Try this:
source="vx-fcr.csv" host="vx-contacts" sourcetype="csv-vx-fcr" date_year = 2015 earliest=-60d | eventstats sum(count_fcr_eligible_cases) as total | timechart span=1w first(total) AS total sum(a) AS sumA BY b | eval sumA=sumA/total
And this:
source="vx-fcr.csv" host="vx-contacts" sourcetype="csv-vx-fcr" date_year = 2015 earliest=-60d | eventstats sum(count_fcr_eligible_cases) as total | timechart span=1w first(total) AS total sum(a) AS sumA | eval sumA=sumA/total
Don't forget to click "Accept" to close out the Question if it works.
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