3/10/2024 0 Comments Box plot whiskers meaningTED 3R had the lowest yield overall, and 9I had the highest yields. What else can we learn about the yield from these box plots? The varying box sizes tells us the spread of the data is different for each TED. If you want to learn more about skew, check out this image from Code Burst. Most of the distributions are not particularly skweed, but 4R and 9I are a little bit negative skewed, and 1R is a liftle positive skewed. These boxplots have something else inside the box– a dotted line for the mean! Seeing whether the mean is above or below the median helps us understand if the data is skewed or not. These boxplots have something else inside the box– a dotted line for the mean! This is an example of yield data from an extension article titled Sifting and Winnowing by Spyros Mourtzinis, Shawn Conley, and many others. Not all data sets have outliers, so don’t be surprised if you don’t see them. These outlier values are shown as dots or asterisks. A high outlier is defined as anything bigger than the third quartile plus 1.5 times the interquartile range. What’s an outlier? A low outlier is defined as anything smaller than the first quartile minus 1.5 times the interquartile range. Moving away from the box, the lines (or whiskers) show the minimum and maximum non-outlier values. Half of the data in the plot falls within the box, and the size of the box is the interquartile range. One quarter of the data falls below this value. The left side of the box (or bottom of the box if the plot is vertical) is the first quartile. Half of the data is below this value, and half of the data is above this value. The center line is the median, or middle value. When I read boxplot, I move from the center out. I like this figure because it’s clearly labeled, and its values are based on the standard normal distribution (centered on 0, standard deviation of 1). To orient you with the parts of a boxplot, here is a great graphic from Towards Data Science. They can be oriented horizontally or vertically, and you’ll see examples of both throughout this post. Today I’m going to show a couple examples, and in the future I’ll show you how to make your own!įirstly, box and whisker plots are also called boxplots. Box and whisker plots are one of my favorite ways to visualize data, but they can be challenging to read if you haven’t seen them before.
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