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Asked: 2026-05-20T21:29:25+00:00

I have a dataset with 20 variables v1 – v20. Now I’d like to

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I have a dataset with 20 variables v1 – v20. Now I’d like to use cor(…) to calculate the correlation between v2 and v10 until v15 and v3 and v10 until v15. What’s the best way to do this? Do I have to do this for each variable pair using

cor(v2, v10)
cor(v2, v11)
cor(v2, v12)
and so on?

Here is the actual dataset:

   > dput(dataset)
structure(list(Number = 1:15, Question.1.1 = c(3L, 4L, 5L, 5L, 
4L, 5L, 5L, 4L, 4L, 5L, 5L, 5L, 5L, 5L, 5L), Question.1.2 = c(1L, 
2L, 1L, 1L, 4L, 1L, 1L, 2L, 3L, 1L, 1L, 1L, 1L, 1L, 1L), Question.2.1 = c(5L, 
3L, 5L, 5L, 5L, 5L, 5L, 5L, 5L, 5L, 5L, 5L, 5L, 5L, 5L), Question.2.2 = c(2L, 
1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L), Question.3.1 = c(2L, 
NA, 4L, 5L, 4L, 3L, 5L, 3L, 5L, 5L, 5L, 5L, 4L, 4L, 4L), Question.3.2 = c(2L, 
NA, 1L, 1L, 2L, 2L, 1L, 4L, 3L, 1L, 1L, 1L, 2L, 2L, 1L), Question.4.1 = c(3L, 
2L, 5L, 2L, 5L, 5L, 5L, 3L, 5L, 5L, 5L, 5L, 4L, 5L, 2L), Question.4.2 = c(2L, 
2L, 1L, 2L, 2L, 1L, 2L, 3L, 3L, 1L, 1L, 1L, 1L, 1L, 4L), Question.5.1 = c(5L, 
3L, 5L, 3L, 4L, 4L, 5L, 3L, 5L, 5L, 5L, 5L, 5L, 4L, 4L), Question.5.2 = c(2L, 
2L, 1L, 1L, 3L, 2L, 1L, 3L, 4L, 1L, 1L, 1L, 1L, 1L, 1L), Question.6.1 = c(5L, 
2L, 2L, 2L, 3L, 2L, 3L, 1L, 3L, 3L, 5L, 4L, 3L, 3L, 1L), Question.6.2 = c(2L, 
3L, 2L, 1L, 2L, 3L, 3L, 3L, 3L, 2L, 1L, 1L, 2L, 2L, 1L), Question.7.1 = c(5L, 
2L, 5L, 5L, 5L, 3L, 5L, 5L, 2L, 4L, 5L, 5L, 5L, 4L, 5L), Question.7.2 = c(1L, 
4L, 1L, 1L, 2L, 2L, 1L, 1L, 3L, 1L, 1L, 1L, 1L, 1L, 1L), Question.8.1 = c(4L, 
5L, 5L, 5L, 5L, 5L, 5L, 5L, 5L, 5L, 5L, 5L, 5L, 5L, 5L), Question.8.2 = c(1L, 
1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L), Question.9.1 = c(5L, 
3L, 5L, 4L, 4L, 5L, 5L, 5L, 4L, 5L, 5L, 5L, 5L, 4L, 3L), Question.9.2 = c(1L, 
1L, 1L, 2L, 2L, 1L, 2L, 1L, 4L, 2L, 1L, 2L, 2L, 1L, 2L), AQ.1 = c(5L, 
5L, 5L, 1L, 3L, 5L, 5L, 5L, 5L, 2L, 2L, 2L, 5L, 5L, 3L), AQ.2 = c(2L, 
5L, 2L, 1L, 2L, 5L, 2L, 1L, 5L, 1L, 1L, 4L, 2L, 3L, 3L), Task.1 = c(5L, 
2L, 5L, 1L, 4L, 5L, 5L, 4L, 4L, 5L, 5L, 4L, 5L, 5L, 5L), Task.2 = c(4L, 
3L, 5L, 4L, 5L, 5L, 5L, 5L, 5L, 5L, 5L, 5L, 5L, 5L, 5L), Task.3 = c(4L, 
3L, 4L, 1L, 3L, 5L, 4L, 5L, 5L, 5L, 5L, 5L, 4L, 4L, 4L), Task.4 = c(5L, 
5L, 5L, 5L, 5L, 5L, 5L, 5L, 5L, 5L, 5L, 5L, 5L, 5L, 5L), Task.5 = c(5L, 
4L, 5L, 4L, 4L, 5L, 4L, 5L, 4L, 5L, 5L, 5L, 5L, 5L, 4L), GQ.1 = c(4L, 
2L, 2L, 5L, 4L, 4L, 5L, 4L, 5L, 5L, 5L, 4L, 4L, 5L, 4L), GQ.2 = c(4L, 
4L, 4L, 5L, 5L, 4L, 4L, 3L, 3L, 3L, 5L, 5L, 5L, 4L, 3L), GQ.3 = c(5L, 
3L, 2L, 5L, 3L, 5L, 5L, 5L, 4L, 5L, 5L, 5L, 4L, 4L, 4L), GQ.4 = c(5L, 
2L, 1L, 4L, 4L, 4L, 4L, 3L, 3L, 3L, 5L, 5L, 4L, 4L, 1L), GQ.5 = c(4L, 
3L, 4L, 5L, 5L, 4L, 4L, 4L, 4L, 5L, 5L, 5L, 5L, 4L, 3L), GQ.6 = c(2L, 
2L, 1L, 1L, 2L, 1L, 4L, 1L, 4L, 5L, 5L, 1L, 5L, 1L, 5L), GQ.7 = c(4L, 
5L, 5L, 5L, 4L, 2L, 3L, 5L, 3L, 5L, 5L, 2L, 5L, 3L, 2L), GQ.8 = c(2L, 
4L, 3L, 2L, 3L, 3L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 1L, 2L), GQ.9 = c(3L, 
5L, 2L, 3L, 4L, 4L, 5L, 3L, 4L, 4L, 3L, 3L, 4L, 2L, 2L), GQ.10 = c(3L, 
4L, 1L, 2L, 3L, 4L, 5L, 5L, 5L, 5L, 4L, 4L, 5L, 5L, 2L), Feature.1 = c(4L, 
4L, 2L, 3L, 4L, 4L, 5L, 5L, 4L, 5L, 5L, 4L, 5L, 3L, 4L), Feature.2 = c(4L, 
4L, 2L, 1L, 5L, 4L, 5L, 5L, 5L, 4L, 4L, 3L, 5L, 3L, 2L), Feature.3 = c(3L, 
2L, 1L, 2L, 5L, 5L, 2L, 4L, 2L, 4L, 4L, 5L, 2L, 4L, 2L), Feature.4 = c(3L, 
3L, 3L, 4L, 3L, 4L, 5L, 5L, 4L, 4L, 4L, 3L, 4L, 3L, 3L), Feature.5 = c(2L, 
2L, 3L, 3L, 4L, 3L, 4L, 4L, 2L, 4L, 3L, 4L, 5L, 3L, 1L), Feature.6 = c(5L, 
5L, 1L, 1L, 5L, 5L, 5L, 4L, 4L, 5L, 5L, 5L, 5L, 4L, 4L), Feature.7 = c(5L, 
3L, 2L, 5L, 4L, 5L, 3L, 5L, 4L, 5L, 5L, 5L, 5L, 4L, 4L)), .Names = c("Number", 
"Question.1.1", "Question.1.2", "Question.2.1", "Question.2.2", 
"Question.3.1", "Question.3.2", "Question.4.1", "Question.4.2", 
"Question.5.1", "Question.5.2", "Question.6.1", "Question.6.2", 
"Question.7.1", "Question.7.2", "Question.8.1", "Question.8.2", 
"Question.9.1", "Question.9.2", "AQ.1", "AQ.2", "Task.1", "Task.2", 
"Task.3", "Task.4", "Task.5", "GQ.1", "GQ.2", "GQ.3", "GQ.4", 
"GQ.5", "GQ.6", "GQ.7", "GQ.8", "GQ.9", "GQ.10", "Feature.1", 
"Feature.2", "Feature.3", "Feature.4", "Feature.5", "Feature.6", 
"Feature.7"), class = "data.frame", row.names = c(NA, -15L))
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1 Answer

  1. Editorial Team

    I may have misunderstood the problem… but why don’t you just to run cor on the data frame?

    For instance:

    data <- data.frame(q1=sample(1:5, 15, rep=1), 
          q2=sample(1:5, 15, rep=1), 
          q3=sample(1:5, 15, rep=1), 
          q4=sample(1:5, 15, rep=1), 
          q5=sample(1:5, 15, rep=1), 
          q6=sample(1:5, 15, rep=1), 
          q7=sample(1:5, 15, rep=1), 
          q8=sample(1:5, 15, rep=1), 
          q9=sample(1:5, 15, rep=1), 
          q10=sample(1:5, 15, rep=1))

print(cor(data))

    You can even

    image(cor(data), x=1:10, y=1:10, zlim=c(-1,1))

    If you just need certain values of correlations just put the result of corr in a variable and pull out the results you need.

    For instance, we want the correlation of column 2 with columns 5 to 10 we will:

    corrs <- cor(data)
print(corrs[2, 5:10]) # or corrs[5:10, 2], the correlation matrix is symmetric
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