{"id":134250,"date":"2022-04-19T11:20:00","date_gmt":"2022-04-19T15:20:00","guid":{"rendered":"https:\/\/ibkrcampus.com\/?p=134250"},"modified":"2022-11-21T09:53:43","modified_gmt":"2022-11-21T14:53:43","slug":"how-to-add-calculated-variables-in-r","status":"publish","type":"post","link":"https:\/\/www.interactivebrokers.com\/campus\/ibkr-quant-news\/how-to-add-calculated-variables-in-r\/","title":{"rendered":"How to Add Calculated Variables in R"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">To add new calculated variables to a data frame and remove all old variables, use the transmute() function in R.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The following is the fundamental syntax for this function.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>df %&gt;% transmute(var_new = var1 * 2)<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">In this example, we\u2019ll make a new variable called var new by multiplying an existing variable called var1 by 2.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The examples below demonstrate how to use the transmute() function in R with the following data frame.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Let\u2019s create a data frame<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>df &lt;- data.frame(team=c('A1', 'B1', 'C1', 'D1', 'E1'),\n                 score=c(89, 70, 76, 78, 75))<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Now we can view the data frame<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>df<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>  team score\n1   A1    89\n2   B1    70\n3   C1    76\n4   D1    78\n5   E1    75<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-example-1-create-one-new-variable-using-transmute\">Example 1: Create One New Variable using transmute()<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The following code demonstrates how to create a new variable with transmute():<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>library(dplyr)<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">create a new variable called score1<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>df %&gt;% transmute(score1 = score * 2)<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>   score1\n1    178\n2    140\n3    152\n4    156\n5    150<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">The original values in the score column are multiplied by two to get the score1 values.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It\u2019s worth noting that the transmute() function doesn\u2019t change the original data frame.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">You must save the results of the transmute() method in a variable to save them in a new data frame:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>library(dplyr)<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Transmute results are saved in a variable.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>df$score1&lt;- df %&gt;% transmute(score1 = score * 2)<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">View the results<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>df<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-preformatted\">  team score score1\n1&nbsp;&nbsp; A1&nbsp;&nbsp;&nbsp; 89&nbsp;&nbsp;&nbsp; 178\n2&nbsp;&nbsp; B1&nbsp;&nbsp;&nbsp; 70&nbsp;&nbsp;&nbsp; 140\n3&nbsp;&nbsp; C1&nbsp;&nbsp;&nbsp; 76&nbsp;&nbsp;&nbsp; 152\n4&nbsp;&nbsp; D1&nbsp;&nbsp;&nbsp; 78&nbsp;&nbsp;&nbsp; 156\n5&nbsp;&nbsp; E1&nbsp;&nbsp;&nbsp; 75&nbsp;&nbsp;&nbsp; 150<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">The results of transmute() are now stored in a data frame.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Example 2: Create Multiple New Variables using transmute()<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Transmute() can be used to create several new variables from existing variables, as shown in the following code.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>library(dplyr)<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Let\u2019s create a multiple new variables.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/finnstats.com\/index.php\/2022\/03\/20\/group-wise-correlation-in-r\/\">Group wise Correlation in R \u00bb finnstats<\/a><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>df %&gt;%\n  transmute(\n    score1 = score * 2,\n    scoresquared = score^2,\n    scorehalf = score \/ 2,\n    name= paste0('team_', team)\n  )<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code> score1 scoresquared scorehalf    name\n1    178         7921      44.5 team_A1\n2    140         4900      35.0 team_B1\n3    152         5776      38.0 team_C1\n4    156         6084      39.0 team_D1\n5    150         5625      37.5 team_E1<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Four new variables have been created, as you can see.<a href=\"https:\/\/twitter.com\/intent\/tweet?text=Hey%2C+check+out+this+cool+site+I+found%3A+www.yourname.com+%23Topic+via%40my_twitter_name&amp;url=https%3A%2F%2Ffinnstats.com%2Findex.php%2F2022%2F04%2F12%2Fhow-to-add-calculated-variables-in-r%2F\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Visit FINNSTATS for additional insight on this topic: <a href=\"https:\/\/finnstats.com\/index.php\/2022\/04\/12\/how-to-add-calculated-variables-in-r\/\">https:\/\/finnstats.com\/index.php\/2022\/04\/12\/how-to-add-calculated-variables-in-r\/<\/a>.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>To add new calculated variables to a data frame and remove all old variables, use the transmute() function in R.<\/p>\n","protected":false},"author":186,"featured_media":38256,"comment_status":"closed","ping_status":"open","sticky":true,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[339,343,338,350,341,344,342],"tags":[806,2535,6591,508],"contributors-categories":[13741],"class_list":["post-134250","post","type-post","status-publish","format-standard","has-post-thumbnail","category-data-science","category-programing-languages","category-ibkr-quant-news","category-quant-asia-pacific","category-quant-development","category-quant-regions","category-r-development","tag-data-science","tag-dplyr","tag-rstats","tag-rstudio","contributors-categories-finnstats"],"pp_statuses_selecting_workflow":false,"pp_workflow_action":"current","pp_status_selection":"publish","acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.9 (Yoast SEO v28.0) - 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