Add confidence intervals for imputations

[SteffenMoritz]

Something similar to the forecast package would be nice. (forecast has also nice plots with confidence intervals)

[Joonaspraks]

How would you approach calculating confidence intervals for imputations on missing values? I have failed thus far in finding any accommodating materials on the subject. Maybe multiple imputations with bootstrapped time series?

I would really enjoy displaying some metrics alongside the imputed values to gain some caution when including them in future analysis.

Great package by the way! Seasonal splitting + kalman smoothing have been working out very well. Thank you