{"id":19911,"date":"2022-11-08T02:54:05","date_gmt":"2022-11-07T21:24:05","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-find-a-function-to-return-value-based-on-condition-using-r\/"},"modified":"2022-11-08T02:54:05","modified_gmt":"2022-11-07T21:24:05","slug":"solved-find-a-function-to-return-value-based-on-condition-using-r","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-find-a-function-to-return-value-based-on-condition-using-r\/","title":{"rendered":"[Solved] Find a function to return value based on condition using R"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-33542343\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"33542343\" data-parentid=\"33538425\" data-score=\"1\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>If I understand well, your requirement is to compare sold quantity in month t with the sum of quantity sold in months t-1 and t-2. If so, I can suggest using dplyr package that offer the nice feature of grouping rows and mutating columns in your data frame.<\/p>\n<pre><code>resultData &lt;- group_by(data, KId) %&gt;% \n    arrange(sales_month) %&gt;% \n    mutate(monthMinus1Qty = lag(quantity_sold,1), monthMinus2Qty = lag(quantity_sold, 2)) %&gt;% \n    group_by(KId, sales_month) %&gt;%\n    mutate(previous2MonthsQty = sum(monthMinus1Qty, monthMinus2Qty, na.rm = TRUE)) %&gt;%  \n    mutate(result = ifelse(quantity_sold\/previous2MonthsQty &gt;= 0.6,0,1)) %&gt;%\n    select(KId,sales_month, quantity_sold, result)\n<\/code><\/pre>\n<p>The result is as below:<br \/>\n<a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/jassweb.com\/solved\/wp-content\/uploads\/2022\/11\/Solved-Find-a-function-to-return-value-based-on-condition.png\"><img decoding=\"async\" src=\"https:\/\/jassweb.com\/solved\/wp-content\/uploads\/2022\/11\/Solved-Find-a-function-to-return-value-based-on-condition.png\" alt=\"example of data frame processed by the above code\"><\/a><\/p>\n<p>Adding <\/p>\n<pre><code>select(KId,sales_month, quantity_sold, result)\n<\/code><\/pre>\n<p>at the end let us display only columns we care about (and not all these intermediate steps).<\/p>\n<p>I believe this should satisfy your requirement. NA is the result column are due to 0\/0 division or no data at all for the previous months.<br \/>\nShould you need to expand your calculation beyond one calendar year, you can add year column and adjust group_by() arguments appropriately.<br \/>\nFor more information on dplyr package, follow <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/cran.rstudio.com\/web\/packages\/dplyr\/vignettes\/introduction.html\">this link<\/a><\/p>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">3<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Find a function to return value based on condition using R <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] If I understand well, your requirement is to compare sold quantity in month t with the sum of quantity sold in months t-1 and t-2. If so, I can suggest using dplyr package that offer the nice feature of grouping rows and mutating columns in your data frame. resultData &lt;- group_by(data, KId) %&gt;% arrange(sales_month) &#8230; <a title=\"[Solved] Find a function to return value based on condition using R\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-find-a-function-to-return-value-based-on-condition-using-r\/\" aria-label=\"More on [Solved] Find a function to return value based on condition using R\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[321],"class_list":["post-19911","post","type-post","status-publish","format-standard","hentry","category-solved","tag-r"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Find a function to return value based on condition using R - JassWeb<\/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:\/\/jassweb.com\/solved\/solved-find-a-function-to-return-value-based-on-condition-using-r\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Find a function to return value based on condition using R - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] If I understand well, your requirement is to compare sold quantity in month t with the sum of quantity sold in months t-1 and t-2. 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