R Mean of multiple groups by quartiles

Question

I have a dataframe with different variables, e.g.: x1, x2 and so on. I created quartiles based on one variable (BE) with the following code:

Quantile_Var <- Var%>% mutate(Quartile = ntile(BE, 5))

Now I want to see the means of each variables (x1, x2...) by quartiles. I tried to use the following code, but it gives me too many information since I only need the means. How to edit the code so R only gives me the means?

Quantile_Testvar %>% split(.$quartile) %>% map(summary)`

It's probably completly easy, unfortunaly I have struggles to do so

score 1 · Accepted Answer · answered Aug 15 '21 at 11:41

You can use output from ntile as a group and get the average value for all the x variables.

library(dplyr)

Quantile_Var <- Var %>% 
                  group_by(Quartile = ntile(BE, 5)) %>%
                  summarise(across(starts_with('x'), mean, na.rm = TRUE))

R Mean of multiple groups by quartiles

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