I implement cubic spline interpolation as described here to disaggregate a low-frequency series to a higher-frequency series, subject to an additivity constraint (appropriate for flows such as GDP or indexes such as CPI).

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TagTime Visualizer is an R/Shiny app that grew out of some R scripts I made to visualize my TagTime data (TagTime uses sampling to estimate time use). If you use TagTime, this is probably the best way to make pretty and informative graphs of your data (at least as of early 2015). You can access the app here (repo); a demo with some of my own data is here (repo).

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