selmod | R Documentation |

Select the mode in which the column has to be sign reversed. Below is an heuristic algorithm but a fully rational choice is hard to come by. Maximal number of sign reversals = p+q+r-2, but this number can be much smaller. Sign reverse a component, determine which if any of p, q and r is available for reversal. If one of them is wholly positieve way never choose it, else if one is wholly negative choose that one from A, B, C respectively; else if there is a component with a largest absolute value which is negative choose that one, or the one from A,B,C in that order; else choose the column of the longest mode; end if FreeA, FreeB, FreeC = 0 component is not available; = 1 component is available.

selmod(aptr, bptr, cptr, posptrA, negptrA, bigptrA, posptrB, negptrB, bigptrB, posptrC, negptrC, bigptrC, IA, IB, IC, I, J, K, p, q, r, longest)

`aptr` |
The pointer to the first component matrix. |

`bptr` |
The pointer to the second component matrix. |

`cptr` |
The pointer to the third component matrix. |

`posptrA` |
The pointer to the positive component of the first component matrix. |

`negptrA` |
The pointer to the negative component of the first component matrix. |

`bigptrA` |
The pointer to the biggest component (a larger negative positive value than a positive one) of the first component matrix. |

`posptrB` |
The pointer to the positive component of the first component matrix. |

`negptrB` |
The pointer to the negative component of the second component matrix. |

`bigptrB` |
The pointer to the biggest component (a larger negative positive value than a positive one) of the second component matrix. |

`posptrC` |
The pointer to the positive component of the third component matrix. |

`negptrC` |
The pointer to the negative component of the third component matrix. |

`bigptrC` |
The pointer to the biggest component (a larger negative positive value than a positive one) of the third component matrix. |

`IA` |
The pointer to the columns of the first component matrix, given the pointer to an element in core. |

`IB` |
The pointer to the columns of the second component matrix, given the pointer to an element in core. |

`IC` |
The pointer to the columns of the third component matrix, given the pointer to an element in core. |

`I` |
The row number of the three-way contingency table. |

`J` |
The column number of the three-way contingency table. |

`K` |
The tube number of the three-way contingency table. |

`p` |
The dimension number of the first mode. |

`q` |
The dimension number of the second mode. |

`r` |
The dimension number of the third mode. |

`longest` |
The component matrix of the longest mode to change sign (when no special reason for selection could be found). |

`success ` |
The flag variable to indicate if one of the components has to be sign reversed. |

`chgmode` |
Select the mode (1, 2 or 3) in which the column has to be sign reversed. |

`chgcomp` |
The pointer to the columns of the component matrices (A, B or C) |

Rosaria Lombardo and Pieter M Kroonenberg.

Kroonenberg PM (1994) The TUCKALS line: a suite of programs for three-way data analysis. Computational Statistics and Data Analysis, 18, 73–96.

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