Hot-Deck

The technique then finds the first missing value and uses the cell value immediately prior to the data that are missing to impute the missing value.

Cold-Deck

Selects donors from another dataset to compute missing data.
表示从以前的调查数据中获取信息，如历史数据（比如病人以前的病例记录），同样该方法不能消除历史偏差。

Mean-substitution

Another imputation technique involves replacing any missing value with the mean of that varable for alll other cases, which has the benefit of not changing the sample mean for that variable.

Regression

A regression model is esimated to predict observed values of a variable based on other variables, and that model is then used to impute values in cases where that variable is missing.

Some Libraries

References

https://wenku.baidu.com/view/00a209c07cd184254a353586?fr=prin