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Your first question is not really on-topic on this site, but what you decide to think about it might have consequences for the modeling. You should also ask yourself why gender is missing at such a large rate, might it have to do with people actively refusing to answer? So, depending on context and goals, missing might be informative, so just dropping might ...


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You should first satisfy yourself that the intended sum makes sense: only values measured in like units can be added. Next you should ask yourself whether the series you try to add are "stocks" or "flows", to use the common econometric jargon. A stock is a variable which has a meaningful instantaneous value (e.g. voltage, interest rate) ...


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It is not necessarily inappropriate to use a univariate model (as is done by imputeTS::na_kalman) for this, although it may not be optimal, for two reasons: Estimates of missing observations are not data, and this matters quite a bit more when observations are not independent. This implies that, if you then fit another multivariate model based on these ...


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