Hi. I need to interpolate a time series which has 2 columns: date and numerical value. I know there is a Missing Value Note where you can select linear interpolation, however it does not take into account date value.
I think the easiest way to do this is to calculate the difference between the dates and some date in the past in days and then use the Linear Regression Learner and the corresponding predictor to fill in the blanks. You train the model with the data where you have values, then apply the predictor to the rows with missing values (use Row Splitter for this).