Will Vining

It might fill some of the gap, for these kind of small workflows, if we added a "cookbook" to the docs. I think it is still early days and without...

I think this would be a very good addition to PVAnanlytics! It seems almost indispensable for any kind of automated analysis. I like the `group_columns()` function. In the PVAnalytics style...

I was thinking about this in terms of quality control on the column names, not so much about identifying which sensors/equipment exist. I could see it going in `system` when...

When I read `io` I think of functions for interacting with some external resource (a database, a file, or something on the network) as opposed to just identifying/manipulating column names...

We already have a `pvanalytics.util` module that could work. It doesn't currently have any public API functions, but I don't see why it couldn't.

@rjstephens Definitely a good idea to implement the simple filter first. I haven't gotten around to it yet. I like your suggestion to look for multiple occurrences of each value.

We may want to add performance ratio calculations, but computing theoretical energy production is the domain of [pvlib-python](github.com/pvlib/pvlib-python). `pvlib-python` and `pvanalytics` are split roughly between the modeling PV system performance/produciton...

#69 added NREL's weather corrected performance ratio. Is that enough to close this out, or should we keep it open to track other performance ratio methods that we might want...