Testing for interactions in multivariate data.
The 12 matches · all tie a paragraph to a whole file without given lines: weak matches, whose lines are not tinted
- [1] § Materials and methods › Decoding methods ↔ misc/svm_classify.m, the whole file · a weak match · score 0.68 · Nearest Neighbour, fitcecoc, fitcknn, fitclinear, fitcsvm, classifier · Report a mismatch
- [2] § Materials and methods › Decoding methods ↔ misc/svm_classify_old.m, the whole file · a weak match · score 0.68 · Nearest Neighbour, fitcecoc, fitcknn, fitclinear, fitcsvm, classifier · Report a mismatch
- [3] § Materials and methods › Reward learning ↔ data/get_reward_data.m, the whole file · a weak match · score 0.66 · median split, RPE sign, trajectories, grand, Reward · Report a mismatch
- [4] § Materials and methods › Multivariate linear model with conjugate priors › Likelihood. ↔ linear-regression/bayes_glinear_estimate.m, the whole file · a weak match · score 0.64 · regression coefficients, independent variables, noise, Gaussian, covariance, zero · Report a mismatch
- [5] § Materials and methods › Multivariate linear model with conjugate priors › Likelihood. ↔ linear-regression/bayes_glm_regression.m, the whole file · a weak match · score 0.64 · multivariate Gaussian, independent variables, regression, noise, coefficients, errors · Report a mismatch
- [6] § Materials and methods › Univariate methods ↔ toolbox/plot_anova_map.m, the whole file · a weak match · score 0.62 · Benjamini Hochberg, FDR correction, BH, map, hypotheses · Report a mismatch
- [7] § Materials and methods › Multivariate linear model with conjugate priors › Factorial designs. ↔ linear-regression/bayes_glm_anova1.m, the whole file · a weak match · score 0.60 · way ANOVAs, log Bayes factor, alternative hypothesis, favour, model · Report a mismatch
- [8] § Materials and methods › Univariate methods ↔ toolbox/plot_classifier_results.m, the whole file · a weak match · score 0.58 · Benjamini Hochberg, FDR correction, BH · Report a mismatch
- [9] § Materials and methods › Multivariate linear model with conjugate priors › Factorial designs. ↔ misc/savage_dickey_vector.m, the whole file · a weak match · score 0.58 · Savage Dickey, contrast matrix, posterior · Report a mismatch
- [10] § Materials and methods › Multivariate linear model with conjugate priors › Factorial designs. ↔ linear-regression/bayes_glm_regression.m, the whole file · a weak match · score 0.55 · Savage Dickey, design matrix, fitting, posterior, Bayesian, model · Report a mismatch
- [11] § Materials and methods › Multivariate linear model with conjugate priors › Bayes factors. ↔ misc/savage_dickey_vector.m, the whole file · a weak match · score 0.51 · log Bayes Factor, alternative hypothesis, enforce, probability, posterior · Report a mismatch
- [12] § Materials and methods › Decoding methods ↔ toolbox/plot_classifier_results.m, the whole file · a weak match · score 0.51 · Benjamini Hochberg procedure, classification, FDR · Report a mismatch
Paper
Loaded from Europe PMC by your browser; OSCR does not store it: doi.org · Europe PMC
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The authors' code
MATLAB · 106 lines · 2.9 KB · no license · 2 matches
- function [logBF,glm] = bayes_glm_regression (X,y,method)
- % Bayesian GLM regression
- % FORMAT [logBF,glm] = bayes_glm_regression (X,y,method)
- %
- % X [N x K] Design matrix (Independent Variables).
- % Kth column must be vector of 1's.
- % y [N x 1] Dependent Variable
- % method 'G' Multivariate Gaussian priors and posteriors
- % 'T' Multivariate T (MVT) priors and posteriors
- %
- % Log Bayes Factors in favour of alternative hypothesis:
- % logBF(1) Fit Full and Reduced Model separately (Multi-Fitting)
- % logBF(2) Savage-Dickey
- % logBF(3) Default Bayes Factors
- %
- % glm Linear Model parameters
- %
- % Single variance component assumed
- [N,K] = size(X);
- % Check Kth column is vector of 1's
- d=X(:,K)-ones(N,1);
- if sum(d.^2) > 0
- disp('Error in bayes_glm_regression: last column of design matrix must be column of 1''s.');
- return
- end
- % Centre design matrix - as in Rouder and Morey (2013)
- for p=1:K-1,
- X(:,p)=X(:,p)-mean(X(:,p));
- end
- % Subtract data mean
- my = mean(y);
- vy = std(y)^2;
- y = y-my;
- % Prior precision/variance matrices
- XK = X(:,1:K-1);
- B0 = (XK'*XK)/N;
- B0 = blkdiag(B0,1);
- % Rouder and Morey (2013) set the prior covariance of regression
- % coefficients to be proportional to inv(B0). Hence choice of the
- % above term.
- switch method
- case 'T',
- % Single variance component assumed - intrinsic to MVT prior
- % c0 must be larger than 1 for finite variance
- % 2*c0 is the degrees of freedom of T-prior
- % (c0=1/2 for Cauchy)
- glm.c0=1.1;
- glm.B0=B0;
- glm.w0=zeros(K,1);
- % Scale observation noise level to variance of dependent variable.
- % This then changes scale of prior variance over regression
- % coefficients through T-prior.
- glm.b0 = 1/(glm.c0*vy);
- % Define null model
- glm_null = glm;
- glm_null.w0 = glm.w0(K);
- glm_null.B0 = glm.B0(K,K);
- case 'G',
- glm.pE=zeros(K,1);
- % Single variance component assumed
- glm.Ce=vy*eye(N); % IID Error matrix
- % Scale prior variance by data variability
- C0 = inv(B0);
- glm.pC=vy*C0;
- % Define null model
- glm_null = glm;
- glm_null.pE = glm.pE(K);
- glm_null.pC = glm.pC(K,K);
- otherwise
- disp('Unknown method in bayes_glm_regression.m');
- return
- end
- glm.X = X;
- glm_null.X = glm.X(:,K);
- glm = bayes_linear_estimate (glm,y,method);
- % Savage-Dickey
- c = eye(K);
- logBF(2) = bayes_linear_test (glm,c,method);
- % Fit null model
- glm_null = bayes_linear_estimate (glm_null,y,method);
- logBF(1) = glm.F - glm_null.F;
- % Default Bayes Factor
- R2 = glm.R2;
- bf10 = linregbf(R2,N,K-1);
- logBF(3) = log(bf10);
bayes_glm_regression.m at commit 60e6aff, no license · at the source
Overview
Abstract
Factorial designs are a mainstay of the scientific paradigm, allowing the effects of multiple experimental factors and their interactions to be efficiently studied within a single experiment. In brain imaging, however, multivariate data analyses commonly proceed using multivariate decoding and we argue that the standard “difference of accuracies” test is not a true test of interactions. To remedy this situation we propose an encoding method based on a Bayesian multivariate linear model which is ideally suited to the factorial analysis of such data. We show how it can be used to test for multivariate main effects and interactions using data from EEG studies of reward learning and declarative memory. This approach additionally allows for null hypotheses to be accepted and allows one to infer whether multivariate effects are driven by collections of univariate effects or voxel dependencies. We also propose that those wishing to pursue tests for interactions using decoding methods use an “accuracy of differences” test.
Reproduced under the paper's license (CC BY), from the paper cited above.
Repository
Its files are read in the Code ↔ Paper reader above, with 12 matches between paragraphs and lines of code.
wpennyUEA/MLC
60e6affb5daba82583d309292ef031accf1ad5b1, 17 November 2025Availability: 1 check, the latest on 12 November 2026: the link answers
- 12 November 2026: the link answers
134 files
- confplot/
confidence_plot_test.m , MATLAB, 19 lines - confplot/
confplot.m , MATLAB, 84 lines - data/
gen_heterogeneous_data.m , MATLAB, 135 lines - data/
gen_interaction_data.m , MATLAB, 146 lines - data/
get_DM_data.m , MATLAB, 79 lines - data/
get_reward_data.m , MATLAB, 149 lines, 1 match - data/
get_synth_data.m , MATLAB, 38 lines - linear-regression/
Contents.m , MATLAB, 57 lines - linear-regression/
bayes_glinear_estimate.m , MATLAB, 96 lines, 1 match - linear-regression/
bayes_glinear_test.m , MATLAB, 36 lines - linear-regression/
bayes_glm_anova1.m , MATLAB, 95 lines, 1 match - linear-regression/
bayes_glm_regression.m , MATLAB, 106 lines, 2 matches - linear-regression/
bayes_glm_ttest1.m , MATLAB, 33 lines - linear-regression/
bayes_linear_estimate.m , MATLAB, 40 lines - linear-regression/
bayes_linear_test.m , MATLAB, 34 lines - linear-regression/
bayes_tlinear_estimate.m , MATLAB, 62 lines - linear-regression/
bayes_tlinear_test.m , MATLAB, 37 lines - linear-regression/
default-bayes-factors/ , MATLAB, 48 linesContents.m - linear-regression/
default-bayes-factors/ , MATLAB, 17 linesbinombf.m - linear-regression/
default-bayes-factors/ , MATLAB, 14 linescorrbf.m - linear-regression/
default-bayes-factors/ , MATLAB, 13 linescorrbfrep.m - linear-regression/
default-bayes-factors/ , MATLAB, 23 linest1smpbf.m - linear-regression/
default-bayes-factors/ , MATLAB, 23 linest2smpbf.m - linear-regression/
demo_anova1_chick_weight , MATLAB, 46 liness.m - linear-regression/
demo_anova1_compare.m , MATLAB, 54 lines - linear-regression/
demo_anova1_confounds.m , MATLAB, 38 lines - linear-regression/
demo_glm_test_hypothesis , MATLAB, 37 lines.m - linear-regression/
demo_regression.m , MATLAB, 90 lines - linear-regression/
demo_tlinear.m , MATLAB, 39 lines - linear-regression/
demo_ttest_arbitrary_sca , MATLAB, 50 linesle.m - linear-regression/
demo_ttest_standard_scal , MATLAB, 65 linese.m - linear-regression/
glm_anova1.m , MATLAB, 70 lines - linear-regression/
glm_test_hypothesis.m , MATLAB, 40 lines - linear-regression/
linregbf.m , MATLAB, 38 lines - linear-regression/
linregbf_test.m , MATLAB, 30 lines - linear-regression/
make_anova_design.m , MATLAB, 39 lines - misc/
Contents.m , MATLAB, 31 lines - misc/
auc_ranksum.m , MATLAB, 21 lines - misc/
correlation_entropy_test , MATLAB, 20 lines.m - misc/
demo_svm_classify.m , MATLAB, 17 lines - misc/
gaussian_entropy.m , MATLAB, 11 lines - misc/
get_corr_entropy.m , MATLAB, 26 lines - misc/
line_search.m , MATLAB, 46 lines - misc/
logmvNpdf.m , MATLAB, 40 lines - misc/
logmvNpdf_robust.m , MATLAB, 41 lines - misc/
mci_bernoulli_rnd.m , MATLAB, 12 lines - misc/
mci_logit.m , MATLAB, 7 lines - misc/
mci_sigmoid.m , MATLAB, 7 lines - misc/
mci_smooth.m , MATLAB, 26 lines - misc/
mci_softmax.m , MATLAB, 16 lines - misc/
rdiv.m , MATLAB, 17 lines - misc/
rfx_bms.m , MATLAB, 210 lines - misc/
rsum.m , MATLAB, 10 lines - misc/
savage_dickey_vector.m , MATLAB, 41 lines, 2 matches - misc/
sensitivity_pcut.m , MATLAB, 28 lines - misc/
svm_classify.m , MATLAB, 45 lines, 1 match - misc/
svm_classify_old.m , MATLAB, 115 lines, 1 match - misc/
test_spm_gamrnd.m , MATLAB, 15 lines - misc/
zmuv.m , MATLAB, 17 lines - run_analyses.m, MATLAB, 98 lines
- set_mlc_path.m, MATLAB, 8 lines
- spm-code/
Contents.m , MATLAB, 12 lines - spm-code/
spm_BMS_bor.m , MATLAB, 97 lines - spm-code/
spm_Bcdf.m , MATLAB, 91 lines - spm-code/
spm_Bpdf.m , MATLAB, 92 lines - spm-code/
spm_Dpdf.m , MATLAB, 36 lines - spm-code/
spm_FcUtil.m , MATLAB, 933 lines - spm-code/
spm_Fcdf.m , MATLAB, 119 lines - spm-code/
spm_Gcdf.m , MATLAB, 100 lines - spm-code/
spm_Ncdf.m , MATLAB, 93 lines - spm-code/
spm_Npdf.m , MATLAB, 85 lines - spm-code/
spm_SpUtil.m , MATLAB, 737 lines - spm-code/
spm_ancova.m , MATLAB, 89 lines - spm-code/
spm_cat.c , C, 640 lines - spm-code/
spm_cat.m , MATLAB, 100 lines - spm-code/
spm_cat_struct.m , MATLAB, 42 lines - spm-code/
spm_dctmtx.m , MATLAB, 75 lines - spm-code/
spm_diff.m , MATLAB, 171 lines - spm-code/
spm_dirichlet_exceedance , MATLAB, 63 lines.m - spm-code/
spm_eeg_morlet.m , MATLAB, 51 lines - spm-code/
spm_funcheck.m , MATLAB, 40 lines - spm-code/
spm_gamrnd.c , C, 121 lines - spm-code/
spm_gamrnd.m , MATLAB, 25 lines - spm-code/
spm_inv.m , MATLAB, 30 lines - spm-code/
spm_invBcdf.m , MATLAB, 123 lines - spm-code/
spm_invGcdf.m , MATLAB, 139 lines - spm-code/
spm_invNcdf.m , MATLAB, 105 lines - spm-code/
spm_invXcdf.m , MATLAB, 58 lines - spm-code/
spm_kl_dirichlet.m , MATLAB, 32 lines - spm-code/
spm_kl_eig_normal.m , MATLAB, 32 lines - spm-code/
spm_kl_gamma.m , MATLAB, 20 lines - spm-code/
spm_kl_normal.m , MATLAB, 29 lines - spm-code/
spm_kl_normal_wishart.m , MATLAB, 29 lines - spm-code/
spm_kl_normald.m , MATLAB, 40 lines - spm-code/
spm_kl_wishart.m , MATLAB, 43 lines - spm-code/
spm_length.m , MATLAB, 50 lines - spm-code/
spm_lg_gamma.m , MATLAB, 27 lines - spm-code/
spm_logdet.m , MATLAB, 74 lines - spm-code/
spm_make_contrasts.m , MATLAB, 96 lines - spm-code/
spm_multrnd.m , MATLAB, 19 lines - spm-code/
spm_mvNpdf.m , MATLAB, 70 lines - spm-code/
spm_mvtpdf.m , MATLAB, 30 lines - spm-code/
spm_normrnd.m , MATLAB, 32 lines - spm-code/
spm_nwcov.m , MATLAB, 34 lines - spm-code/
spm_nwpost.m , MATLAB, 45 lines - spm-code/
spm_nwrnd.m , MATLAB, 46 lines - spm-code/
spm_sp.m , MATLAB, 1,415 lines - spm-code/
spm_svd.m , MATLAB, 95 lines - spm-code/
spm_unvec.m , MATLAB, 89 lines - spm-code/
spm_vec.m , MATLAB, 57 lines - spm-code/
spm_wishrnd.m , MATLAB, 42 lines - toolbox/
bayes_manova_period.m , MATLAB, 50 lines - toolbox/
bayes_manova_space_time. , MATLAB, 55 linesm - toolbox/
bayes_manova_time_series , MATLAB, 56 lines.m - toolbox/
classic_manova.m , MATLAB, 47 lines - toolbox/
classic_manova_time_seri , MATLAB, 40 lineses.m - toolbox/
decode_time_series.m , MATLAB, 77 lines - toolbox/
erp_baseline_correct.m , MATLAB, 46 lines - toolbox/
mlm_nw.m , MATLAB, 75 lines - toolbox/
plot_anova_map.m , MATLAB, 83 lines, 1 match - toolbox/
plot_bman_results.m , MATLAB, 49 lines - toolbox/
plot_classifier_results. , MATLAB, 66 lines, 2 matchesm - toolbox/
plot_cman_results.m , MATLAB, 55 lines - toolbox/
plot_condition_means.m , MATLAB, 52 lines - toolbox/
plot_scalp_map.m , MATLAB, 39 lines - toolbox/
plot_scalp_map_details.m , MATLAB, 221 lines - toolbox/
plot_univariate_effects. , MATLAB, 21 linesm - toolbox/
ptm_contrast_range.m , MATLAB, 19 lines - toolbox/
ptm_contrast_time.m , MATLAB, 8 lines - toolbox/
ptm_fit_enc.m , MATLAB, 52 lines - toolbox/
run_classifier.m , MATLAB, 29 lines - toolbox/
spatial_precision_matrix , MATLAB, 26 lines.m - toolbox/
stm_scale_data.m , MATLAB, 21 lines - README.md, Text, 15 lines
The paper's code and data availability statement is in the Data section.
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Proposed by the machine: these links were found in the paper and verified at the source, without human review. The map will receive a Zenodo DOI once one of the paper's authors has validated it with their ORCID.
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Data
No dataset and no data link were found in the paper.
Data Availability
A matlab implementation of MLC is provided in the GitHub archive https://
Reproduced under the paper's license (CC BY), from the paper cited above.
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Version 1, 12 November 2026: the first record
Recorded: type, language, journal, volume, issue, pages, dates, 3 authors, 7 MeSH terms, 2 funders, 48 references.
Cite
This paper
Penny, W., Sambrook, T., & Renoult, L. (2026). Testing for interactions in multivariate data. PloS one, 21(11), e0338580. https://
BibTeX
@article{penny2026testin
author = {Penny, Will and Sambrook, Tom and Renoult, Louis},
title = {{Testing for interactions in multivariate data}},
journal = {PloS one},
year = {2026},
month = nov,
volume = {21},
number = {11},
pages = {e0338580},
publisher = {PLOS},
issn = {1932-6203},
doi = {10.1371/
url = {https://
pmid = {43008059},
pmcid = {PMC13750587}
}
RIS
TY - JOUR
AU - Penny, Will
AU - Sambrook, Tom
AU - Renoult, Louis
TI - Testing for interactions in multivariate data
T2 - PloS one
J2 - PLoS One
PY - 2026
DA - 2026/
VL - 21
IS - 11
SP - e0338580
SN - 1932-6203
PB - PLOS
DO - 10.1371/
UR - https://
LA - en
ER -
CSL-JSON
{
"id": "10.1371/
"type": "article-journal",
"title": "Testing for interactions in multivariate data",
"container-title": "PloS one",
"author": [
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"family": "Penny",
"given": "Will"
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{
"family": "Sambrook",
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{
"family": "Renoult",
"given": "Louis"
}
],
"container-title-short":
"volume": "21",
"issue": "11",
"page": "e0338580",
"DOI": "10.1371/
"PMID": "43008059",
"PMCID": "PMC13750587",
"ISSN": "1932-6203",
"publisher": "PLOS",
"URL": "https://
"language": "en",
"issued": {
"date-parts": [
[
2026,
11,
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]
}
}
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