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Feb 7th, 2016
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  1.  
  2. age <- train.data$Age
  3. summary(age)
  4.  
  5. median(age)
  6. median(age, na.rm=T)
  7. age_median <- median(age, na.rm=T)
  8.  
  9. is.na(age)
  10. age[is.na(age)] <- age_median
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