Re: [Gretl-users] Occasional problem with scatterplots
On Mon, March 13, 2006 15:49, Sven Schreiber wrote:
I agree with Sven. I'd rather have it turned off by default in any case, with
the option of plotting it if wanted. After all, if the data points align on a
stright line by themselves, the least squares interpolation gives little more
information, no?
Allin Cottrell schrieb:
> The OLS fitted line is displayed in a scatter plot only if the slope
coefficient is significant at the 10 percent level. (If you want an actual
versus fitted graph regardless of the significance of the fit, you can
estimate an OLS model and explicitly request such a plot via the menus).
Good to know, because during lectures I couldn't explain to my students why
the
line was sometimes there, sometimes not. To be honest, I think it's
better to not make it dependent on significance. At the stage of plotting
without estimating a model, I would never have guessed that already some
testing was going on.
> A feature that might be nice to have is the option of adding
various sorts
of fitted line to any X-Y scatter: linear, quadratic,
> exponential... but I don't want to hold up version 1.5.1
waiting for that
right now.
Yes on both accounts.
I agree. What I'd like even better would be different symbols for different
groups, like John suggested earlier. But this is not vital IMO, let's put it
off after release.
Riccardo "Jack" Lucchetti
Dipartimento di Economia
Facoltà di Economia "G. Fuà"
Ancona