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| > rowSums(table(mtcars$gear, mtcars$cyl)) | |
| 3 4 5 | |
| 15 12 5 |
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| > myCars<-table(mtcars$gear, mtcars$cyl) | |
| > str(myCars) | |
| 'table' int [1:3, 1:3] 1 8 2 2 4 1 12 0 2 | |
| - attr(*, "dimnames")=List of 2 | |
| ..$ : chr [1:3] "3" "4" "5" | |
| ..$ : chr [1:3] "4" "6" "8" |
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| > myCars[1:2,] | |
| 4 6 8 | |
| 3 1 2 12 | |
| 4 8 4 0 |
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| > myCars[1,] | |
| 4 6 8 | |
| 1 2 12 |
NyaGarcia
/ rows-cols.r
Created
March 18, 2020 20:37
Showing the first two rows of the first two columns
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| > myCars[1:2,1:2] | |
| 4 6 | |
| 3 1 2 | |
| 4 8 4 |
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| > myCars["3",] | |
| 4 6 8 | |
| 1 2 12 |
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| > myCars[,"8"] | |
| 3 4 5 | |
| 12 0 2 |
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| > ftable(mtcars$cyl, mtcars$carb, mtcars$gear) | |
| 3 4 5 | |
| 4 1 1 4 0 | |
| 2 0 4 2 | |
| 3 0 0 0 | |
| 4 0 0 0 | |
| 6 0 0 0 | |
| 8 0 0 0 | |
| 6 1 2 0 0 |
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| > ftable(mtcars$cyl, mtcars$carb, mtcars$gear, mtcars$vs) | |
| 0 1 | |
| 4 1 3 0 1 | |
| 4 0 4 | |
| 5 0 0 | |
| 2 3 0 0 | |
| 4 0 4 | |
| 5 1 1 | |
| 3 3 0 0 |
NyaGarcia
/ mantelhaen.r
Created
March 18, 2020 21:20
Testing for independence in a three way contingency table with Mantel-Haenszel Test
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| > mantelhaen.test(mtcars$cyl, mtcars$carb, mtcars$gear) | |
| Cochran-Mantel-Haenszel test | |
| data: mtcars$cyl and mtcars$carb and mtcars$gear | |
| Cochran-Mantel-Haenszel M^2 = 30.212, df = 10, p-value = 0.0007908 |