Call external arguments within a function in R

Question

I want to run an ANOVA test on several data (Day, Week and Month). My idea was to create a loop that call each dataset (Day, Week and Month). However the following code does not work, because does not recognise the value[i].

df1<-data.frame(Day=c(1,2,5,6,9,8),Week=c(22,45,33,3,2,11),Month=c(45,6,7,12,4,7),
           type=c("A","C","B","A","C","B"))

value<-c("Day","Week","Month")

    for(i in 1:length(value)){
    av<-aov(value[i] ~ type, data = data)
    return(av)
    }

Do you have any suggestion on how I could improve the code?

Try get(value[i]). Or, maybe better, df1[[ value[i] ]].

Rui Barradas
– Rui Barradas

2017-08-26 15:10:42 +00:00
Commented Aug 26, 2017 at 15:10 — Rui Barradas
– Rui Barradas, Commented Aug 26, 2017 at 15:10
This is what I needed. Thanks.

CafféSospeso
– CafféSospeso

2017-08-26 17:48:59 +00:00
Commented Aug 26, 2017 at 17:48 — CafféSospeso
– CafféSospeso, Commented Aug 26, 2017 at 17:48

Roland · Accepted Answer · 2017-08-26 15:15:11Z

2

You don't need a loop:

m <- aov(cbind(Day, Week, Month) ~ type, data = df1)
summary(m)

answered Aug 26, 2017 at 15:15

Roland

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