regsum: For a polynomial regression, find x or y at y's peak or...
In forestgeo/ctfs: Tools for the Analysis of Forest Dynamics

Description Usage Arguments

This carries out either first or second order polynomial regression, finds the x- and y-values at y's peak if its second order, otherwise the x-intercept.

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regsum(x, y, poly = 1, graphit = F, yrange = c(-1, -1),
  yaxslab = "multiplier", newgraph = F, add = F, pts = T,
  ptype = 16, ltype = "solid")

`graphit`	Logical; if `TRUE` adds plot output.
`newgraph`	if FALSE, just graph to the screen and export is ignored; use TRUE to create a new plot window or export to a file.