Data Interpolation giving negative values

[Anuradha Saikia]

I have used the following code
ipolate Shareholdersfunds Year, gen(SF) epolate by (ComapanyNUm) to interpolate missing values in my data.
where ComapanyNum is the Id in my panel data set.
But some of the new values generated as SF are negative.
Please suggest what do I do with negative values as shareholders' funds cannot be negative.

[Nick Cox]

Straight lines can go negative!

Interpolating logarithms and exponentiating the result would ensure positive results.

[Anuradha Saikia]

Thank you Sir Nick Cox

[Carlo Lazzaro]

Anuradha:
are you sure that you can simply -ipolate- without any previous diagnosis of the missing mechanism?

[Anuradha Saikia]

Yes Sir Carlo Lazzaro there is a doubt in that .