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standard deviation by hour for last business week and compare it with today's numbers for the same hour

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I need help with framing a query which gives me the standard deviation of 5 values (for last business week) and compare the same with today's traffic for the same hour and trigger an alert if the difference is more than x%

All i could get was the values for the same hour ever business day last week using simple chart command and I couldn't go past that.

index=ABC sourcetype=DEF uri="/sample/event/test" earliest=-6d@w1 AND latest=-1d@w6 date_hour>5 date_hour<=18 | chart limit=100 span=1h dc(unique_id) over date_hour by date_mday


date_hour   19  20   21 22  23
  7        60366  61630  62768 62533 64369

I need data in this below format or at least the 3 values I am looking for

StdDev(Last business week between 8 am - 9 am ET)    Current_Hour's_Traffic       DIfference_In_%
             500                                           450                        10

Thanks a lot.

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