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 Feb 2019

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rob_se < list(sqrt(diag(vcovHC(fatalities_mod1, type = "HC1"))), sqrt(diag(vcovHC(fatalities_mod2, type = "HC1"))), sqrt(diag(vcovHC(fatalities_mod3, type = "HC1"))), sqrt(diag(vcovHC(fatalities_mod4, type = "HC1"))), sqrt(diag(vcovHC(fatalities_mod5, type = "HC1"))), sqrt(diag(vcovHC(fatalities_mod6, type = "HC1"))), sqrt(diag(vcovHC(fatalities_mod7, type = "HC1"))))
Error in solve.default(crossprod(demX)) : system is computationally singular: reciprocal condition number = 1.63237e31
