[External] Help with sub-setting

I think the syntax you are looking for is

datasubset <- data[ data$A ==1 & data$B ==  1 , ] )

This gives the subset of your original data for variable A with value
1 and variable B with value 1.


On Mon, May 25, 2020 at 12:57 PM Burgess, Jamie
<Jamie.Burgess at 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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