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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
Try it Yourself »