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Failed to parse (syntax error): {\displaystyle SURVSE_{\gamma,c-1}=\mathbf{SURVSE}^{t-1}_{\gamma,c-1}*\frac{AnalFunc(GDPPCP_{\gamma})}{AnalFunc(GDPPCP^{t-1}_{\gamma})}+\mathbf{CultShSE}^t_{\gamma-cultural}+\mathbf{survseadd}^t_{\gamma}}}

where

$CultShSE_{\gamma -cultural}^{t}=F(\mathbf {SURVSE} _{\gamma ,c-1}^{t-1},AnalFunc(GDPPCP_{\gamma }^{t-1})$