My report is a "cross tab". The report is grouped by ProviderGroup and counts the number of admissions per month. The columns are YearMonth, i.e. 2014-01, 2014-02, 2014-03, through current month. The current month will have considerably fewer admissions than the previous months depending on when it is run. I want to average the previous nine months, excluding the current month. Any thoughts?
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