How to average score from different elements

2018-06-08 04:49:53

This question already has an answer here:

Mean per group in a data.frame [duplicate] 8 answers

Aggregate / summarize multiple variables per group (eg sum, mean) 4 answers

How to make a great R reproducible example? 23 answers

我们可以尝试

library(data.table)
setDT(data)[, list(avg = mean(Score)), by = AD]

library(data.table)
dt <-  data.table(ur_data)
dt[, lapply(.SD, mean), by = "AD"]

I'd recommend the dplyr package.

require(dplyr)
data %>% 
 group_by(AD) %>% 
 summarize(avg = mean(Score))

Is that what you're looking for?

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