Combines two variables a, b
into a 2-column matrix, preserving label
and units
attributes and converting character or factor variables into integers and added a levels
attribute. This is used to combine censoring points with regular points. If both variables are already factors, their levels are distinctly combined starting with the levels for a
. Character variables are converted to factors.
Ocens(a, b = a)
a numeric matrix of class Ocens
variable for first column
variable for second column
Frank Harrell
Left censored values will have -Inf
for a
and right-censored values will have Inf
for b
. Interval-censored observations will have b
> a
and both finite. For factor or character variables it only makes sense to have interval censoring.
If there is no censoring, a
is returned as an ordinary vector, with label
and units
attributes.