Correcting a small glitch - see new code.
________________________________
From: Leo Mada <[email protected]>
Sent: Sunday, June 2, 2024 8:34 PM
To: Shadee Ashtari <[email protected]>
Cc: [email protected] <[email protected]>
Subject: [R] R code for overlapping variables -- count
Dear Shadee,
If you have a data.frame with the following columns:
n = 100; # population size
x = data.frame(
Sex = sample(c("M","F"), n, T),
Country = sample(c("AA", "BB", "US"), n, T),
Income = as.factor(sample(1:3, n, T))
)
# Dummy variable
ONE = rep(1, nrow(x))
# corrected
r = aggregate(ONE ~ Sex + Income + Country, length, data = x)
r = r[, c("Country", "Income", "Sex", "ONE")]
names(r)[4] = "Count"
print(r)
It is possible to write more simple code, if you need only the particular
combination of variables (which you specified in your mail). But this is the
more general approach.
Note: you may want to use "sum" instead of "length", e.g. if you have a column
specifying the number of individuals in that category.
Hope this helps,
Leonard
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