Trend Ratio Normalization

[James A. Bowery]

Please add the capability of performing ratio normalization on trends.

For example, it should be possible to take the curve resulting from:

trump dark

and divide it by the curve resulting from:

trump

to get an idea of how the term "dark" in describing "trump" has changed over time.

Other arithmetic operations such as +, - and *, although already implicitly supported through various advanced search modifiers, would help clarify the measurement if made explicit.