{"id":73989,"date":"2021-01-28T11:14:30","date_gmt":"2021-01-28T16:14:30","guid":{"rendered":"https:\/\/ibkrcampus.com\/?p=73989"},"modified":"2022-11-21T09:46:59","modified_gmt":"2022-11-21T14:46:59","slug":"financial-data-manipulation-in-dplyr-for-quant-traders","status":"publish","type":"post","link":"https:\/\/www.interactivebrokers.com\/campus\/ibkr-quant-news\/financial-data-manipulation-in-dplyr-for-quant-traders\/","title":{"rendered":"Financial Data Manipulation in dplyr for Quant Traders"},"content":{"rendered":"\n<p>In this post, we\u2019re going to show how a quant trader can manipulate stock price data using the&nbsp;<code>dplyr<\/code>&nbsp;R package.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large is-resized\"><img decoding=\"async\" data-src=\"\/campus\/wp-content\/uploads\/sites\/2\/2021\/01\/dplyr-robot-wealth.png\" alt=\"dplyr\" class=\"wp-image-74020 lazyload\" width=\"130\" height=\"150\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 130px; aspect-ratio: 130\/150;\" \/><\/figure><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-getting-set-up-and-loading-data\">Getting set up and loading data<\/h2>\n\n\n\n<p>Load the&nbsp;<code>dplyr<\/code>&nbsp;package via the&nbsp;<code>tidyverse<\/code>&nbsp;package.<\/p>\n\n\n\n<p style=\"background-color:#fcfcdb;font-size:11px\" class=\"has-background\">if (!require(&#8216;tidyverse&#8217;)) install.packages(&#8216;tidyverse&#8217;)<br>library(tidyverse)<\/p>\n\n\n\n<p>First, load some price data.<\/p>\n\n\n\n<p><code>energystockprices.RDS<\/code>&nbsp;contains a data frame of daily price observations for 3 energy stocks.<\/p>\n\n\n\n<p style=\"background-color:#fcfcdb;font-size:11px\" class=\"has-background\">prices &lt;- readRDS(&#8216;energystockprices.RDS&#8217;)<br>prices<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" data-src=\"https:\/\/robotwealth.com\/wp-content\/uploads\/sites\/2\/2020\/04\/dplyr-for-traders-1.png\" alt=\"Financial Data\" class=\"wp-image-22731 lazyload\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" \/><\/figure><\/div>\n\n\n\n<p>We\u2019ve organised our data so that<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Every column is variable.<\/li><li>Every row is an observation.<\/li><\/ul>\n\n\n\n<p>In this data set:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>We have 13,314 rows in our data frame.<\/li><li>Each row represents a daily price&nbsp;<em>observation<\/em>&nbsp;for a given stock.<\/li><li>For each observation measure the open, high, low and close prices, and the volume traded.<\/li><\/ul>\n\n\n\n<p>This is a very helpful way to structure your price data. We\u2019ll see how we can use the&nbsp;<code>dplyr<\/code>&nbsp;package to manipulate price data for quant analysis.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-the-main-dplyr-verbs\">The main dplyr verbs<\/h2>\n\n\n\n<p>There are 6 main functions to master in dplyr.<\/p>\n\n\n\n<p><code>filter()<\/code>\u00a0picks out observations (rows) by some filter criteria<br><code>arrange()<\/code>\u00a0reorders the observations (rows)<br><code>select()<\/code>\u00a0picks out the variables (columns)<br><code>mutate()<\/code>\u00a0creates new variables (columns) by applying transformations to existing variables<br><code>summarise()<\/code>\u00a0allows you to group and summarise data \u2013 reducing the data into a grouped summary with fewer rows.<\/p>\n\n\n\n<p>Finally, the&nbsp;<code>group_by()<\/code>&nbsp;causes the verbs above to act on a group at a time, rather than the whole dataset.<\/p>\n\n\n\n<p><em>In the next installment, the author will go through 6 main functions to master in dplyr.<\/em><\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><em>Visit Robot Wealth website to read the full article and download code: <a href=\"https:\/\/robotwealth.com\/financial-data-manipulation-in-dplyr-for-quant-traders\/\">https:\/\/robotwealth.com\/financial-data-manipulation-in-dplyr-for-quant-traders\/<\/a><\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Join Robot James for a tutorial on how to manipulate stock price data using the dplyr R package.<\/p>\n","protected":false},"author":421,"featured_media":74008,"comment_status":"closed","ping_status":"open","sticky":true,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[339,343,338,350,341,344,342],"tags":[806,2535,9135,8962,494,487,6591,8596,8594,1045],"contributors-categories":[13676],"class_list":{"0":"post-73989","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-data-science","8":"category-programing-languages","9":"category-ibkr-quant-news","10":"category-quant-asia-pacific","11":"category-quant-development","12":"category-quant-regions","13":"category-r-development","14":"tag-data-science","15":"tag-dplyr","16":"tag-financial-data-manipulation","17":"tag-math","18":"tag-quant","19":"tag-r","20":"tag-rstats","21":"tag-tidy-financial-data","22":"tag-tidyr","23":"tag-tidyverse","24":"contributors-categories-robot-wealth"},"pp_statuses_selecting_workflow":false,"pp_workflow_action":"current","pp_status_selection":"publish","acf":[],"yoast_head":"<!-- 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