How to merge or join 2 dataframes in r

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How to merge or join 2 dataframes in r?
Jul 15, 2019 in Data Analytics by Karthick
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1 answer to this question.

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Hi,


When you merge two Dataframes, the result is a new Dataframe that contains data from both Dataframes. The key argument in the merge() is by. The by argument specifies how rows should be matched during the merge. You can see the below example.

risk.survey <- data.frame(
  "participant" = c(1, 2, 3, 4, 5),
  "risk.score" = c(3, 4, 5, 3, 1))

happiness.survey <- data.frame(
  "participant" = c(4, 2, 5, 1, 3),
  "happiness.score" = c(20, 40, 50, 90, 53))

# Combine the risk and happiness surveys by matching participant.id
combined.survey <- merge(x = risk.survey,
                         y = happiness.survey,
                         by = "participant",
                         all = TRUE)
answered Oct 30, 2020 by MD
• 95,180 points

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