{"id":15407,"date":"2020-03-21T11:29:58","date_gmt":"2020-03-21T10:29:58","guid":{"rendered":"https:\/\/www.datanovia.com\/en\/?p=15407"},"modified":"2020-03-21T11:37:01","modified_gmt":"2020-03-21T10:37:01","slug":"how-to-perform-multiple-t-test-in-r-for-different-variables","status":"publish","type":"post","link":"https:\/\/www.datanovia.com\/en\/blog\/how-to-perform-multiple-t-test-in-r-for-different-variables\/","title":{"rendered":"How to Perform Multiple T-test in R for Different Variables"},"content":{"rendered":"<div class=\"rdoc\">\n<h2 id=\"prerequisites\">Prerequisites<\/h2>\n<pre class=\"r\"><code># Load required R packages\r\nlibrary(tidyverse)\r\nlibrary(rstatix)\r\nlibrary(ggpubr)\r\n   \r\n# Prepare the data and inspect a random sample of the data\r\nmydata &lt;- iris %&gt;%\r\n  filter(Species != \"setosa\") %&gt;%\r\n  as_tibble()\r\nmydata %&gt;% sample_n(6)<\/code><\/pre>\n<pre><code>## # A tibble: 6 x 5\r\n##   Sepal.Length Sepal.Width Petal.Length Petal.Width Species   \r\n##          &lt;dbl&gt;       &lt;dbl&gt;        &lt;dbl&gt;       &lt;dbl&gt; &lt;fct&gt;     \r\n## 1          6.4         2.8          5.6         2.1 virginica \r\n## 2          5.5         2.6          4.4         1.2 versicolor\r\n## 3          6.3         3.4          5.6         2.4 virginica \r\n## 4          6.9         3.1          5.1         2.3 virginica \r\n## 5          6.5         2.8          4.6         1.5 versicolor\r\n## 6          6.3         3.3          6           2.5 virginica<\/code><\/pre>\n<pre class=\"r\"><code># Transform the data into long format\r\n# Put all variables in the same column except `Species`, the grouping variable\r\nmydata.long &lt;- mydata %&gt;%\r\n  pivot_longer(-Species, names_to = \"variables\", values_to = \"value\")\r\nmydata.long %&gt;% sample_n(6)<\/code><\/pre>\n<pre><code>## # A tibble: 6 x 3\r\n##   Species    variables    value\r\n##   &lt;fct&gt;      &lt;chr&gt;        &lt;dbl&gt;\r\n## 1 virginica  Sepal.Length   6.9\r\n## 2 virginica  Sepal.Length   7.6\r\n## 3 versicolor Sepal.Width    3  \r\n## 4 virginica  Petal.Width    2.5\r\n## 5 versicolor Petal.Width    1.3\r\n## 6 virginica  Petal.Width    1.8<\/code><\/pre>\n<h2 id=\"run-multiple-t-tests\">Run multiple T-tests<\/h2>\n<ul>\n<li>Group the data by variables and compare Species groups<\/li>\n<li>Adjust the p-values and add significance levels<\/li>\n<\/ul>\n<pre class=\"r\"><code>stat.test &lt;- mydata.long %&gt;%\r\n  group_by(variables) %&gt;%\r\n  t_test(value ~ Species) %&gt;%\r\n  adjust_pvalue(method = \"BH\") %&gt;%\r\n  add_significance()\r\nstat.test<\/code><\/pre>\n<pre><code>## # A tibble: 4 x 11\r\n##   variables    .y.   group1     group2       n1    n2 statistic    df        p    p.adj p.adj.signif\r\n##   &lt;chr&gt;        &lt;chr&gt; &lt;chr&gt;      &lt;chr&gt;     &lt;int&gt; &lt;int&gt;     &lt;dbl&gt; &lt;dbl&gt;    &lt;dbl&gt;    &lt;dbl&gt; &lt;chr&gt;       \r\n## 1 Petal.Length value versicolor virginica    50    50    -12.6   95.6 4.90e-22 9.80e-22 ****        \r\n## 2 Petal.Width  value versicolor virginica    50    50    -14.6   89.0 2.11e-25 8.44e-25 ****        \r\n## 3 Sepal.Length value versicolor virginica    50    50     -5.63  94.0 1.87e- 7 2.49e- 7 ****        \r\n## 4 Sepal.Width  value versicolor virginica    50    50     -3.21  97.9 1.82e- 3 1.82e- 3 **<\/code><\/pre>\n<h2 id=\"create-multi-panel-boxplots-with-t-test-p-values\">Create multi-panel Boxplots with t-test p-values<\/h2>\n<pre class=\"r\"><code># Create the plot\r\nmyplot &lt;- ggboxplot(\r\n  mydata.long, x = \"Species\", y = \"value\",\r\n  fill = \"Species\", palette = \"npg\", legend = \"none\",\r\n  ggtheme = theme_pubr(border = TRUE)\r\n  ) +\r\n  facet_wrap(~variables)\r\n# Add statistical test p-values\r\nstat.test &lt;- stat.test %&gt;% add_xy_position(x = \"Species\")\r\nmyplot + stat_pvalue_manual(stat.test, label = \"p.adj.signif\")<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/i.imgur.com\/zEtuQzg.png\" alt=\"plot of chunk multiple-t-test-in-r-multi-panel-boxplots\" \/><\/p>\n<h2 id=\"create-individual-box-plots-with-t-test-p-values\">Create individual Box plots with t-test p-values<\/h2>\n<pre class=\"r\"><code># Group the data by variables and do a graph for each variable\r\ngraphs &lt;- mydata.long %&gt;%\r\n  group_by(variables) %&gt;%\r\n  doo(\r\n    ~ggboxplot(\r\n      data =., x = \"Species\", y = \"value\",\r\n      fill = \"Species\", palette = \"npg\", legend = \"none\",\r\n      ggtheme = theme_pubr()\r\n      ), \r\n    result = \"plots\"\r\n  )\r\ngraphs<\/code><\/pre>\n<pre><code>## # A tibble: 4 x 2\r\n##   variables    plots \r\n##   &lt;chr&gt;        &lt;list&gt;\r\n## 1 Petal.Length &lt;gg&gt;  \r\n## 2 Petal.Width  &lt;gg&gt;  \r\n## 3 Sepal.Length &lt;gg&gt;  \r\n## 4 Sepal.Width  &lt;gg&gt;<\/code><\/pre>\n<pre class=\"r\"><code># Add statitistical tests to each corresponding plot\r\nvariables &lt;- graphs$variables\r\nfor(i in 1:length(variables)){\r\n  graph.i &lt;- graphs$plots[[i]] + \r\n    labs(title = variables[i]) +\r\n    stat_pvalue_manual(stat.test[i, ], label = \"p.adj.signif\")\r\n  print(graph.i)\r\n}<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/i.imgur.com\/0DmqjZ6.png\" alt=\"plot of chunk multiple-t-test-in-r-individual-boxplot\" \/><img decoding=\"async\" src=\"https:\/\/i.imgur.com\/5J9y8YV.png\" alt=\"plot of chunk multiple-t-test-in-r-individual-boxplot\" \/><img decoding=\"async\" src=\"https:\/\/i.imgur.com\/NpkmWB0.png\" alt=\"plot of chunk multiple-t-test-in-r-individual-boxplot\" \/><img decoding=\"async\" src=\"https:\/\/i.imgur.com\/CtVbouy.png\" alt=\"plot of chunk multiple-t-test-in-r-individual-boxplot\" \/><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Prerequisites # Load required R packages library(tidyverse) library(rstatix) library(ggpubr) # Prepare the data and inspect a random sample of the data mydata &lt;- iris %&gt;% filter(Species != &#8220;setosa&#8221;) %&gt;% as_tibble() [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":15404,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"rating_form_position":"","rating_results_position":"","mr_structured_data_type":"","footnotes":""},"categories":[341],"tags":[343,355],"class_list":["post-15407","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-faq","tag-ggpubr","tag-r-stats"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to Perform Multiple T-test in R for Different Variables - Datanovia<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.datanovia.com\/en\/blog\/how-to-perform-multiple-t-test-in-r-for-different-variables\/\" 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