Calculate Garza-Williamson M ratio (bottleneck) statistic for microsatellite data. The function is based on mRatio() from the strataG package. However, instead of requiring the same repeat length for all alleles within a locus, it calculates the m-ratio by deviding the allele-range by the repeat lengths that is most common. Is is therefore an approximation but maximises the amount of information used for non-optimally scored microsatellite datasets.

1 | ```
m_ratio(gtypes_geno, rpt_size = 8:2)
``` |

`gtypes_geno` |
microsatellite genotypes formatted as gtypes object with strataG |

`rpt_size` |
The size of potential repetitive units in a microsatellite. Default is from 8 to 2. |

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