Add method for Chi2

[rempsyc]

Add full support for Chi2: closes #258 and closes #309

For independence

library(report)
htest <- chisq.test(mtcars$cyl, mtcars$am)
report(htest)
#> Effect sizes were labelled following Funder's (2019) recommendations.
#> 
#> The Pearson's Chi-squared test of independence between mtcars$cyl and mtcars$am
#> suggests that the effect is statistically significant, and very large (chi2 =
#> 8.74, p = 0.013; Adjusted Cramer's v = 0.46, 95% CI [0.00, 1.00])

For goodness of fit

htest <- chisq.test(table(mtcars$cyl), p = c(0.1, 0.3, 0.6))

report(htest)
#> 
#> 
#> The Chi-squared test for given probabilities / goodness of fit of
#> table(mtcars$cyl) to a distribution of [4: n=3.2, 6: n=9.6, 8: n=19.2] suggests
#> that the effect is statistically significant, and (chi2 = 21.12, p < .001; Fei
#> = 0.27, 95% CI [0.17, 1.00])

htest <- chisq.test(table(c(mtcars$cyl, 2)), p = c(0.25, 0.25, 0.25, 0.25))

report(htest)
#> 
#> 
#> The Chi-squared test for given probabilities / goodness of fit of
#> table(c(mtcars$cyl, 2)) to a uniform distribution suggests that the effect is
#> statistically significant, and (chi2 = 11.48, p = 0.009; Fei = 0.34, 95% CI
#> [0.13, 1.00])

^{Created on 2023-09-23 with reprex v2.0.2}

Note: Fei is missing interpretation at this time but should be fixed following easystats/effectsize#608

[codecov]

Codecov Report

Merging #393 (e519a00) into main (661459b) will increase coverage by 0.29%.
Report is 1 commits behind head on main.
The diff coverage is 100.00%.

❗ Current head e519a00 differs from pull request most recent head 0c74694. Consider uploading reports for the commit 0c74694 to get more accurate results

@@            Coverage Diff             @@
##             main     #393      +/-   ##
==========================================
+ Coverage   73.51%   73.81%   +0.29%     
==========================================
  Files          48       48              
  Lines        3391     3425      +34     
==========================================
+ Hits         2493     2528      +35     
+ Misses        898      897       -1     

Files	Coverage Δ
R/report.htest.R	91.66% <100.00%> (+0.14%)	⬆️
R/report_htest_chi2.R	93.90% <100.00%> (+5.66%)	⬆️

[IndrajeetPatil]

Thanks, @rempsyc!

[rempsyc]

@IndrajeetPatil you're welcome :) I merged this without review before, but now that you are back, feel free to review those changes (or perhaps the thanks was the symbolic approval already hehe)