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Consider creating an aggregate filter, such as on SUM(Number of Records), by dragging a Measure to the Filter shelf. You can specify that the view only show results which are comprised of at least some minimum number of records.
In general it's difficult to build summary analysis while guaranteeing complete privacy. Research into differential privacy, linkage attacks, etc. shows that this is a very challenging topic. The technique I suggested is a very simple approach to a complex problem, so you should take extra precautions to validate your final reports to ensure they are protecting sensitive data.
I hope this helps,
Thank you, Robert. I will give this a try and provide an update as soon as I can.