Return a standardized list of values. @params: data, a list of values to standardize @returns: a list of standardized values (rounded to ndigits decimal places) @examples: >>> standardization([2, 7, 10, 20, 30, 50]) [-0.999, -0.719, -0.551, 0.009, 0.57, 1.69] >>> standa
(data: list, ndigits: int = 3)
| 49 | |
| 50 | |
| 51 | def standardization(data: list, ndigits: int = 3) -> list: |
| 52 | """ |
| 53 | Return a standardized list of values. |
| 54 | |
| 55 | @params: data, a list of values to standardize |
| 56 | @returns: a list of standardized values (rounded to ndigits decimal places) |
| 57 | @examples: |
| 58 | >>> standardization([2, 7, 10, 20, 30, 50]) |
| 59 | [-0.999, -0.719, -0.551, 0.009, 0.57, 1.69] |
| 60 | >>> standardization([5, 10, 15, 20, 25]) |
| 61 | [-1.265, -0.632, 0.0, 0.632, 1.265] |
| 62 | """ |
| 63 | # variables for calculation |
| 64 | mu = mean(data) |
| 65 | sigma = stdev(data) |
| 66 | # standardize data |
| 67 | return [round((x - mu) / (sigma), ndigits) for x in data] |