Time Series Aggregation and Interpolation for Datasets of Varying Frequency

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<p>Equivalent to &#34;Proc Expand&#34; in SAS: http://support.sas.com/documentation/cdl/en/etsug/65545/HTML/default/viewer.htm#etsug_expand_examples01.htm.  Time series data is often sampled at different frequencies, monthly versus daily versus annual, etc.  There are two use cases - I'd like both of them to be covered.  1) Interpolating lower-frequency data to the rate of the higher-frequency series (same link as above), and 2) the opposite: see &#34;Combining Time Series with Different Frequencies&#34; @ http://support.sas.com/rnd/app/examples/ets/expa/.  This should ideally happen in the browser.  </p>
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