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st: RE: symmetric plots about the y-axis


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: symmetric plots about the y-axis
Date   Mon, 7 Feb 2005 00:23:51 -0000

By default, your function is drawn over the x range 
0 to 1. This is explicit in the help. 

So for example 

. twoway function y = x^2, ra(-3 3) 

will show the symmetry of the parabola around 
the y axis. 

Some further hints are contained in 

Stata tip 15: Function graphs on the fly. 
Stata Journal 4(4): 488--489 (2004) 

Nick 
n.j.cox@durham.ac.uk 

absc11@bangor.ac.uk
 
> When I try to draw a symemtric function about the y-axis, e.g.
> function y = x^2
> function y = cos(x)
> function y = tan(x)
> .etc
> 
> then I get only the half of the plot, the positive (x,y)'s.
> Also, the drawing of the plot stops at some arbritary point, 
> which I imagine is
> based on the number of points drawn.
> 
> How can I draw a symmetric parabola about the y-axis, and how 
> can I impose a
> more extend drawing of the function.
> 
> My specific interest has to do with plotting the upper limit 
> of distribution
> functions for skewness and kurtosis combinations, i.e. (b2 - 
> b1 =1), when
> skewness is expressed in square roots.

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