The function is used to obtain the method of moments estimator within the function `GVFCMOM`

.
Calculates the expected value of the Visual Fast Count method.
The function assumes that the count per segment is Poisson
with mean m/s and that segment counts are independent. The expected value is also a function of the number of
positives d before segment counting is stopped.

1 | ```
expected.pois(m, s, d)
``` |

`m` |
The underlying mean of the Poisson process per transect |

`s` |
The number of segments per transect |

`d` |
The numbner of positive counts before segment counting is stopped |

The expected value of the Visual Fast Count estimator

Jon Barry: Jon.Barry@cefas.co.uk

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