Plotting Box Plots

Quick reference

• 00:05 All right, moving right along, in this video, I want to look at box plots.
• 00:08 And box plots are a lot of fun.
• 00:10 And before we get into it, let's come up here real quick and
• 00:13 just check our data one more time.
• 00:15 So we've got a data frame of 50 and 4.
• 00:19 And if we run this again just to make sure,
• 00:22 we've got 4 columns and 50 rows, okay?
• 00:26 So creating box plots is just as easy as all the other plots.
• 00:29 So we can just go my_df.plot, and we can pass in kind = box.
• 00:35 And when we run this, boom, we get our cool little box plots.
• 00:42 And we could pass in most of the attributes that we've done in the past.
• 00:45 So if we wanted to change the size of this, we could go fig size.
• 00:49 And we could set this equal to what 10 and 5, let's say.
• 00:54 And now it's a little bit bigger, these things seem to be a little wider.
• 00:58 We could change the color of this like we can with everything else, so cmap equals.
• 01:02 And let's head back over to our thing here and let's just kind of look around,
• 01:07 let's grab something fun, nippy spectral.
• 01:10 I have to know what that means or what that is.
• 01:13 So let's copy and paste this one Shift+ Enter to run this.
• 01:16 And okay, it's just sort of black and grey.
• 01:18 That's no fun.
• 01:19 Let's see what else.
• 01:21 Jet, rainbow let's try rainbow, make statistics fun.
• 01:28 Okay, so you know whatever, you could change the color, and that's cool.
• 01:32 Now not everything works.
• 01:34 We can't for instance create a legend if we go legend = true,
• 01:37 that doesn't really work here.
• 01:39 We could give this a title, let's say boxplot, whatever.
• 01:44 So now we have a title here.
• 01:47 Now like so many other things, we can do this another way, like we have before.
• 01:52 So we could just call my_df.plot.box, just call the box function.
• 01:59 And again, we can pass in all the same things.
• 02:02 So we can go, fig size = 10 and 5 for instance, it makes it bigger.
• 02:10 And, this is actually kind of cool.
• 02:12 So instead of doing it the first way, if you want to learn more about this
• 02:17 creature, my_df.plot.box and then just come inside your function here and
• 02:21 then Shift+Tab and we can learn more about this if we expand this.
• 02:26 Not only does it teach us the things that we can do inside of our function here,
• 02:31 but it also gives us this cool little description.
• 02:34 So if you're not sure what a box plot is, for instance,
• 02:36 you could just read through here.
• 02:38 A box plot is a method for
• 02:39 graphically depicting groups of numerical data through their quartiles.
• 02:42 So usually, quarter one through four, or in this case, one through three.
• 02:46 The box extends from Q1 to Q3 quartile,
• 02:49 values of the data with a line at the median.
• 02:52 So we see a line right here at the median, right?
• 02:56 So that's always good to look at.
• 02:58 The whiskers extend from the edges of the box to show the range of the data.
• 03:03 So these are the whiskers, these guys,
• 03:05 these straight lines at the top and bottom.
• 03:08 kind of look like whiskers, I guess, right?
• 03:09 And so you could just read through here if you're interested in this stuff.
• 03:12 It even gives you a Wikipedia link to more information if you want to learn more
• 03:17 about them.
• 03:17 So that's kind of cool.
• 03:18 So one thing I will kind of mention here if we add a grid = true, that actually is
• 03:23 kind of useful because you might want to know exactly where the median is and
• 03:27 this grid line will show you exactly where zero is.
• 03:30 So without that grid, you might not know exactly where this green line is,
• 03:35 is it at zero, is it above?
• 03:36 You can eyeball it and seems to be above it, but have the grid lines specifically,
• 03:41 that's even better.
• 03:42 So those are box plots, very cool.
• 03:44 In the next video, we'll look at hex plots.

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