Predictive Hacks

R: How To Assign Values Based On Multiple Conditions Of Different Columns

dplyr

In the previous post, we showed how we can assign values in Pandas Data Frames based on multiple conditions of different columns.

Again we will work with the famous titanic dataset and our scenario is the following:

  • If the Age is NAand Pclass=1 then the Age=40
  • If the Age is NAand Pclass=2 then the Age=30
  • If the Age is NAand Pclass=3 then the Age=25
  • Else the Age will remain as is

Load the Data

library(dplyr)

url = 'https://gist.githubusercontent.com/michhar/2dfd2de0d4f8727f873422c5d959fff5/raw/ff414a1bcfcba32481e4d4e8db578e55872a2ca1/titanic.csv'

df = read.csv(url, sep="\t")

Use of case_when function of dplyr

For this task, we will use the case_when function of dplyr as follows:

df<-df%>%mutate(New_Column = case_when(
  is.na(Age) & Pclass==1 ~ 40,
  is.na(Age) & Pclass==2 ~ 30,
  is.na(Age) & Pclass==3 ~ 25,
  TRUE~Age
  ))

Let’s have a look at the Age, Pclass and the New_Column that we created.

df%>%select(Age, Pclass, New_Column)
      Age Pclass New_Column
1   22.00      3      22.00
2   38.00      1      38.00
3   26.00      3      26.00
4   35.00      1      35.00
5   35.00      3      35.00
6      NA      3      25.00

As we can see we get the expected results 🙂

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