Using aggregate in R to retrieve list value

Question

The code aggregate(df$var, list(df$id), runs.test) returns the test statistic (standard normal) of the variance of a given function.

Normally, the code runs.test(data)$p.value gives you the p-value. But aggregate(df$var, list(df$id), runs.test(df$var)$p.value) gives the the error:

Error in match.fun(FUN) : 
  'runs.test(df$var)$p.value' is not a function, character or symbol

How can I use aggregate to give me the p-value?

a reproducible example would be nice. But you might try aggregate(df$var, list(df$id), function(x) runs.test(x)$p.value) — emilliman5
– emilliman5, Commented Oct 11, 2017 at 22:21

Rui Barradas · Accepted Answer · 2017-10-11 22:24:40Z

1

You will have to declare an anonymous function.

aggregate(var ~ id, data = df, FUN = function(x) runs.test(x)$p.value)

By the way, when you use functions that are not base R functions like runs.test, always include a call to library(pkgname) as the first line of code.

answered Oct 11, 2017 at 22:24

Rui Barradas

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