CODEWITHSUNDEEP
rrandom
Kώστας Κούδας
Kώστας Κούδας

Reputation: 299

How can I make many samples from a specific population in R?

I have this population:

MyPopulation <- c(1:100)

and I want to create a data frame of 40 columns and 5 lines. Each column has to be a random sample of MyPopulation, so I try this:

MySample <- data.frame(NoSample = c(1:5))

for (i in 1:40) {
  MySample$i <- sample(MyPopulation,5)
}

The result is a data frame with only 1 more column (named i) with a random sample as values.

What am I doing wrong?

Upvotes: 0

Views: 68

Answers (4)

SteveM
SteveM

Reputation: 2301

You can also create a single stream of random values and then state the column dimension in a matrix with the row count being imputed:

m <- matrix(sample(1:1000, 200, replace = TRUE), ncol = 40)
df <- as.data.frame(m)

Upvotes: 1

ThomasIsCoding
ThomasIsCoding

Reputation: 102609

Maybe you can try replicate + as.data.frame

MySample <- as.data.frame(replicate(40,sample(MyPopulation,5)))

Upvotes: 1

L Smeets
L Smeets

Reputation: 942

The easiest solution probably would be

MyPopulation <- c(1:100)

MySample <- data.frame(NoSample = c(1:5))

for (i in 1:40) {
  MySample[,i+1] <- sample(MyPopulation,5)
}

Upvotes: 1

user2974951
user2974951

Reputation: 10385

You cannot assign new columns that way, try MySample[paste(i)] = ...

That is you cannot assign a numeric value to a column, hence strings.

Upvotes: 1

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