You are able to get the latest S&P 500 estimate by the model. The parameter "last_GDP" was calculated from FRED's last update GDP data of 2016-04-01 and GDPnow
>last_GDP <- 16732.53
>last_UNDCONTSA <- 1015
>last_PAYEMS <- 144448
>3.358e+05-2.632e+00*last_PAYEMS-3.034e+02*last_UNDCONTSA-2.205e+01*last_GDP+2.405e-03*last_PAYEMS*last_UNDCONTSA+1.737e-04*last_GDP*last_PAYEMS+1.923e-02*last_UNDCONTSA*last_GDP-1.531e-07*last_GDP*last_PAYEMS*last_UNDCONTSA
[1] 2150.232
>last_GDP <- 16732.53
>last_UNDCONTSA <- 1015
>last_PAYEMS <- 144448
>3.358e+05-2.632e+00*last_PAYEMS-3.034e+02*last_UNDCONTSA-2.205e+01*last_GDP+2.405e-03*last_PAYEMS*last_UNDCONTSA+1.737e-04*last_GDP*last_PAYEMS+1.923e-02*last_UNDCONTSA*last_GDP-1.531e-07*last_GDP*last_PAYEMS*last_UNDCONTSA
[1] 2150.232
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