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The mice flow: mice - with - pool

Multiple imputation by chained equations, or MICE, allows us to estimate the uncertainty from imputation by imputing a data set multiple times with model-based imputation, while drawing from conditional distributions. This way, each imputed data set is slightly different. Then, an analysis is conducted on each of them and the results are pooled together, yielding the quantities of interest, alongside their confidence intervals that reflect the imputation uncertainty.

In this exercise, you will practice the typical MICE flow: mice() - with() - pool(). You will perform a regression analysis on the biopics data to see which subject occupation, sub_type, is associated with highest movie earnings. Let's play with mice!

Cet exercice fait partie du cours

Handling Missing Data with Imputations in R

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Instructions

  • Load the mice package and impute biopics with mice() using 5 imputations, assigning the result to biopics_multiimp.
  • Fit a linear regression model that explains earnings using year and sub_type to each imputed data set, assigning the result to lm_multiimp.
  • Pool the regression models saved in lm_multiimp together, assigning the result to lm_pooled.
  • Summarize lm_pooled such that it produces confidence intervals with a 95% confidence level.

Exercice interactif pratique

Essayez cet exercice en complétant cet exemple de code.

# Load mice package
___

# Impute biopics with mice using 5 imputations
biopics_multiimp <- ___(___, m = ___, seed = 3108)

# Fit linear regression to each imputed data set 
lm_multiimp <- ___(___, ___)

# Pool and summarize regression results
lm_pooled <- ___(___)
___(___, conf.int = ___, conf.level = ___)
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