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README.md
In EFAtools: Fast and Flexible Implementations of Exploratory Factor Analysis Tools
EFAtools
The EFAtools package provides functions to perform exploratory factor
analysis (EFA) procedures and compare their solutions. The goal is to
provide state-of-the-art factor retention methods and a high degree of
flexibility in the EFA procedures. This way, implementations from R
psych and SPSS can be compared. Moreover, functions for Schmid-Leiman
transformation, and computation of omegas are provided. To speed up the
analyses, some of the iterative procedures like principal axis factoring
(PAF) are implemented in C++.
Installation
You can install the release version from
CRAN with:
install.packages("EFAtools")
You can install the development version from
GitHub with:
install.packages("devtools")
devtools::install_github("mdsteiner/EFAtools")
To also build the vignette when installing the development version, use:
install.packages("devtools")
devtools::install_github("mdsteiner/EFAtools", build_vignettes = TRUE)
Example
Here are a few examples on how to perform the analyses with the
different types and how to compare the results using the COMPARE
function. For more details, see the vignette by running
vignette("EFAtools", package = "EFAtools"). The vignette provides a
high-level introduction into the functionalities of the package.
# load the package
library(EFAtools)
# Run all possible factor retention methods
N_FACTORS(test_models$baseline$cormat, N = 500, method = "ML")
#> Warning in N_FACTORS(test_models$baseline$cormat, N = 500, method = "ML"): ! 'x' was a correlation matrix but CD needs raw data. Skipping CD.
#> (*) <U+0001F3C3> ( ) ( ) ( ) ( ) ( ) Running EKC (*) (*) <U+0001F3C3> ( ) ( ) ( ) ( ) Running HULL (*) (*) (*) <U+0001F3C3> ( ) ( ) ( ) Running KGC (*) (*) (*) (*) <U+0001F3C3> ( ) ( ) Running PARALLEL (*) (*) (*) (*) (*) <U+0001F3C3> ( ) Running SCREE (*) (*) (*) (*) (*) (*) <U+0001F3C3> Running SMT (*) (*) (*) (*) (*) (*) (*) Done!
#>
#> -- Tests for the suitability of the data for factor analysis -------------------
#>
#> Bartlett's test of sphericity
#>
#> v The Bartlett's test of sphericity was significant at an alpha level of .05.
#> These data are probably suitable for factor analysis.
#>
#> <U+0001D712>²(153) = 2173.28, p < .001
#>
#> Kaiser-Meyer-Olkin criterion (KMO)
#>
#> v The overall KMO value for your data is marvellous with 0.916.
#> These data are probably suitable for factor analysis.
#>
#> -- Number of factors suggested by the different factor retention criteria ------
#>
#> ( ) Comparison data: NA
#> ( ) Empirical Kaiser criterion: 2
#> ( ) Hull method with CAF: 3
#> ( ) Hull method with CFI: 1
#> ( ) Hull method with RMSEA: 1
#> ( ) Kaiser-Guttman criterion with PCA: 3
#> ( ) Kaiser-Guttman criterion with SMC: 1
#> ( ) Kaiser-Guttman criterion with EFA: 1
#> ( ) Parallel analysis with PCA: 3
#> ( ) Parallel analysis with SMC: 3
#> ( ) Parallel analysis with EFA: 3
#> ( ) Sequential <U+0001D712>² model tests: 3
#> ( ) Lower bound of RMSEA 90% confidence interval: 2
#> ( ) Akaike Information Criterion: 3
# A type SPSS EFA to mimick the SPSS implementation with
# promax rotation
EFA_SPSS <- EFA(test_models$baseline$cormat, n_factors = 3, type = "SPSS",
rotation = "promax")
# look at solution
EFA_SPSS
#>
#> EFA performed with type = 'SPSS', method = 'PAF', and rotation = 'promax'.
#>
#> -- Rotated Loadings ------------------------------------------------------------
#>
#> F1 F2 F3
#> V1 -.048 .035 .613
#> V2 -.001 .067 .482
#> V3 .060 .056 .453
#> V4 .101 -.009 .551
#> V5 .157 -.018 .438
#> V6 -.072 -.049 .704
#> V7 .001 .533 .093
#> V8 -.016 .581 .030
#> V9 .038 .550 -.001
#> V10 -.022 .674 -.071
#> V11 .015 .356 .232
#> V12 .020 .651 -.010
#> V13 .614 .086 -.067
#> V14 .548 -.068 .088
#> V15 .561 .128 -.070
#> V16 .555 -.050 .091
#> V17 .664 -.037 -.027
#> V18 .555 .004 .050
#>
#> -- Factor Intercorrelations ----------------------------------------------------
#>
#> F1 F2 F3
#> F1 1.000 0.617 0.648
#> F2 0.617 1.000 0.632
#> F3 0.648 0.632 1.000
#>
#> -- Variances Accounted for -----------------------------------------------------
#>
#> F1 F2 F3
#> SS loadings 4.907 0.757 0.643
#> Prop Tot Var 0.273 0.042 0.036
#> Cum Prop Tot Var 0.273 0.315 0.350
#> Prop Comm Var 0.778 0.120 0.102
#> Cum Prop Comm Var 0.778 0.898 1.000
#>
#> -- Model Fit -------------------------------------------------------------------
#>
#> CAF: .50
#> df: 102
# A type psych EFA to mimick the psych::fa() implementation with
# promax rotation
EFA_psych <- EFA(test_models$baseline$cormat, n_factors = 3, type = "psych",
rotation = "promax")
# compare the type psych and type SPSS implementations
COMPARE(EFA_SPSS$rot_loadings, EFA_psych$rot_loadings,
x_labels = c("SPSS", "psych"))
#> Mean [min, max] absolute difference: 0.0090 [ 0.0001, 0.0245]
#> Median absolute difference: 0.0095
#> Max decimals where all numbers are equal: 0
#> Minimum number of decimals provided: 17
#>
#> F1 F2 F3
#> V1 0.0150 0.0142 -0.0195
#> V2 0.0109 0.0109 -0.0138
#> V3 0.0095 0.0103 -0.0119
#> V4 0.0118 0.0131 -0.0154
#> V5 0.0084 0.0105 -0.0109
#> V6 0.0183 0.0169 -0.0245
#> V7 -0.0026 -0.0017 0.0076
#> V8 -0.0043 -0.0035 0.0102
#> V9 -0.0055 -0.0040 0.0117
#> V10 -0.0075 -0.0066 0.0151
#> V11 0.0021 0.0029 0.0001
#> V12 -0.0064 -0.0050 0.0136
#> V13 -0.0109 -0.0019 0.0163
#> V14 -0.0049 0.0028 0.0070
#> V15 -0.0107 -0.0023 0.0161
#> V16 -0.0051 0.0028 0.0074
#> V17 -0.0096 -0.0001 0.0136
#> V18 -0.0066 0.0014 0.0098
# Average solution across many different EFAs with oblique rotations
EFA_AV <- EFA_AVERAGE(test_models$baseline$cormat, n_factors = 3, N = 500,
method = c("PAF", "ML", "ULS"), rotation = "oblique",
show_progress = FALSE)
# look at solution
EFA_AV
#>
#> Averaging performed with averaging method mean (trim = 0) across 162 EFAs, varying the following settings: method, init_comm, criterion_type, start_method, rotation, k_promax, P_type, and varimax_type.
#>
#> The error rate is at 0%. Of the solutions that did not result in an error, 100% converged, 0% contained Heywood cases, and 100% were admissible.
#>
#>
#> == Indicator-to-Factor Correspondences =========================================
#>
#> For each cell, the proportion of solutions including the respective indicator-to-factor correspondence. A salience threshold of 0.3 was used to determine indicator-to-factor correspondences.
#>
#> F1 F2 F3
#> V1 .11 .00 1.00
#> V2 .11 .00 1.00
#> V3 .11 .00 .94
#> V4 .11 .00 1.00
#> V5 .11 .00 .94
#> V6 .11 .00 1.00
#> V7 .11 .94 .00
#> V8 .11 1.00 .00
#> V9 .11 .94 .00
#> V10 .11 1.00 .00
#> V11 .11 .89 .00
#> V12 .11 1.00 .00
#> V13 1.00 .00 .00
#> V14 1.00 .00 .00
#> V15 1.00 .00 .00
#> V16 1.00 .00 .00
#> V17 1.00 .00 .00
#> V18 1.00 .00 .00
#>
#>
#> == Loadings ====================================================================
#>
#> -- Mean ------------------------------------------------------------------------
#>
#> F1 F2 F3
#> V1 .025 .048 .576
#> V2 .060 .077 .451
#> V3 .115 .066 .425
#> V4 .157 .007 .518
#> V5 .198 -.002 .412
#> V6 .002 -.028 .658
#> V7 .074 .497 .102
#> V8 .056 .538 .046
#> V9 .100 .510 .018
#> V10 .048 .625 -.046
#> V11 .082 .336 .228
#> V12 .094 .606 .007
#> V13 .597 .083 -.047
#> V14 .531 -.056 .093
#> V15 .548 .122 -.049
#> V16 .540 -.041 .097
#> V17 .633 -.033 -.009
#> V18 .542 .009 .060
#>
#> -- Range -----------------------------------------------------------------------
#>
#> F1 F2 F3
#> V1 0.513 0.086 0.239
#> V2 0.431 0.093 0.186
#> V3 0.394 0.108 0.179
#> V4 0.415 0.110 0.214
#> V5 0.315 0.122 0.177
#> V6 0.514 0.104 0.267
#> V7 0.527 0.255 0.089
#> V8 0.520 0.275 0.078
#> V9 0.470 0.276 0.080
#> V10 0.533 0.313 0.097
#> V11 0.482 0.176 0.102
#> V12 0.548 0.324 0.103
#> V13 0.081 0.289 0.114
#> V14 0.063 0.220 0.117
#> V15 0.091 0.280 0.107
#> V16 0.072 0.230 0.122
#> V17 0.108 0.270 0.124
#> V18 0.081 0.246 0.118
#>
#>
#> == Factor Intercorrelations from Oblique Solutions =============================
#>
#> -- Mean ------------------------------------------------------------------------
#>
#> F1 F2 F3
#> F1 1.000 0.431 0.518
#> F2 0.431 1.000 0.454
#> F3 0.518 0.454 1.000
#>
#> -- Range -----------------------------------------------------------------------
#>
#> F1 F2 F3
#> F1 0.000 1.276 0.679
#> F2 1.276 0.000 1.316
#> F3 0.679 1.316 0.000
#>
#>
#> == Variances Accounted for =====================================================
#>
#> -- Mean ------------------------------------------------------------------------
#>
#> F1 F2 F3
#> SS loadings 2.443 1.929 1.904
#> Prop Tot Var 0.136 0.107 0.106
#> Prop Comm Var 0.389 0.307 0.303
#>
#> -- Range -----------------------------------------------------------------------
#>
#> F1 F2 F3
#> SS loadings 2.831 1.356 1.291
#> Prop Tot Var 0.157 0.075 0.072
#> Prop Comm Var 0.419 0.215 0.215
#>
#>
#> == Model Fit ===================================================================
#>
#> M (SD) [Min; Max]
#> <U+0001D712>²: 101.73 (34.62) [53.23; 125.98]
#> df: 102
#> p: .369 (.450) [.054; 1.000]
#> CFI: 1.00 (.00) [1.00; 1.00]
#> RMSEA: .01 (.01) [.00; .02]
#> AIC: -102.27 (34.62) [-150.77; -78.02]
#> BIC: -532.16 (34.62) [-580.66; -507.91]
#> CAF: .50 (.00) [.50; .50]
# Perform a Schmid-Leiman transformation
SL <- SL(EFA_psych)
# Based on a specific salience threshold for the loadings (here: .20):
factor_corres <- SL$sl[, c("F1", "F2", "F3")] >= .2
# Compute omegas from the Schmid-Leiman solution
OMEGA(SL, factor_corres = factor_corres)
#> Omega total, omega hierarchical, and omega subscale for the general factor (top row) and the group factors:
#>
#> tot hier sub
#> g 0.883 0.750 0.122
#> F1 0.769 0.498 0.272
#> F2 0.764 0.494 0.270
#> F3 0.745 0.543 0.202
Citation
If you use this package in your research, please acknowledge it by
citing:
Steiner, M.D., & Grieder, S.G. (2020). EFAtools: An R package with fast
and flexible implementations of exploratory factor analysis tools.
Journal of Open Source Software, 5(53), 2521.
https://doi.org/10.21105/joss.02521
Contribute or Report Bugs
If you want to contribute or report bugs, please open an issue on GitHub
or email us at markus.d.steiner@gmail.com or
silvia.grieder@gmail.com.
Try the EFAtools package in your browser
Any scripts or data that you put into this service are public.
EFAtools documentation built on Jan. 6, 2023, 5:16 p.m.
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EFAtools
The EFAtools package provides functions to perform exploratory factor analysis (EFA) procedures and compare their solutions. The goal is to provide state-of-the-art factor retention methods and a high degree of flexibility in the EFA procedures. This way, implementations from R psych and SPSS can be compared. Moreover, functions for Schmid-Leiman transformation, and computation of omegas are provided. To speed up the analyses, some of the iterative procedures like principal axis factoring (PAF) are implemented in C++.
Installation
You can install the release version from CRAN with:
install.packages("EFAtools")
You can install the development version from GitHub with:
install.packages("devtools")
devtools::install_github("mdsteiner/EFAtools")
To also build the vignette when installing the development version, use:
install.packages("devtools")
devtools::install_github("mdsteiner/EFAtools", build_vignettes = TRUE)
Example
Here are a few examples on how to perform the analyses with the
different types and how to compare the results using the COMPARE
function. For more details, see the vignette by running
vignette("EFAtools", package = "EFAtools"). The vignette provides a
high-level introduction into the functionalities of the package.
# load the package
library(EFAtools)
# Run all possible factor retention methods
N_FACTORS(test_models$baseline$cormat, N = 500, method = "ML")
#> Warning in N_FACTORS(test_models$baseline$cormat, N = 500, method = "ML"): ! 'x' was a correlation matrix but CD needs raw data. Skipping CD.
#> (*) <U+0001F3C3> ( ) ( ) ( ) ( ) ( ) Running EKC (*) (*) <U+0001F3C3> ( ) ( ) ( ) ( ) Running HULL (*) (*) (*) <U+0001F3C3> ( ) ( ) ( ) Running KGC (*) (*) (*) (*) <U+0001F3C3> ( ) ( ) Running PARALLEL (*) (*) (*) (*) (*) <U+0001F3C3> ( ) Running SCREE (*) (*) (*) (*) (*) (*) <U+0001F3C3> Running SMT (*) (*) (*) (*) (*) (*) (*) Done!
#>
#> -- Tests for the suitability of the data for factor analysis -------------------
#>
#> Bartlett's test of sphericity
#>
#> v The Bartlett's test of sphericity was significant at an alpha level of .05.
#> These data are probably suitable for factor analysis.
#>
#> <U+0001D712>²(153) = 2173.28, p < .001
#>
#> Kaiser-Meyer-Olkin criterion (KMO)
#>
#> v The overall KMO value for your data is marvellous with 0.916.
#> These data are probably suitable for factor analysis.
#>
#> -- Number of factors suggested by the different factor retention criteria ------
#>
#> ( ) Comparison data: NA
#> ( ) Empirical Kaiser criterion: 2
#> ( ) Hull method with CAF: 3
#> ( ) Hull method with CFI: 1
#> ( ) Hull method with RMSEA: 1
#> ( ) Kaiser-Guttman criterion with PCA: 3
#> ( ) Kaiser-Guttman criterion with SMC: 1
#> ( ) Kaiser-Guttman criterion with EFA: 1
#> ( ) Parallel analysis with PCA: 3
#> ( ) Parallel analysis with SMC: 3
#> ( ) Parallel analysis with EFA: 3
#> ( ) Sequential <U+0001D712>² model tests: 3
#> ( ) Lower bound of RMSEA 90% confidence interval: 2
#> ( ) Akaike Information Criterion: 3
# A type SPSS EFA to mimick the SPSS implementation with
# promax rotation
EFA_SPSS <- EFA(test_models$baseline$cormat, n_factors = 3, type = "SPSS",
rotation = "promax")
# look at solution
EFA_SPSS
#>
#> EFA performed with type = 'SPSS', method = 'PAF', and rotation = 'promax'.
#>
#> -- Rotated Loadings ------------------------------------------------------------
#>
#> F1 F2 F3
#> V1 -.048 .035 .613
#> V2 -.001 .067 .482
#> V3 .060 .056 .453
#> V4 .101 -.009 .551
#> V5 .157 -.018 .438
#> V6 -.072 -.049 .704
#> V7 .001 .533 .093
#> V8 -.016 .581 .030
#> V9 .038 .550 -.001
#> V10 -.022 .674 -.071
#> V11 .015 .356 .232
#> V12 .020 .651 -.010
#> V13 .614 .086 -.067
#> V14 .548 -.068 .088
#> V15 .561 .128 -.070
#> V16 .555 -.050 .091
#> V17 .664 -.037 -.027
#> V18 .555 .004 .050
#>
#> -- Factor Intercorrelations ----------------------------------------------------
#>
#> F1 F2 F3
#> F1 1.000 0.617 0.648
#> F2 0.617 1.000 0.632
#> F3 0.648 0.632 1.000
#>
#> -- Variances Accounted for -----------------------------------------------------
#>
#> F1 F2 F3
#> SS loadings 4.907 0.757 0.643
#> Prop Tot Var 0.273 0.042 0.036
#> Cum Prop Tot Var 0.273 0.315 0.350
#> Prop Comm Var 0.778 0.120 0.102
#> Cum Prop Comm Var 0.778 0.898 1.000
#>
#> -- Model Fit -------------------------------------------------------------------
#>
#> CAF: .50
#> df: 102
# A type psych EFA to mimick the psych::fa() implementation with
# promax rotation
EFA_psych <- EFA(test_models$baseline$cormat, n_factors = 3, type = "psych",
rotation = "promax")
# compare the type psych and type SPSS implementations
COMPARE(EFA_SPSS$rot_loadings, EFA_psych$rot_loadings,
x_labels = c("SPSS", "psych"))
#> Mean [min, max] absolute difference: 0.0090 [ 0.0001, 0.0245]
#> Median absolute difference: 0.0095
#> Max decimals where all numbers are equal: 0
#> Minimum number of decimals provided: 17
#>
#> F1 F2 F3
#> V1 0.0150 0.0142 -0.0195
#> V2 0.0109 0.0109 -0.0138
#> V3 0.0095 0.0103 -0.0119
#> V4 0.0118 0.0131 -0.0154
#> V5 0.0084 0.0105 -0.0109
#> V6 0.0183 0.0169 -0.0245
#> V7 -0.0026 -0.0017 0.0076
#> V8 -0.0043 -0.0035 0.0102
#> V9 -0.0055 -0.0040 0.0117
#> V10 -0.0075 -0.0066 0.0151
#> V11 0.0021 0.0029 0.0001
#> V12 -0.0064 -0.0050 0.0136
#> V13 -0.0109 -0.0019 0.0163
#> V14 -0.0049 0.0028 0.0070
#> V15 -0.0107 -0.0023 0.0161
#> V16 -0.0051 0.0028 0.0074
#> V17 -0.0096 -0.0001 0.0136
#> V18 -0.0066 0.0014 0.0098
# Average solution across many different EFAs with oblique rotations
EFA_AV <- EFA_AVERAGE(test_models$baseline$cormat, n_factors = 3, N = 500,
method = c("PAF", "ML", "ULS"), rotation = "oblique",
show_progress = FALSE)
# look at solution
EFA_AV
#>
#> Averaging performed with averaging method mean (trim = 0) across 162 EFAs, varying the following settings: method, init_comm, criterion_type, start_method, rotation, k_promax, P_type, and varimax_type.
#>
#> The error rate is at 0%. Of the solutions that did not result in an error, 100% converged, 0% contained Heywood cases, and 100% were admissible.
#>
#>
#> == Indicator-to-Factor Correspondences =========================================
#>
#> For each cell, the proportion of solutions including the respective indicator-to-factor correspondence. A salience threshold of 0.3 was used to determine indicator-to-factor correspondences.
#>
#> F1 F2 F3
#> V1 .11 .00 1.00
#> V2 .11 .00 1.00
#> V3 .11 .00 .94
#> V4 .11 .00 1.00
#> V5 .11 .00 .94
#> V6 .11 .00 1.00
#> V7 .11 .94 .00
#> V8 .11 1.00 .00
#> V9 .11 .94 .00
#> V10 .11 1.00 .00
#> V11 .11 .89 .00
#> V12 .11 1.00 .00
#> V13 1.00 .00 .00
#> V14 1.00 .00 .00
#> V15 1.00 .00 .00
#> V16 1.00 .00 .00
#> V17 1.00 .00 .00
#> V18 1.00 .00 .00
#>
#>
#> == Loadings ====================================================================
#>
#> -- Mean ------------------------------------------------------------------------
#>
#> F1 F2 F3
#> V1 .025 .048 .576
#> V2 .060 .077 .451
#> V3 .115 .066 .425
#> V4 .157 .007 .518
#> V5 .198 -.002 .412
#> V6 .002 -.028 .658
#> V7 .074 .497 .102
#> V8 .056 .538 .046
#> V9 .100 .510 .018
#> V10 .048 .625 -.046
#> V11 .082 .336 .228
#> V12 .094 .606 .007
#> V13 .597 .083 -.047
#> V14 .531 -.056 .093
#> V15 .548 .122 -.049
#> V16 .540 -.041 .097
#> V17 .633 -.033 -.009
#> V18 .542 .009 .060
#>
#> -- Range -----------------------------------------------------------------------
#>
#> F1 F2 F3
#> V1 0.513 0.086 0.239
#> V2 0.431 0.093 0.186
#> V3 0.394 0.108 0.179
#> V4 0.415 0.110 0.214
#> V5 0.315 0.122 0.177
#> V6 0.514 0.104 0.267
#> V7 0.527 0.255 0.089
#> V8 0.520 0.275 0.078
#> V9 0.470 0.276 0.080
#> V10 0.533 0.313 0.097
#> V11 0.482 0.176 0.102
#> V12 0.548 0.324 0.103
#> V13 0.081 0.289 0.114
#> V14 0.063 0.220 0.117
#> V15 0.091 0.280 0.107
#> V16 0.072 0.230 0.122
#> V17 0.108 0.270 0.124
#> V18 0.081 0.246 0.118
#>
#>
#> == Factor Intercorrelations from Oblique Solutions =============================
#>
#> -- Mean ------------------------------------------------------------------------
#>
#> F1 F2 F3
#> F1 1.000 0.431 0.518
#> F2 0.431 1.000 0.454
#> F3 0.518 0.454 1.000
#>
#> -- Range -----------------------------------------------------------------------
#>
#> F1 F2 F3
#> F1 0.000 1.276 0.679
#> F2 1.276 0.000 1.316
#> F3 0.679 1.316 0.000
#>
#>
#> == Variances Accounted for =====================================================
#>
#> -- Mean ------------------------------------------------------------------------
#>
#> F1 F2 F3
#> SS loadings 2.443 1.929 1.904
#> Prop Tot Var 0.136 0.107 0.106
#> Prop Comm Var 0.389 0.307 0.303
#>
#> -- Range -----------------------------------------------------------------------
#>
#> F1 F2 F3
#> SS loadings 2.831 1.356 1.291
#> Prop Tot Var 0.157 0.075 0.072
#> Prop Comm Var 0.419 0.215 0.215
#>
#>
#> == Model Fit ===================================================================
#>
#> M (SD) [Min; Max]
#> <U+0001D712>²: 101.73 (34.62) [53.23; 125.98]
#> df: 102
#> p: .369 (.450) [.054; 1.000]
#> CFI: 1.00 (.00) [1.00; 1.00]
#> RMSEA: .01 (.01) [.00; .02]
#> AIC: -102.27 (34.62) [-150.77; -78.02]
#> BIC: -532.16 (34.62) [-580.66; -507.91]
#> CAF: .50 (.00) [.50; .50]
# Perform a Schmid-Leiman transformation
SL <- SL(EFA_psych)
# Based on a specific salience threshold for the loadings (here: .20):
factor_corres <- SL$sl[, c("F1", "F2", "F3")] >= .2
# Compute omegas from the Schmid-Leiman solution
OMEGA(SL, factor_corres = factor_corres)
#> Omega total, omega hierarchical, and omega subscale for the general factor (top row) and the group factors:
#>
#> tot hier sub
#> g 0.883 0.750 0.122
#> F1 0.769 0.498 0.272
#> F2 0.764 0.494 0.270
#> F3 0.745 0.543 0.202
Citation
If you use this package in your research, please acknowledge it by citing:
Steiner, M.D., & Grieder, S.G. (2020). EFAtools: An R package with fast and flexible implementations of exploratory factor analysis tools. Journal of Open Source Software, 5(53), 2521. https://doi.org/10.21105/joss.02521
Contribute or Report Bugs
If you want to contribute or report bugs, please open an issue on GitHub or email us at markus.d.steiner@gmail.com or silvia.grieder@gmail.com.
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