an object of class "lmRob".

character string. Valid choices are "bias" for bias test, or "permutation" for permutation test.

the level of the test for bias of MM-estimate. By default, the level component of object$robust.control is used.

a positive integer value specifying the number of permutations to use.

a list describing the test of bias for final MM-estimates, with the following components: stat, the t-statistic; pchi, a chi-squared p-value; qchi, the quantile of the chi-squared distribution with degrees of freedom equal to object\$rank corresponding to the probability input in the level (object$robust.control$level).

a list describing the test of bias for LS-estimates, with the following components: stat, the t-statistic; pchi, a chi-squared p-value.

the level of the test for bias of MM-estimate.