pub fn tree_ring() -> Result<DataFrame, PolarsError>Expand description
§Yearly Treering Data, -6000-1979
§Description:
Contains normalized tree-ring widths in dimensionless units.
§Usage:
treering
§Format:
A univariate time series with 7981 observations. The object is of class ‘“ts”’.
Each tree ring corresponds to one year.
§Details:
The data were recorded by Donald A. Graybill, 1980, from Gt Basin Bristlecone Pine 2805M, 3726-11810 in Methuselah Walk, California.
§Source:
Time Series Data Library: https://robjhyndman.com/TSDL/, series ‘CA535.DAT’
§References:
For some photos of Methuselah Walk see https://web.archive.org/web/20110523225828/http://www.ltrr.arizona.edu/~hallman/sitephotos/meth.html