Message-ID: <e552afed-5ff5-f541-9ca4-1799829a7f80@umu.se>
Date: 2019-02-11T23:28:56Z
From: Göran Broström
Subject: Select
In-Reply-To: <CAJOiR6bB7FGFV3yuQoL_dwGAZ+SVsBDvP_jY=Ug-AAEDMBRsgw@mail.gmail.com>
On 2019-02-11 23:35, Val wrote:
> Hi all,
>
> I have a data frame with tow variables group and its size.
> mydat<- read.table( text='group count
> G1 25
> G2 15
> G3 12
> G4 31
> G5 10' , header = TRUE, as.is = TRUE )
>
How about
x <- sample(1:5)
total <- mydat$count[x[1]]
i <- 1
while (total < 40){
i <- i + 1
total <- total + mydat$count[x[i]]
}
print(mydat$group[x[1:i]])
G?ran
> I want to select group ID randomly (without replacement) until the
> sum of count reaches 40.
> So, in the first case, the data frame could be
> G4 31
> 65 10
>
> In other case, it could be
> G5 10
> G2 15
> G3 12
>
> How do I put sum of count variable is a minimum of 40 restriction?
>
> Than k you in advance
>
>
>
>
>
>
> I want to select group ids randomly until I reach the
>
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