How to write a search to calculate percentages for success and failure rates from my user log data?

I am trying to write a search that reports the percentage of total users impacted from log data. // All users will have this line recorded initializing user blah blah // success user will have this line recorded init succeeded // fail users will have a few variations init failed A init failed B How do I write a search that counts the occurrences of these strings and calculate a percentage from there? Also preferably, I would like to use the userid field to only count each user once. The report would look something like Total User | Success Rate | Failure Rates 53334 | 99% | 1% I tried using the append command to combine the counting of each result, but it is too slow. I was hoping for a more streamline answer. Thank you very much