# Statistical Analysis

ref: ExcelIsFun

`Mode`

: the one that occurs most frequently. `Mode`

is also the only way to calculate an "average" for categorical data

`Median`

: postionnally, the one in the middle

`Skew`

/ skewness: measure the shape of the data distribution. Skew tells to which way the distribution is tilting.

Skew = tilt of histogram

- left or negative skew:
- the frequency of small numbers is low, and the freq for large numbers is high
- usually, mean < median

- no skew = bell shape or symmetrical shape
- mean = median

- right or positive skew:
- the frequency of small numbers is high, and the freq for large numbers is low
- usually, mean > median

`Moving Average`

: like average of last 7 days. Use to smooth out numbers to give you a better overview of the trend.