August 1999
Intermediate to advanced
701 pages
19h 7m
English
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Chapter 15. Statistics
There are three kinds of lies: lies, damned lies, and statistics.
—Benjamin Disraeli (1804-1881)
Statistics is the science of quantifying conjectures. How likely is an event? How much does it depend on other events? Was an event due to chance, or is it attributable to another cause? And for whatever answers you might have for these questions, how confident are you that they’re correct?
Statistics is not the same as probability, but the two are deeply intertwined and on occasion blend together. The proper distinction between them is this: probability is a mathematical discipline, and probability problems have unique, correct solutions. Statistics is concerned with the application of probability theory to particular real-world phenomena.
A more colloquial distinction is that probability deals with small amounts of data, and statistics deals with large amounts. As you saw in the last chapter, probability uses random numbers and random variables to represent individual events. Statistics is about situations: given poll results, or medical studies, or web hits, what can you infer? Probability began with the study of gambling; statistics has a more sober heritage. It arose primarily because of the need to estimate population, trade, and unemployment.
In this chapter, we’ll begin with some simple statistical measures: mean, median, mode, variance, and standard deviation. Then we’ll explore significance tests, which tell you how sure you can be that some phenomenon ...
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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.