Handling missing data in a rheumatoid arthritis registry using random forest approach

Ahmad Alsaber, Adeeba Al-Herz, Jiazhu Pan, Ahmad T. Al-Sultan, Divya Mishra, KRRD Group

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)
3 Downloads (Pure)


Missing data in clinical epidemiological research violate the intention-to-treat principle, reduce the power of statistical analysis, and can introduce bias if the cause of missing data is related to a patient's response to treatment. Multiple imputation provides a solution to predict the values of missing data. The main objective of this study is to estimate and impute missing values in patient records. The data from the Kuwait Registry for Rheumatic Diseases was used to deal with missing values among patient records. A number of methods were implemented to deal with missing data; however, choosing the best imputation method was judged by the lowest root mean square error (RMSE). Among 1735 rheumatoid arthritis patients, we found missing values vary from 5% to 65.5% of the total observations. The results show that sequential random forest method can estimate these missing values with a high level of accuracy. The RMSE varied between 2.5 and 5.0. missForest had the lowest imputation error for both continuous and categorical variables under each missing data rate (10%, 20%, and 30%) and had the smallest prediction error difference when the models used the imputed laboratory values.

Original languageEnglish
Pages (from-to) 1282–1293
Number of pages12
JournalInternational Journal of Rheumatic Diseases
Volume 24
Issue number10
Early online date12 Aug 2021
Publication statusPublished - 1 Oct 2021


  • rheumatoid
  • missing values
  • imputation techniques
  • random forest
  • kNN
  • KRRD


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