Description Usage Arguments Details Value See Also Examples

Returns a logical vector from a test of whether an object such as a matrix or VGLM object corresponds to a 'zero' assumption.

1 2 | ```
is.zero.matrix(object, ...)
is.zero.vglm(object, ...)
``` |

`object` |
an object such as a coefficient matrix of a |

`...` |
additional optional arguments. Currently unused. |

These functions test the effect of the `zero`

argument
on a `vglm`

object or the coefficient matrix
of a `vglm`

object.
The latter is obtained by `coef(vglmObject, matrix = TRUE)`

.

A vector of logicals, testing whether each linear/additive predictor
has the `zero`

argument applied to it.
It is `TRUE`

if that linear/additive predictor is
intercept-only, i.e., all other regression coefficients
are set to zero.

No checking is done for the intercept term at all, i.e., that it was estimated in the first place.

1 2 3 4 | ```
coalminers <- transform(coalminers, Age = (age - 42) / 5)
fit <- vglm(cbind(nBnW,nBW,BnW,BW) ~ Age, binom2.or(zero = NULL), coalminers)
is.zero(fit)
is.zero(coef(fit, matrix = TRUE))
``` |

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