value_counts and groupby

[cc7768]

We should really cover this method in the summarize notebook -- The groupby example that uses count could be done with this.

Using value_counts might make a good precursor to groupby? Would have to think more about how to draw connection, but definitely should cover value_counts.

[sglyon]

I definitely talked about it in at least one of these advanced pandas lectures. Is it not in any notebook?

[cc7768]

It is. I must have missed it in the first pass as I was reviewing 🙍‍♂️