Description Usage Arguments Value Author(s) See Also Examples

These functions are used to find all possible binary partitions. Finding all combinations require a classification vector with K > 1 strata.

1 2 3 |

`x` |
a vector for |

`collapse` |
character, what to paste between levels.
Defaults to |

`k` |
numeric, number of levels (strata) in a given classification (K > 1). |

`kComb`

returns a contrast matrix corresponding to
all possible binary partitions of the factor with K levels.
Complements are not counted twice, i.e.
(0,0,1,1) is equivalent to (1,1,0,0).
The number of such possible combinations is M = 2^(K - 1) - 1.

`allComb`

takes a classification vector with at least 2 levels
and returns a model matrix with binary partitions.

`checkComb`

checks if combinations are unique and non-complementary
(misfits are returned as attributes). Returns a logical value.

Peter Solymos <[email protected]>

`opticut`

for the user interface.

`rankComb`

and `lorenz`

for alternative partitioning algorithms.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 | ```
kComb(k = 2)
kComb(k = 3)
kComb(k = 4)
## finding all combinations
(f <- rep(LETTERS[1:4], each=2))
(mc <- allComb(f, collapse = "_"))
## checking for complementary entries
checkComb(mc) # TRUE
## adding complementary entries to the matrix
mc2 <- cbind(z = 1 - mc[,1], mc[,c(1:ncol(mc), 1)])
colnames(mc2) <- 1:ncol(mc2)
mc2
checkComb(mc2) # FALSE
``` |

psolymos/opticut documentation built on April 29, 2018, 10:17 a.m.

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