- [ ] [6.4.1. Univariate vs. Multivariate Imputation](https://scikit-learn.org/stable/modules/impute.html#univariate-vs-multivariate-imputation) - [ ] [6.4.2. Univariate feature imputation](https://scikit-learn.org/stable/modules/impute.html#univariate-feature-imputation) - [ ] [6.4.3. Multivariate feature imputation](https://scikit-learn.org/stable/modules/impute.html#multivariate-feature-imputation) - [ ] [6.4.4. Nearest neighbors imputation](https://scikit-learn.org/stable/modules/impute.html#nearest-neighbors-imputation) - [ ] [6.4.5. Keeping the number of features constants](https://scikit-learn.org/stable/modules/impute.html#keeping-the-number-of-features-constants) - [ ] [6.4.6. Marking imputed values](https://scikit-learn.org/stable/modules/impute.html#marking-imputed-values) - [ ] [6.4.7. Estimators that handle NaN values](https://scikit-learn.org/stable/modules/impute.html#estimators-that-handle-nan-values)