Learn R for Applied Statistics by Eric Goh Ming Hui

Author:Eric Goh Ming Hui
Language: eng
Format: epub
ISBN: 9781484242001
Publisher: Apress

To find the sample standard deviation of a data set, you use the sd() function:> sd(data$x2);

[1] 1.918611

Normal Distribution

Normal distribution is one of the more important theories because nearly all statistical tests require the data to be distributed normally. It describes how data looks when plotted. Normal distribution is also called the bell curve, shown in Figure 4-8.

Figure 4-8Normal Distribution or Bell Curve

You can plot a distribution in R using the hist() function :> hist(data$x, breaks=15);

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