quantiles with approximately the same number of data points within each quantile?

By default I believe.  See

http://en.wikipedia.org/wiki/Quantile

Others more erudite may correct me.

What is a "good" way to create quantiles with approximately the same
number of data points within each quantile?

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Don McKenzie
Research Ecologist
Pacific Wildland Fire Science Lab
US Forest Service

Affiliate Professor
School of Environmental and Forest Sciences
University of Washington
dmck at uw.edu