Description Usage Arguments Value Examples
Merge data sets. Check that each data set being merged has a unique key
1 | merge.unique(x, y, by, ..., check.unique = TRUE)
|
x, |
y data frames, or objects to be coerced to one |
by |
character indicating which column to merge by (and check uniqueness) |
check.unique |
logical; if TRUE, x and y are checked to see that the column used for merging is unique |
Merged data set
1 2 3 4 | df.non <- data.frame(ppn = c(1L,1L,2L), var1 = seq_len(3))
df.unique <- data.frame(ppn = seq_len(3), var2 = seq_len(3))
merge.unique(df.unique, df.non, by = 'ppn')
# Error: check.unique(y, id = by) is not TRUE
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