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I'm working on a problem where in I have some data sets about some power generating units. Each of these units have been activated to run in the past and while activation, some units went into some issues. I now have all these data and I would like to come up with some sort of Ranking for these generating units. The criteria for ranking would be pretty simple to start with. They are: 1. Maximum number of times a particular generating unit was activated 2. How many times did the generating unit ran into problems during activation Later on I would expand on this ranking algorithm by adding more criteria. I will be using Apache Spark MLIB library and I can already see that there are quite a few algorithms already in place. http://spark.apache.org/docs/latest/mllib-guide.html I'm just not sure which algorithm would fit my purpose. Any suggestions?