"Maarten and Martin"... Never mind, the distinction is probably as subtle as
the -twoway- syntax...
HTH
Martin
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of George Hoffman
Sent: Wednesday, October 15, 2008 2:36 PM
To: [email protected]
Subject: Re: st: 'twoway' syntax subtlety
Thank you eva, martin,, and martin.
I have more learning to do - this is why I love STATA.
George
On 10/15/08 07:28 AM, "Eva Poen" <[email protected]> wrote:
> Well, the 'norm' option simply adds another -twoway- plot to the
> kernel density; if you are using -twoway- anyway, you can call it
> yourself:
>
> twoway (function y = normden(x,mean,sd))
>
> I reckon that allowing the 'norm' option in -twoway kdensity- would
> clash with general -twoway- behaviour (options for legends,
> xrange/yrange etc.).
>
> Eva
>
>
> 2008/10/15 George Hoffman <[email protected]>:
>> I'm trying to overlay two (or more) kdensity plots.
>>
>> kdensity accepts the 'norm' option
>> twoway kdensity does not - see log below
>>
>> I thought twoway calls kdensity - but I must have a misunderstanding of
>> stata 10 graphics....
>>
>> An explanation of principle would be most appreciated.
>> Thank you,
>> George Hoffman
>>
>>
>>
>> This my Stata 10 log:
>>
>> . two (kdensity rso2c if vmi85==0) (kdensity rso2c if vmi85==1)
>>
>> . two (kdensity rso2c if vmi85==0,norm) (kdensity rso2c if vmi85==1,norm)
>> option norm not allowed
>> r(198);
>>
>> . kdensity rso2c if vmi85==0,norm
>>
>> . two kdensity rso2c if vmi85==0,norm
>> option norm not allowed
>> r(198);
>>
> =
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