STANDARDIZATIONEach ring's width is divided by the series' standard deviation S _{x} = √Σ(x_{t}-m_{x})^{2},
m_{x} is mean of series' widths
Each tree has its own Biological Growth Curvewhich is subtracted; e.g., exponential y _{t} = ae^{-bt}+k
Combined record shows influence of individual trees The individual growth curves are subtracted by subtracting a curve fit to the series. The combined series does not show the influence of individual trees' growth patterns |