scaling r dataframe to 0-1 with NA values [duplicate]

Answer 1

Here's the answer from the 2nd question you link:

function(x) {(x - min(x)) / (max(x) - min(x))}

We can modify this to work with NAs (using the built-in NA handling in min and max

stdize = function(x, ...) {(x - min(x, ...)) / (max(x, ...) - min(x, ...))}

Then you can call it and pass through na.rm = T.

x = rexp(100)
x[sample(1:100, size = 10)] <- NA
stdize(x)  # lots of NA
stdize(x, na.rm = T) # works!

Or, using the o data frame from your question:

o_std = lapply(o, stdize, na.rm = T)

The NAs will still be there at the end.