Drops columns in a matrix to avoid perfect multicollinearity.

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`x` |
a matrix, possibly less than full column rank. |

`tol` |
numeric value. The tolerance for detecting linear dependencies among regressors, see |

`LAPACK` |
logical, TRUE or FALSE (default). If true use LAPACK otherwise use LINPACK, see |

`silent` |
logical, TRUE (default) or FALSE. Whether to print a notification whenever a regressor is removed |

Original function `drop.coef`

developed by Rune Haubo B. Christensen in package `ordinal`

, https://cran.r-project.org/package=ordinal.

a matrix whose regressors linearly independent

Rune Haubo B. Christensen, with modifications by Genaro Sucarrat, http://www.sucarrat.net/

Rune H.B. Christensen (2014): 'ordinal: Regression Models for Ordinal Data'. https://cran.r-project.org/package=ordinal

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