1- Histogram includes JSF pages to create aproximate equi-depth histogram of desired interval with quality guarantees.
2- HistogramSummarize is Apache Pig UDFs and HistogramSummarize.pig is script that create exact equi-depth histogram.
3-HistogramEstimate is Apache Pig UDFs amd HistogramEstimate.pig is script that create aproximate equi-depth histogram of desired interval with quality guarantees.