Dimitris,
This works for me. Is sample = 1 for all observations? Do you use
other options?
. sysuse auto, clear
. gen weight2 = 1.2*weight
. gen weight3 = 1.4*weight
. graph twoway kdensity weight || kdensity weight2 || kdensity
weight3
. graph twoway kdensity weight if foreign==1 || kdensity weight2 if
foreign==1 || kdensity weight3 if foreign==1
. graph twoway kdensity weight if foreign==0 || kdensity weight2 if
foreign==0 || kdensity weight3 if foreign==0
Friedrich Huebler
--- "D.Christodoulou" <[email protected]> wrote:
> My question concerns the use of -if expression- along with -graph
> twoway-.
> When I use the following command:
>
> graph twoway kdensity var1 if sample==1 || kdensity var2 if
> sample==1 ||
> kdensity var3 if sample==1 || ....
>
> ...Stata does not recognise the (repeated) restriction of the - if
> sample==1 - and plots the whole sample.
> All I want to do is restrict the sample in a comparable (and
> desirable)
> range for all kdensities.
>
> What is the correct way to do this?
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