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Jun 22nd, 2018
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  1. mean(cohort5$age.at.diagnosis, na.rm = TRUE)
  2.  
  3. cohort5$age.at.diagnosis <- as.numeric(cohort5$age.at.diagnosis) # if currently character
  4. cohort5$age.at.diagnosis <- as.numeric(as.character(cohort5$age.at.diagnosis)) # if currently factor
  5.  
  6. na.omit(Cohort5)
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