Properties that most impact each school district's property taxes

[wrridgeway]

See #627

[wrridgeway]

@ccao-jardine I defined eav as

(pin.av_board - (
        pin.exe_homeowner
        + pin.exe_senior
        + pin.exe_freeze
        + pin.exe_longtime_homeowner
        + pin.exe_disabled
        + pin.exe_vet_returning
        + pin.exe_vet_dis_lt50
        + pin.exe_vet_dis_50_69
        + pin.exe_vet_dis_ge70
        + pin.exe_abate
    )) * fact.eq_factor_final

is that right? do we want to use av_clerk for things like ranking and eav rather than av_board?

[ccao-jardine]

Almost! To get taxable EAV, you'll want AV * equalizer, then subtract out exemptions and abatements, because those are in units of EAV.

( 
 (pin.av_board * fact.eq_factor_final) 
   - (pin.exe_homeowner
        + pin.exe_senior
        + pin.exe_freeze
        + pin.exe_longtime_homeowner
        + pin.exe_disabled
        + pin.exe_vet_returning
        + pin.exe_vet_dis_lt50
        + pin.exe_vet_dis_50_69
        + pin.exe_vet_dis_ge70
        + pin.exe_abate)
 ) AS eav

It might be helpful to rename eav to taxable_eav to make it clear that this is the FInal EAV, as in the taxable, post-exemption EAV.

I'd QC it by finding a few PINs with/without exemptions and an abatement, multiplying taxable EAV by the cumulative rate, and seeing if it equals the tax bill.

I'm sure my parentheses styling is off, but I ain't ashamed.

[ccao-jardine]

Change proposed for EAV calculation, thanks!