R Median
Median
The median value is the value in the middle, after you have sorted all the values.
If we take a look at the values of the wt variable (from the mtcars data set), we will see that there are two numbers in the middle:
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 |
Note: If there are two numbers in the middle, you must divide the sum of those numbers by two, to find the median.
Luckily, R has a function that does all of that for you: Just use the median()
function to find the middle value:
Example
Find the mid point value of weight (wt):
Data_Cars <- mtcars
median(Data_Cars$wt)
Result:
[1] 3.325
