# JASP

JASP is a free and open-source graphical program for statistical analysis supported by the University of Amsterdam. It is designed to be easy to use, and familiar to users of SPSS. It offers standard analysis procedures in both their classical and Bayesian form[1][2]. JASP generally produces APA style results tables and plots to ease publication. It promotes open science by integration with the Open Science Framework and reproducibility by integrating the analysis settings into the results. The development of JASP is financially supported by several universities and research funds.

Stable release 0.12.1 / April 16, 2020 JASP Github page C++, R, JavaScript Microsoft Windows, Mac OS X and Linux Statistics GNU Affero General Public License jasp-stats.org
JASP screenshot

## Analyses

JASP offers frequentist inference and Bayesian inference on the same statistical models. Frequentist inference uses p-values and confidence intervals to control error rates in the limit of infinite perfect replications. Bayesian inference uses credible intervals and Bayes factors[3][4] to estimate credible parameter values and model evidence given the available data and prior knowledge.

The following analyses are available in JASP:

Analysis Frequentist Bayesian
T-tests: independent, paired, one-sample
Mann-Whitney U and Wilcoxon
Correlation[5]: Pearson, Spearman, and Kendall
Reliability analyses: α, γδ, and ω
ANOVA, ANCOVA, Repeated measures ANOVA and MANOVA
Linear regression
Log-linear regression
Logistic regression
Contingency tables (including Chi-squared test)
Binomial test
Multinomial test
A/B test
Exploratory factor analysis (EFA)
Principal component analysis (PCA)
Confirmatory factor analysis (CFA)
Structural equation modeling (SEM)
Network Analysis
Meta Analysis
Summary Stats[6]

## Modules

1. Summary statistics: Bayesian inference from frequentist summary statistics for t-test, regression, and binomial tests.
2. BAIN: Bayesian informative hypotheses evaluation[7] for t-test, ANOVA, ANCOVA and linear regression.
3. Network: Network Analysis allows the user to analyze the network structure of variables.
4. Meta Analysis: Includes techniques for fixed and random effects analysis, fixed and mixed effects meta-regression, forest and funnel plots, tests for funnel plot asymmetry, trim-and-fill and fail-safe N analysis.
5. Machine Learning: Machine Learning module contains 13 analyses for supervised an unsupervised learning:
6. SEM: Structural equation modeling[8].
7. JAGS module
8. Discover distributions
9. Equivalence testing

## References

1. ^ Wagenmakers EJ, Love J, Marsman M, Jamil T, Ly A, Verhagen J, et al. (February 2018). "Bayesian inference for psychology. Part II: Example applications with JASP". Psychonomic Bulletin & Review. 25 (1): 58–76. doi:10.3758/s13423-017-1323-7. PMC 5862926. PMID 28685272.
2. ^ Love J, Selker R, Verhagen J, Marsman M, Gronau QF, Jamil T, Smira M, Epskamp S, Wil A, Ly A, Matzke D, Wagenmakers EJ, Morey MD, Rouder JN (2015). "Software to Sharpen Your Stats". APS Observer. 28 (3).
3. ^ Quintana DS, Williams DR (June 2018). "Bayesian alternatives for common null-hypothesis significance tests in psychiatry: a non-technical guide using JASP". BMC Psychiatry. 18 (1): 178. doi:10.1186/s12888-018-1761-4. PMC 5991426. PMID 29879931.
4. ^ Brydges CR, Gaeta L (December 2019). "An Introduction to Calculating Bayes Factors in JASP for Speech, Language, and Hearing Research". Journal of Speech, Language, and Hearing Research. 62 (12): 4523–4533. doi:10.1044/2019_JSLHR-H-19-0183. PMID 31830850.
5. ^ Nuzzo RL (December 2017). "An Introduction to Bayesian Data Analysis for Correlations". PM&R. 9 (12): 1278–1282. doi:10.1016/j.pmrj.2017.11.003. PMID 29274678.
6. ^ Ly A, Raj A, Etz A, Marsman M, Gronau QF, Wagenmakers E (2017-05-30). "Bayesian Reanalyses from Summary Statistics: A Guide for Academic Consumers". Open Science Framework.
7. ^ Gu, Xin; Mulder, Joris; Hoijtink, Herbert (2018). "Approximated adjusted fractional Bayes factors: A general method for testing informative hypotheses". British Journal of Mathematical and Statistical Psychology. 71 (2): 229–261. doi:10.1111/bmsp.12110. ISSN 2044-8317. PMID 28857129.
8. ^ Kline, Rex B. (2015-11-03). Principles and Practice of Structural Equation Modeling, Fourth Edition. Guilford Publications. ISBN 9781462523351.