MillsRatio | R Documentation |

Calculates the Mills ratio

```
millsR(y, log = FALSE)
```

`y` |
Numeric. Value at which the Mills' Ratio is evaluated. |

`log` |
Logical. If |

The function calculates the Mills' Ratio.
Since the Mill's Ratio converges to zero for large positive `z`

and infinity for large negative `z`

. The range over which the
logarithm of the Mill's ratio may be calculated is greater than that
for which the Mill's ratio itself may be calculated.

The Mills' Ratio is

`R(z)=\frac{1-\Phi(z)}{\phi(z)}`

where `\Phi(z)`

and `\phi(z)`

are
respectively the distribution function and density function of the
standard normal distribution.

David Scott d.scott@auckland.ac.nz, Jason Shicong Fu

```
## compare millsR calculated directly with the millsR calculated
## by transforming to log scale and then back-transformed
millsR(1:10)
exp(millsR(1:10, log = TRUE))
exp(millsR(10*(1:10)))
exp(millsR(10*(1:10), log = TRUE))
```

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