Create plant width estimator function

[jwnigel]

Many of the "Width" entries in pfaf are null, and it is essential to create the design.

So we need to create a reasonably accurate width estimator (Finally get to use some data analysis skills) :)
My initial idea is to create a height-width ratio for all plants. I assume trees have a larger ratio (more heigth to width) than shrubs so we could return a different ratio for different plants. Or look at the heigh-width ratio of members in the taxonomic family?

[berteh]

I'd rather keep it empty in the data, so we don't fill wrong data with no means of knowing what's accurate and what's a computed approximation.

But you're right the behavior needs one to be able to display and that's where the accessor method would still return a value when the data is empty, either default or half the height, for instance... but not populate the data and maybe even logging somewhere that this info is missing... for some day prompting the user to look it up and then correct the data.

[jwnigel]

Yes, great point that we don't want to fill the data.

I'll create a width method, for now in the design_data_class notebook to fill in when null