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Four important functions used in dplyr to merge two datasets.

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FunctionObjectivesArgumentsMultiple keys
left_join()Merge two datasets. Keep all observations from the origin tabledata, origin, destination, by = "ID"origin, destination, by = c("ID", "ID2")
right_join()Merge two datasets. Keep all observations from the destination tabledata, origin, destination, by = "ID"origin, destination, by = c("ID", "ID2")
inner_join()Merge two datasets. Excludes all unmatched rowsdata, origin, destination, by = "ID"origin, destination, by = c("ID", "ID2")
full_join()Merge two datasets. Keeps all observationsdata, origin, destination, by = "ID"origin, destination, by = c("ID", "ID2")

Using the tidyr Library you can transform a dataset with the gather(), spread(), separate() and unit() functions.

Function

Objectives

Arguments

gather()

Transform the data from wide to long

(data, key, value, na.rm = FALSE)

spread()

Transform the data from long to wide

(data, key, value)

separate()

Split one variables into two

(data, col, into, sep= "", remove = TRUE)

unit()

Unit two variables into one

(data, col, conc ,sep= "", remove = TRUE)

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