How do I get percentage changes instead of absolute levels in my Python data download?

Note that data on Nasdaq Data Link comes in two formats: time-series and tables. You can learn more about these formats here.

Time-Series 
To transform absolute levels to percentage changes, please use the transform="rdiff" parameter, like this:

data = quandl.get("XNAS/ACIW", transform="rdiff")
Please see here for other possible transformations for time-series data. Please see here for other examples of Python commands with time-series data.
Tables 
There is no transform= parameter for data in tables format. For tables, we recommend downloading the raw data and carrying out the required transformation using your own analytics tool.
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