Levels

[JockLawrie]

Hi there,

Is there appetite for a SetLevels transform that resets the levels of a column of scitype Finite?

Something along the lines of: SetLevels(:mycol, levels)

I often receive binary data with levels ["yes", "no"] and need to reorder them as ["no", "yes"], or simply recast them as [0, 1].

Another example is replacing alphabetical order with a more meaningful order.
E.g., ["large", "medium", "small"] changes to ["small", "medium", "large"]

[juliohm]

It would be nice to have a transform Levels(:col1 => levels1, :col2 => levels2, ...) that sets the levels of columns as you mentioned.

Can you help with a PR? :)

[juliohm]

@JockLawrie are you planning to work on this?

[Frank-III]

@JockLawrie are you planning to work on this?

I would like to work on this one. I suppose the syntax to be Levels(:cols1 => levels1, :col2 => level2; ordered = [:cols1, :cols3]) with the order keyword param to indicate the column we would like to set order to be true is ok?

[juliohm]

@Frank-III thank you for considering the contribution. Yes, the syntax is great. I will assign you to the issue and we can review the PR moving forward.

I was thinking if maybe this transform could be renamed to Categorical but we can think about it later when the PR is ready.

[juliohm]

Fixed in master.