Summarize your data with descriptive stats
Importing and Managing Financial Data in Python
Stefan Jansen
Instructor
Central tendency
- Mean (average): $\displaystyle \bar{x} = \frac{1}{n}\sum_{i=1}^n x_i$
- Median: 50% of values smaller/larger
- Mode: most frequent value
Central tendency
- Mean (average): $\displaystyle \bar{x} = \frac{1}{n}\sum_{i=1}^n x_i$
- Median: 50% of values smaller/larger
- Mode: most frequent value
Central tendency
- Mean (average): $\displaystyle \bar{x} = \frac{1}{n}\sum_{i=1}^n x_i$
- Median: 50% of values smaller/larger
- Mode: most frequent value
Calculate summary statistics
Dispersion
- Variance: Sum all of the squared differences from mean and divide by $n-1$
- $\displaystyle var = \frac{1}{n-1}\sum_{i=1}^n(x_i-\bar{x})^2$
- Standard deviation: Square root of variance
- $\displaystyle sd = \sqrt{var}$
