Implement and test code for filtering LOINC codes

[pnrobinson]

• write a filter that demands that we have at least 2 abnormal lab values in one patient in order to call the HPO term
• write a filter that demands that we have at least 50% of results of a certain lab values are abnormal in one patient in order to call the HPO term
• Repeat the logistic regression analysis with this dataset

[C-1337ka]

not currently in Python version

[iimpulse]

Now that pre-processing will be done in loinchpo package via #19 . We want to implement a tranform filter for loinchpo based on these patient level loinc codes.

• Acceptance criteria will be to analyze this filter either on synthetic data for n3c data.

[iimpulse]

I've changed this to low priority as we are still working out what this will look like.