Another classical approach to transforming a time series from an irregular to regular, and/or altering the sampling interval associated with the time series, is to apply a resampling function to the series. Resampling functions generally take as an input: a time series, which can be regular or irregular to begin with; a starting point, aka, 'time-zero'; and a desired target sampling interval. There are usually multiple choices available to the data scientist as to how the interpolation associated with the sample interval change is going to occur.
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