Commit 7377f41d authored by Bert Balcaen's avatar Bert Balcaen

Starting making notes on 'intro to datascience' course.

parent a8f8269b
# Missing data
- partial deletion
- imputation
## Partial deletion
- **listwise deletion**: *entire record* is excluded from analysis if any single value is missing
- **pairwise deletion**: *only specific missing values* excluded
## Imputation
- = making an educated guess at missing data
- = approximating missing values
- different techniques; hard to get right
## Imputation using linear regression
= create an equation for finding missing values using available data
- overemphasizes existing trends
- will produce exact values for the missing entries, which would suggest a greater certainty in the missing values than we actually have
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