[R] Help with sub-setting

[Jim Lemon]

Hi Jamie,
Your seem to want some descriptive statistic applied to subsets of
your data frame "data" (maybe a more imaginative name would help).
I'll guess that your data frame contains variables X, Y and Z among
others. Further, I'll guess that you want the summaries of variable Z
subset by Y and X.

data<-data.frame(X=sample(1:2,100,TRUE),Y=sample(1:2,100,TRUE),
 Z=rnorm(100))
by(data,data[,c("X","Y")],summary)

Jim

On Tue, May 26, 2020 at 2:57 AM Burgess, Jamie
<Jamie.Burgess using liverpool.ac.uk> wrote:
>
> Dear all,
>
> I hope this message finds you well. I am currently trying to subset my data by two variables, so far, I have tried two different ways to stratify participants into groups. I would like to use the ‘summary’ and ‘table’ arguments to characterise the data of participants based on the presence of two variables and summarise this sub-set against a third variable.
> I have used this method:
>
> dgb001<-subset(data,data$variable==1 & data,data$variable)
>
>
> However, I get the following error: “Error: cannot allocate vector of size 16.0 Gb”. Is there another method I can try?
>
>
> Kind regards,
>
>
> Jamie Burgess
>
> PhD Student Endocrinology and Diabetes
>
> University of Liverpool
>
> Aintree University Hospital &
>
> The Walton Centre
>
> Institute of Ageing & Chronic Disease
>
> 0151 529 5936
>
>
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>
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