Adequate moisture and a long growing season result in a wide ring, while a drought year may result in a very narrow one. Annual Review of Earth and Planetary Sciences. Dendrochronologists originally carried out cross-dating by visual inspection; more recently, they have harnessed computers to do the task, applying statistical techniques to assess the matching. Since panels of seasoned wood were used, an uncertain number of years has to be allowed for seasoning when estimating dates.
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The formula is useful for correct approximation of samples data before data normalization procedure.