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# RE: st: twoway scatter ..., yscale(log) with axis on log and arithmetic scales

 From Joana Cunha-Cruz <[email protected]> To [email protected] Subject RE: st: twoway scatter ..., yscale(log) with axis on log and arithmetic scales Date Mon, 20 Oct 2008 11:07:57 -0700 (PDT)

```Dear Nick,
Thank you!
It worked well. I'll use log10.
Thanks again.
Joana

--- On Sun, 10/19/08, Nick Cox <[email protected]> wrote:

> From: Nick Cox <[email protected]>
> Subject: RE: st: twoway scatter ..., yscale(log) with axis on log and arithmetic scales
> To: [email protected]
> Date: Sunday, October 19, 2008, 8:30 AM
> If the readership is unfamiliar with logarithms, they will
> probably feel
> more comfortable with base 10 logarithms. Clearly, using
> -log10()- not
> -log()- would answer that.
>
> Nick
> [email protected]
>
> Maarten buis
>
> --- Joana Cunha-Cruz <[email protected]> wrote:
> > What I want with the graph is to show the values of
> the data on both
> > scales (for the reader not familiar with log scale,
> they can see how
> > the numbers correspond from one scale to the other).
>
> Notice that by default the numbers on the axes are still on
> the
> original (not log) scale, so I think adding extra axes with
> the log
> values just adds confusion to those unfamiliar with them,
> rather than
> solves it. If you still want to do that than this is how
> you do it:
>
> *--------------------- begin example
> --------------------------
> sysuse auto, clear
> twoway scatter price mpg, yscale(log) xscale(log)
> forvalues n= 5000(5000)15000{
> 	local ylab `ylab' `n'
> "`=string(log(`n'),"%9.2f")'"
> }
> forvalues n = 10(10)40 {
> 	local xlab `xlab' `n'
> "`=string(log(`n'),"%9.2f")'"
> }
>
> twoway scatter price mpg, yaxis(1) xaxis(1)        ///
>        yscale(log axis(1)) xscale(log axis(1)) ||  ///
>        scatter price mpg, yaxis(2) xaxis(2)        ///
>        yscale(log axis(2)) xscale(log axis(2))     ///
>        ylab(`ylab', axis(2)) xlab(`xlab', axis(2))
> ///
>        msymbol(i) legend(off)                      ///
>        ytitle("ln(price)", axis(2))
>  ///
>        xtitle("ln(mpg)", axis(2))
> *--------------------- end example
> ----------------------------
> (For more on how to use examples I sent to the Statalist,
> see
> http://home.fsw.vu.nl/m.buis/stata/exampleFAQ.html )
>
> *
> *   For searches and help try:
> *   http://www.stata.com/help.cgi?search
> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/

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