Computes linearized variable for the ratio estimator.

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`Y` |
Matrix of numerator variables. Any object convertible to |

`Z` |
Matrix of denominator variables. Any object convertible to |

`weight` |
Weight variable. One dimensional object convertible to one-column |

`Dom` |
Optional variables used to define population domains. If supplied, the linearized variables are computed for each domain. An object convertible to |

`percentratio` |
Positive integer value. All linearized variables are multiplied with percentratio value, by default - 1. |

The function returns the `data.table`

of the linearized variables for the ratio estimator.

Carl-Erik Sarndal, Bengt Swensson, Jan Wretman. Model Assisted Survey Sampling. Springer-Verlag, 1992, p.178.

`domain`

,
`vardom`

,
`vardomh`

,
`vardcros`

,
`vardchanges`

,
`vardchangannual`

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