--- "Vladimir V. Dashkeyev" <[email protected]> wrote:
> I drew a two-way plot with a linear prediction line -lfitci- of X on
> natural logarithm of Y. Next, I drew the plot of X on Y with log
> scale option -yscale(log)-.
>
> To my surprise regression line changed its slope. The slope is
> greater with the -yscale(log)- option. I used the same X axis and
> the second Y-axis for the linear prediction graph .
> Is this a bug or am I doing something wrong?
This is not a bug: in the first scenario you are thinking that there is
a linear relationship between ln(Y) and X and you are showing the
predictions, while in the second scenario you are thingking that there
is a linear relationship between Y and X and then transforme the
predictions to a log scale. So the results are different because the
models are different.
-- Maarten
-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands
visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434
+31 20 5986715
http://home.fsw.vu.nl/m.buis/
-----------------------------------------
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