October 2019
Beginner to intermediate
674 pages
16h 43m
English
Content preview from Mastering pandas - Second Edition
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The mean
The mean or sample is the most popular measure of central tendency. It is equal to the sum of all the values in the dataset, divided by the number of values in the dataset. Thus, in a dataset of n values, the mean is calculated as follows:
We use 
if the data values are from a sample and µ if the data values are from a population.
The sample mean and population mean are different. The sample mean is what is known as an unbiased estimator of the true population mean. By repeatedly randomly sampling the population to calculate the sample ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.