Fig. 5From: Evaluating the productivity of ancient Pu’er tea trees (Camellia sinensis var. assamica): a multivariate modeling approachFinal structural equation model with key variables and coefficients. Latent variables are drawn in ellipses, and observed variables are drawn in rectangles. Standardized regression weights are shown as solid arrows, and observed variables indicating latent variables are shown as dotted arrows. The coefficient (− 0.619) from environmental suitability to management was not of interest and thus omitted. The red box indicates the relationships among key models. The line thickness indicates the magnitude of the coefficient values. Coefficients next to arrows indicate standardized regression weightsBack to article page