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A general description is here.
The ‘summary()’ method for ‘"lm"’ fits warns if the fit is essentially perfect, as some of the summary may be computed inaccurately (and with platform-dependent values).
The ‘sunspot.month’ dataset has been amended and updated from the official source, whereas the ‘sunspots’ and ‘sunspot.year’ datasets will remain immutable. The documentation and source links have been updated correspondingly.