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# Re: st: RE: CDF log-normal and histogram

 From Nick Cox To statalist@hsphsun2.harvard.edu Subject Re: st: RE: CDF log-normal and histogram Date Mon, 14 Feb 2011 12:17:45 +0000

```No; there is no such option. If there were, it would surely be documented.

(Your typo of "historgam" is easily corrected, and is not the issue.)

However, there is a solution similar in spirit to that conveyed to you earlier:

. sysuse auto, clear
(1978 Automobile Data)

. gen lnprice = ln(price)

. su lnprice

Variable |       Obs        Mean    Std. Dev.       Min        Max
-------------+--------------------------------------------------------
lnprice |        74    8.640633    .3921059   8.098947   9.674452

. histogram price, ///
legend(off) ///
(1 / (x * `r(sd)' * sqrt(2 * _pi))) * ///
exp(-(ln(x) - `r(mean)')^2 / (2 * `r(Var)')), ra(1 16000))

You'd need to check my formula, but the example looks about right.

Nick

On Mon, Feb 14, 2011 at 11:53 AM, Beatrice Crozza
<beatrice.crozza@gmail.com> wrote:
> Dear Nick and Maarten,.
>
>
> Is there a way to write the following command with a longnormal insted
> of a normal?
>
> histogram var1, freq normal
>
> I tried:
> historgam var1, freq lognormal
>
> but doesn't work.
>
> Thank you very much.
>
> Bea
>
>
>
> 2011/2/12 Maarten buis <maartenbuis@yahoo.co.uk>:
>> --- Beatrice Crozza
>>> I want to have a graph which combine the histogram of
>>> frequencies for my variable and on the same graph an
>>> empirical CDF of data and a fitted CDF (log-normal)
>>
>> --- On Fri, 11/2/11, Nick Cox wrote:
>>> Not the graph I would use in that territory.
>>>
>>> See -lognfit- (Stephen Jenkins, SSC) and -qlogn- from
>>> -qpfit- (SSC) for more critical choices.
>>
>> Yet another options that remains closer to the histogram
>> theme while solving some of the difficulties Beatrice's
>> graph would be -hangroot- (see: -ssc d hangroot- or
>> <http://www.maartenbuis.nl/software/hangroot.html>)
>>
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```