September 2020
Beginner to intermediate
528 pages
12h 33m
English
Content preview from Analytics Stories
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.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.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.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.
CHAPTER 26Will My Favorite Sports Team Be Great Next Year?
In 2015, the NFL Arizona Cardinals had a great season. They won 13 of 16 games and lost in the NFC championship game. Fans probably had high hopes for the 2016 season. Unfortunately for Cardinals fans, in 2016, the Cardinals fell back to earth and had a mediocre 7-8-1 season. This decline from excellence is not unusual. The eight teams that won at least 12 of 16 games in 2016 or 2017 averaged only 9.5 wins the next year. On the other hand, the six teams that won 4 or fewer games in 2016 or 2017 averaged winning 5.9 games the next season. The moral is that a good team is likely to be better than average next year but not as good as last year, and a bad team is likely to be worse than average next year but not as bad as they were last year. This is a notable example of regression to the mean.
Francis Galton and Regression to the Mean
Francis Galton (1822–1911) was a brilliant Englishman who made important contributions to many fields, including statistics, meteorology, psychology, and geography. Galton is credited with creating the concept of correlation and regression. Galton also coined the phrase “nature versus nurture.” Galton collected the following data for 898 children (see the file
Galton.xlsx):
- Height of the mother and father
- Height of the child
Recall from Chapter 8, “Modeling Relationships Between Two Variables,” that the correlation between two data sets is always between –1 and +1. Galton observed that ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.