Mean
- Median is a measure of the center.
-
- But there is another measure - Mean or average value
- $\text{mean} = \cfrac{1}{n} \sum x_i$
- Where $n$ - number of data values, and $x_i$ - each data value.
Robustness
- Mean is not robust (susceptibile to outliers), but median is.
- 10% trimmed mean - mean calculated from 10% to 90% of our data, more robust to extreme values
10% trimmed mean in R
mean(..., trim=0.1)