEM was not employed ...
0
votes
2answers
467 views

factor analysis problem in structural equation model

I am using an Extended Technology Acceptance Model and have adopted an instrument from a research paper. After performing factor analysis in SPSS, most questions related to different constructs (...
0
votes
1answer
1k views

Calculating total score for a scale including polytomous and dichotomous items [duplicate]

I have a variable that is measured using a 13-item, 4-point Likert scale with the exception of one item (yes $=1$, no $=2)$. How can I calculate the total score for this variable?

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