Five number summary - summary (data) or fivenum(data)
> summary(x)
- min(data)
- quantile(data, 0.25)
- median(data)
- quantile(data, 0.75)
- max(data)
Other important One-variable statistics
> mean(x)
[1] 6.4
> var(x) #variance
[1] 9.3
> sd(x) #standard deviation
[1] 3.04959
Important Two-variable statistics
> x <- c(2,5,7,8,10)
> y <- c(8,15,16,18,25)
> cor(x,y) #correlation coefficient
[1] 0.9691284
> cov(x,y) #covariance
[1] 18.05
Sampling from a list
> sample(c(8,15,16,18,25), size=3, replace=F) #Sample size 3 without replacement
Sampling from a normal distribution
> rnorm(n,mean,SD)