The National Institute of Standards and Technology (NIST) has an on-line guide to process statistics, called Engineering Statistics Handbook. The guide makes use of a public domain software called Dataplot. I'm thinking of using that guide for a statistics study, and perhaps installing Dataplot to better follow the case study examples. However, checking around on the web I don't seem to find many people using Dataplot. Is that software worth the bother to install and learn? I ask that anyone here who has used Dataplot please share their opinions about it. Thank you.