I am not really sure what it is you are asking - if you want the variance of the MaxTPS for each day compared to the MaxTPS 7 days prior, try this index=<search string> earliest=-30d@d date_hour>=$timefrom$ AND date_hour<$timeto$
| timechart span=$TotalMinutes $m count(eval(searchmatch("sent"))) as HotCountToday
| eval TPS=round(HotCountToday/($TotalMinutes $*60),2)
| eval TotalMinutes = ($timeto$ - $timefrom$) * 60
| eval Day=strftime(_time, "%Y-%m-%d")
| stats max(TPS) as MaxTPS by Day
| autoregress MaxTPS p=7
| eval Variance_TPS_Today=case(MaxTPS_p7 > MaxTPS, round(((MaxTPS_p7 - MaxTPS) / MaxTPS_p7) * 100,2),MaxTPS_p7 < MaxTPS, round(((MaxTPS - MaxTPS_p7) / MaxTPS) * 100,2),MaxTPS_p7 = MaxTPS, round(((MaxTPS_p7 - MaxTPS)) * 100,2))
| eval Date=strftime(_time,"%F")
| eval Name="Test"
| chart useother=f values(Variance_TPS_Today) as variance by Name Date
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