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dbuf = ei(t,x,n,zb,zw);, where t, x, and n are $p\times 1$ vectors, zb is a scalar 1 for no covariates or a $p\times k^b$ matrix of covariates, and zw is the scalar 1 for no covariates or a $p\times k^w$ matrix of covariates (do not include a constant term). dbuf is an output data buffer.