152 bug dnam qc pipeline sex check thresholds

[ejh243]

Description

This pull request will make the sex check in the DNAm preprocessing pipeline more robust against hard coded thresholds, and more adaptable in the long term for changes to the technology.

It does require a certain number of samples basic testing would indicate at least 20, and is designed for the situation where you have at least two sexes present in the data. While I have tried to account for a single sex dataset, I have not been able to test this. Equally the behaviour in this situation might require some further consideration.

Issue ticket number

This pull request is to address issue: #152 .

Type of pull request

• Bug fix
• New feature/enhancement
• Code refactor
• Documentation update

Checklist

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have tested my code to check that it is functional
• I have used linters to check for common sources of errors
• I have implemented fail safes in my code to account for edge cases
• I have made the corresponding changes to the documentation