R Mean
Mean, Median, and Mode
In statistics, there are often three values that interests us:
Mean
To calculate the average value (mean) of a variable from the mtcars data set, find the sum of all values, and divide the sum by the number of values.
Sorted observation of wt (weight)
| 1.513 | 1.615 | 1.835 | 1.935 | 2.140 | 2.200 | 2.320 | 2.465 |
| 2.620 | 2.770 | 2.780 | 2.875 | 3.150 | 3.170 | 3.190 | 3.215 |
| 3.435 | 3.440 | 3.440 | 3.440 | 3.460 | 3.520 | 3.570 | 3.570 |
| 3.730 | 3.780 | 3.840 | 3.845 | 4.070 | 5.250 | 5.345 | 5.424 |
Luckily for us, the mean() function in R can do it for you:
Example
Find the average weight (wt) of a car:
Data_Cars <- mtcars
mean(Data_Cars$wt)
Result:
[1] 3.21725