getSlopeR2()

Fit a Zipf trendline to a set of ranks and counts.

getSlopeR2(ranks, counts)

Fits a trendline to the rank-against-count plot on a log-log scale and returns its slope, fit, and y-intercept. If the slope or fit cannot be worked out, zero is returned for it. Two special cases: a single repeated value (a vertical trendline) gives a slope and fit of 0; a perfectly even spread (a horizontal trendline) gives a slope of 0 and a fit of 1.

Parameters

getSlopeR2(ranks, counts)

Parameter	Type	Default	Description
ranks	list[int or float]	required	The rank (the x value) for each count.
counts	list[int or float]	required	How often each item occurs.

Returns

return slope, r2, yint

Value	Type	Description
slope	float	The slope of the fitted trendline.
r2	float	How well the trendline fits the data, from 0.0 to 1.0.
yint	float	The trendline's y-intercept.