handling missing values

[mkborregaard]

AlgebraOfGraphics don't seem to handle missing values the same as Makie. Consider

Using dropmissing on the full DataFrame is not viable, as the missings are likely to be in columns you don't use. A workaround is

data(dropmissing(allison, [:BodyWt, :Gestation])) *
	mapping(:BodyWt, :Gestation) |> 
        draw

but I believe you would expect AoG to handle missing like Makie (and it would be more user friendly - the current behaviour seems like a bug.)

[grahamas]

The discrepancy between what I would expect (and Makie does) and what AoG does is more pronounced for line graphs: I want the missing data points to break the line (i.e. be missing). AoG by default instead maps those values to max+1, as seen above, and even the proposed workaround doesn't fix the issue: dropmissing doesn't break the line but links the surrounding points, so that there's a potentially misleading line passing through the "missing" datapoints.

[jariji]

I would rather get an error and pass skipmissing=true where needed rather than have incomplete and misleading results by default. Maybe there could even be a functional "preprocessing" API similar to the Analysis API which would allow transforming the data prior to plotting.

data(d) * preprocess(dropmissing) * ...