After df.groupby(“region”).sum(), the “region” column is now:

TF-IDF up-weights words that:

An outer join of two DataFrames returns:

A bigram is:

A patient is NPO. This means that the person:

Two DataFrames have a key column with different names (“user_id” in one, “uid” in the other). To merge them on that key:

Which Streamlit widget is best for selecting multiple values from a list?

To convert a wide DataFrame (one column per metric) to long format (one row per observation):

A data warehouse is best characterized as:

In a Bag-of-Words representation, each entry of the vector for a document is: