{"id":938,"date":"2005-05-01T12:00:12","date_gmt":"2005-05-01T10:00:12","guid":{"rendered":"http:\/\/www.theusrus.de\/blog\/?p=938"},"modified":"2010-12-23T13:53:09","modified_gmt":"2010-12-23T11:53:09","slug":"the-good-the-bad-52005","status":"publish","type":"post","link":"https:\/\/www.theusrus.de\/blog\/the-good-the-bad-52005\/","title":{"rendered":"The Good & the Bad [5\/2005]"},"content":{"rendered":"
This month’s edition is just perfect to show how NOT to do it!<\/p>\n

The Bad<\/strong> of the month May is from a talk<\/a> by Kurt Hornik given at the compstat 2004 meeting in Prague. It looks like follows:\"\"<\/p>\n

This is the famous barley data used in Bill Cleveland’s Visualizing Data<\/em> many times.<\/p>\n

Well, on a first view we would say it looks good …<\/p>\n

Here is what went wrong with this graphic:<\/p>\n

    \n
  1. Never use areas to display continuous variables. Continuous values should be plotted along an axis as points or other sensible glyphs.<\/li>\n
  2. Use stacked barcharts only for proportions, that add up to a fixed amount (say 100%). Put the least varying class at the bottom of the stack, the more varying clases at the top.<\/li>\n
  3. Avoid ”scale hopping”, i.e. the things that should be compared must be plotted along ONE scale.<\/li>\n<\/ol>\n

    (Not to mention that the legend messes up the colors …)<\/p>\n

    Can you see anything ‘out of line’ in the data?<\/p>\n

    Using the same lattice package in R, we can do much better. Here is the Good<\/strong>:<\/p>\n

    \"\"
    \nNow we use points, and only have one scale for the whole plot … and, aha! Somethings wrong with the field in Morris<\/em>.<\/p>\n

    But talking about this feature and talking about statistical graphics, there is only one very simple and long known plot to display the feature in the data: the Interaction Plot<\/em>.<\/p>\n

    \"\"<\/p>\n

    The feature we spotted in the data is nothing else than an interaction of the factor year<\/em> for the site Morris<\/em>, which is mostly related to a transcription error.<\/p>\n

    Going from the first to the third plot, we more and more focus on the ‘right’ information, and need less ink to draw it, which nicely corresponds to Tufte’s data\/ink ratio<\/em>.<\/p>\n

    Obviously, boxplots<\/em> are another good choice for visualize this kind of data.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

    This month’s edition is just perfect to show how NOT to do it! The Bad of the month May is from a talk by Kurt Hornik given at the compstat 2004 meeting in Prague. It looks like follows: This is the famous barley data used in Bill Cleveland’s Visualizing Data many times. Well, on a […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,5],"tags":[],"class_list":["post-938","post","type-post","status-publish","format-standard","hentry","category-general","category-the-good-the-bad"],"_links":{"self":[{"href":"https:\/\/www.theusrus.de\/blog\/wp-json\/wp\/v2\/posts\/938","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.theusrus.de\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.theusrus.de\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.theusrus.de\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.theusrus.de\/blog\/wp-json\/wp\/v2\/comments?post=938"}],"version-history":[{"count":2,"href":"https:\/\/www.theusrus.de\/blog\/wp-json\/wp\/v2\/posts\/938\/revisions"}],"predecessor-version":[{"id":940,"href":"https:\/\/www.theusrus.de\/blog\/wp-json\/wp\/v2\/posts\/938\/revisions\/940"}],"wp:attachment":[{"href":"https:\/\/www.theusrus.de\/blog\/wp-json\/wp\/v2\/media?parent=938"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.theusrus.de\/blog\/wp-json\/wp\/v2\/categories?post=938"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.theusrus.de\/blog\/wp-json\/wp\/v2\/tags?post=938"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}