Fig. 2

LASSO regression model screening risk factors

Variable selection by the LASSO regression model. A coefficient profile plot was constructed against the log(lambda) sequence. A: Eleven variables with nonzero coefficients were selected by deriving the optimal lambda. Choice of the optimal parameter (λ) in the LASSO regression model with logλ as the horizontal coordinate and regression coefficients as the vertical coordinate; B: Plot of λ versus number of variables with logλ as the bottom horizontal coordinate, model error value as the vertical coordinate, and number of variables as the top horizontal coordinate.