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

Note that each data feed on Nasdaq Data Link is delivered through one of the following Nasdaq Data Link APIs:

• Streaming API for real-time data
• REST API for real-time or delayed data
• REST API for time-series
• REST API for tables

You can learn more about these APIs and data formats here.

Data that is delivered through the REST API for time-series or the REST API for tables may be used with the Nasdaq Data Link R package. 

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

data <- Quandl("XNAS/ACIW", transform="rdiff")