[R] extracting numeric values returned when using the by function to run the acf function

[Eric Berger]

as.numeric(by(RecallSmall[1:4,"value"],RecallSmall[1:4,"ID"],acf,na.action=na.pass,plot=FALSE)[[1]]$acf)


On Tue, May 10, 2022 at 8:29 PM Sorkin, John <jsorkin using som.umaryland.edu>
wrote:

> I am using the by function to run the acf function. Each run of the by
> function returns more information than I want. All I want is the four
> values that acf returns, which using the data below would be
> 1.00  0.15   -0.50  -0.15
> How  can I isolate these four values from the output returned by the by
> function.
>
> Sample code:
>
> RecallSmall <- data.frame(ID=c(1,1,1,1),value=c(6,5,3,4))
> cat("Here are the data\n")
> RecallSmall
> cat("All I want is autocorrerlations, e.g. 1.00  0.15 -0.50 -0.15 \n ")
> # attempting to subset does not work at all
>
> by(RecallSmall[1:4,"value"],RecallSmall[1:4,"ID"],acf,na.action=na.pass,plot=FALSE)$acf
> # this gives me more than I want, not just the numeric results.
>
> by(RecallSmall[1:4,"value"],RecallSmall[1:4,"ID"],acf,na.action=na.pass,plot=FALSE)
>
> # For your reference, this is what the acf function returns
> acf(RecallSmall[1:4,"value"],na.action=na.pass,plot=FALSE)
> # For your reference, this is what the acf function returns when the
> output is subset
> acf(RecallSmall[1:4,"value"],na.action=na.pass,plot=FALSE)Thank you, John
>
> Thank you,
> John
>
>
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