{"id":3894,"date":"2018-10-10T15:57:05","date_gmt":"2018-10-10T22:57:05","guid":{"rendered":""},"modified":"-0001-11-30T00:00:00","modified_gmt":"-0001-11-30T07:00:00","slug":"3894","status":"publish","type":"post","link":"https:\/\/www.vernier.com\/til\/3894","title":{"rendered":"Why is my graphed data noisy, when the display in the meter is steady?"},"content":{"rendered":"<p>The difference is in the way the data are displayed in Logger <i>Pro<\/i>. When you look at the digital meter window, you are seeing a number that is the average of many readings taken between the times the display is changed. Noise is averaged out.<\/p>\n<p>When you choose collect to start a graph, a point is plotted each time a reading is made (unless you have &#8220;Oversampling&#8221; on, see below). In short, you are probably seeing the raw readings while graphing and &#8220;smoothed&#8221; readings when looking at the digital (or analog) meter window.<\/p>\n<p>You can also smooth graphed data, after it is collected, by going to Experiment\/Data Collection and checking the Oversampling box. This will cause Logger <i>Pro<\/i> to average readings between times when it plots a point on the graph. Now, if you are collecting data very quickly, this will not make much difference (there is not time to take and average a lot of readings), but if you take data more slowly, the points plotted will be averaged considerably.<\/p>\n<p>It is also possible to smooth data after it is collected by creating a New Calculated Column based on the original data and using SmoothAve (Smooth Average)or SmoothSG (Savitsky-Goley smoothing) as the function in the Expression for the New Calculated Column.<\/p>","protected":false},"excerpt":{"rendered":"<p>The difference is in the way the data are displayed in Logger Pro. When you look at the digital meter window, you are seeing a&#8230;<\/p>\n","protected":false},"author":8976,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[],"tags":[6556,882,5048,3821],"class_list":["post-3894","post","type-post","status-publish","format-standard","hentry","tag-averaging","tag-noise","tag-oversampling","tag-smoothing"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/posts\/3894","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/users\/8976"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/comments?post=3894"}],"version-history":[{"count":0,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/posts\/3894\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/media?parent=3894"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/categories?post=3894"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/tags?post=3894"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}