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A comparison of some methodologies for the factor analysis of non‐normal Likert variables
Abstract
This paper considers the problem of applying factor analysis to non‐normal categorical variables. A Monte Carlo study is conducted where five prototypical cases of non‐normal variables are generated. Two normal theory estimators, ML and GLS, are compared to Browne's (1982) ADF estimator. A categorical variable methodology (CVM) estimator of Muthén (1984) is also considered for the most severely skewed case. Results show that ML and GLS chi‐square tests are quite robust but obtain too large values for variables that arc severely skewed and kurtotic. ADF, however, performs well. Parameter estimate bias appears non‐existent for all estimators. Results also show that ML and GLS estimated standard errors are biased downward. For ADF no such standard error bias was found. The CVM estimator appears to work well when applied to severely skewed variables that had been dichotomized. ML and GLS results for a kurtosis only case showed no distortion of chi‐square or parameter estimates and only a slight downward bias in estimated standard errors. The results are compared to those of other related studies.
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“The normality of continuous variables was assessed by examining skewness statistics and normal probability plots. Following the suggestion by Muthen and Kaplan [65], skewness and kurtosis values within the range of −1 to +1 were considered acceptable indicators of normality.”
In the citing paper
“In the empirical field, an inverse association has been consistently found between the capacity for full awareness of the present moment (mindfulness) and the presence of psychological distress [20, 24].”
From Psychological inflexibility mediates the relationship between mindfulness and psychological distress in Peruvian parents with school age children. (2026) · cites this paper as [24]
In the citing paper
“Univariate normality of the data was verified using the guidelines proposed by Muthén and Kaplan (1985) before the analysis of the sample’s results (i.e., to check if acceptable values for asymmetry/asymmetry and kurtosis were in the range from − 1 to + 1 in the case of normal univariate data distribution).”
From Validation and Psychometric Evaluation of the Italian Version of the Fear of COVID-19 Scale (2022) · cites this paper as Muthén and Kaplan (1985)
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“In the case of an asymmetric distribution or excess kurtosis of ordinal items, the use of polychoric correlations was advised [48, 49].”
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“The procedure used to generate the data was similar to that of Muthén and Kaplan (1985, 1992) and is as follows: 1.”
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“…included between a range Europe's Journal of Psychology 2020, Vol. 16(2), 331–351 https://doi.org/10.5964/ejop.v16i2.1876 of -1 and +1 are considered acceptable (Muthén & Kaplan, 1985) and the histogram, as well as the Normal Q-Q Plot, showed that responses were reasonably normally distributed.”
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“Since a substantial number of items in both subgroups showed values of skewness and kurtosis that fell outside the [ 1; +1] range recommended by Muthén and Kaplan (1985) for using maximum likelihood estimator (see Table 1), factor analyses were performed in Mplus 6.1 using the mean and variance…”
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“Therefore we run a bi-factor model and an unrestricted parallel analysis based on minimum rank factor analysis [21] (PA; dispersion matrix: polychoric correlations [22, 23] using R package lavaan [24] and the software FACTOR [25–27].”
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“Several researchers (e.g., Achenbach, 1978; Muthén & Kaplan, 1985; West et al., 1995) suggest that 4-point Likert data are inherently nonnormal.”
BackgroundFerretti, F., Pozza, A., & Coluccia, A. (2014) · Patient Related Outcome Measures · doi:10.2147/prom.s66500 · Cited by 10
“42 Consistent with Floyd and Widaman’s recommendations, 24 all values of the communalities were greater than 0.50.”
InfluentialMuthén, L. K., & Muthén, B. (2013) · Cited by 10
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“The data had a normal univariate distribution, skewness, and kurtosis values being approximately in the range −1 and+1 (Muthén and Kaplan, 1985) (Table 1).”
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“…robustness of ML estimators to violations of distributional assumptions when the observed variables are discrete (e.g., Boomsma, 1983; Harlow, 1985; Muthén & Kaplan, 1985; Olsson, 1979), pointed out that not much distortion of the ML chi-square, and very little or nonexistent parameter estimate…”
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“However, Bollen (1989) argued that the assumption of multivariate normality need not apply to exogenous variables, and Muthén and Kaplan (1985) showed that maximum likelihood and generalized least squares estimators remain stable with categorical data.”
BackgroundChong, Y. Y., Kwan, J. Y. M., Yau, P. T., Cheng, H. Y., & Chien, W. T. (2023) · Healthcare · doi:10.3390/healthcare11202708 · Cited by 8
Metadata
- Authors
- Muthén, B., & Kaplan, D.
- Affiliations
- University of California, Los Angeles (US)
- Corresponding author
- Muthén, Bengt
- ORCID
- Muthén, Bengt
- Venue
- British Journal of Mathematical and Statistical Psychology
- Publisher
- Wiley
- Published
- 1985-11
- Volume
- 38
- Issue
- 2
- Pages
- 171-189
- ISSN
- 0007-1102 (ISSN-L)
- 2044-8317
- OpenAlex
- W1985442257
- Cited by
- 1,778
- References
- 0
- Citations by year
- 2026: 68 · 2025: 67 · 2024: 84 · 2023: 79 · 2022: 99 · 2021: 97 · 2020: 104 · 2019: 79 · 2018: 68 · 2017: 82 · 2016: 55 · 2015: 73 · 2014: 91 · 2013: 85 · 2012: 72
- FWCI
- 10.44
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- British Journal of Mathematical and Statistical Psychology (publishedVersion)
- Funders
- National Science Foundation
- Topics
- Social Sciences › Decision Sciences › Management Science and Operations Research › Psychometric Methodologies and Testing
- Physical Sciences › Mathematics › Statistics and Probability › Statistical Methods and Bayesian Inference
- Physical Sciences › Mathematics › Statistics and Probability › Statistical Methods and Applications
- Keywords
- factor analysis, Likert scale data, kurtosis, maximum likelihood estimation, generalized least squares, standard error bias
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