# Questions tagged [parallel-analysis]

Parallel analysis is a criterion used to help decide the number of principal components or principal factors/common factors to retain. It is based on retaining eigenvalues of observed data greater than those corresponding mean eigenvalues from many data sets of uncorrelated data with the same $n$ observations and $p$ variables as the observed data.

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### Are imaginary eigenvalues a fatal flaw when doing a factor analysis?

I am running an exploratory factor analysis (EFA) in R, extracting three factors (determined via parallel analysis). ...
141 views

### Parallel trend analysis in a two period panel data

I have a dataset , which is in panel nature for two time periods. I would like to whether it is possible to perform a DID analysis, and if yes is it possible to do a parallel trend analysis for only ...
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### How would you test for parallel trends in a panel data set of 2 time periods under DDD framework?

Suppose i have a panel data with 2 time periods (pre and post events), how would i test for parallel trends assumption under a DDD framework?
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1 vote
82 views

### difference between 'psych::fa.parallel()' and 'paran::paran()' in Horn's parallel analysis [closed]

I am trying to conduct an explanatory factor analysis for data with dichotomous variables(csv Google link, n = 1000 originally but only 500 here) with a WLSMV estimator using ...
1 vote
131 views

### Differential model. Random Forest

I was having discussion with some colleagues and I would like to know some external opinion. Description: We have to decide, for a given person, whether that person would choose item EXPENSIVE or ...
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1 vote
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### EFA Parallel Analysis

First time poster, I'm looking for some assistance with parallel analysis in R. I am doing exploratory factor analysis (EFA) on a 22 item questionnaire (n=6598) and looking for an effective way to ...
408 views

### Does it make sense to use criteria from PCA to select the numbers of factors in a factor analysis?

Looking at both the practice of colleagues and also the practices instantiated in popular programs (e.g. SPSS, and commonly used syntax for SPSS), it seems common to use criteria based on a PCA to ...
488 views

### Squared Multiple Correlation (SMC) of my correlation matrix tend towards 1. How to interpret this?

In order to be able to conduct exploratory factor analysis, I want to carry out parallel analysis to determine the number of factors to be extracted. To do so, I want to extract the eignevalues of the ...
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1 vote
27 views

### What statistical techniques can I use to model improvement over time?

Say you have a group of 30 students and you measure each individual's performance on a test at 4 intervals throughout the year. (For the purpose of this investigation, assume the tests taken are ...
1 vote
812 views

### Unexpected eigenvalues in parallel analysis for factor analysis in SPSS

Would greatly appreciate if someone could clarify which eigenvalues I am supposed to compare when using parallel analysis to determine factor retention. I am running Principal Axis Factoring in SPSS ...
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1 vote
1k views

### Choosing how many factors to retain based on parallel analysis and on a scree plot without an elbow

When I realize the Factor Analysis (I have 16 items), the PCA says I have 5 factors. But in the scree plot there is no elbow at all, just a decreasing line, that makes me think maybe I shouldn't be ...
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1k views

### A paper mentions a "Monte Carlo simulation to determine the number of principal components"; how does it work?

I'm doing a Matlab analysis on MRI data where I have performed PCA on a matrix sized 10304x236 where 10304 is the number of voxels (think of them as pixels) and 236 is the number of timepoints. The ...
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443 views

### How do random data eigenvalues change, as random variables are added?

I am using parallel analysis (Horn 1965) to determine how many principal components I can extract from my data. I can add more variables to my dataset, but I cannot add more cases (I know, that's ...
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### Strange results in parallel analysis -- weird output by rstudio but not R-Fiddle

Major UPDATE based on discussion with Aleksandr Blekh's answer (thanks so much!): This MRE would run with no problem in R-Fiddle ...
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### How to correctly interpret a parallel analysis in exploratory factor analysis?

Some scientific papers report results of parallel analysis of principal axis factor analysis in a way inconsistent with my understanding of the methodology. What am I missing? Am I wrong or are they. ...
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### Permutation test for factor analysis

We have a survey instrument and are interested in assessing dimensionality of it. Looking at plots of multidimensional scaling, it appears as though there are, perhaps, 3 distinct dimensions to the ...
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### Can I do parallel analysis with any type of exploratory factor analysis/principal component analysis?

I wish to perform parallel analysis to determine how many factors I should extract from my maximum likelihood exploratory factor analysis. I have been referred to a program that calculates the ...
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6k views

### What's the difference between a component and a factor in parallel analysis?

The psych package in R has a fa.parallel function to help determine the number of factors or components. From the documentation: ...
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