Standardization. Standardization. The last major technique for processing your tree-ring data. Despite all this measuring, you can use raw measurements only rarely, such as for age structure studies and growth rate studies.
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Notice different trends in growth rates among these different trees.
y = ax + b
y = ae -b
y = ae –b + k
Examples of Trend Fitting using Smoothing Splines
We go from this …
Index Series 1
Index Series 2
Index Series 3
This one curve represents information from hundreds of trees (El Malpais National Monument, NM).