Description Usage Arguments Value Author(s)

Creates cubic terms that are used by the function MixModel when fitting model (3)

1 | ```
cubic(a, b)
``` |

`a` |
input - vector of mixture components in a column in the data frame |

`b` |
input - another vector of mixture components in a column in the data frame |

vector of elementwise a^2*b-a*b^2 function of terms in the a and b vectors

John Lawson

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