Adding to Nick's comment, -duplicates list- may be the one for you if
are simply after seeing the list:
. duplicates list headroom trunk if trunk==8 & head==2
Duplicates in terms of headroom trunk
+-------------------------+
| obs: headroom trunk |
|-------------------------|
| 7 2.0 8 |
| 8 2.0 8 |
+-------------------------+
Eva
2008/9/3 Nick Cox <[email protected]>:
> As I understand it, the only thing the -tag- subcommand is designed to
> do is -generate- a new variable with specific properties.
>
> It doesn't -list- or otherwise display what it produces.
>
> Think of what -generate- does. You ask for a new variable. If the syntax
> is correct,
> you will get one. If you want to look at it, you need to follow up with
> some other command.
>
> In your example, following with
>
> . l headroom trunk dup_admission_id if trunk == 8
>
> +-----------------------------+
> | headroom trunk dup_ad~d |
> |-----------------------------|
> 20. | 2.0 8 1 |
> 45. | 1.5 8 0 |
> 57. | 2.0 8 1 |
> 58. | 2.5 8 1 |
> 59. | 2.5 8 1 |
> +-----------------------------+
>
> will show what -duplicates tag- did for you.
>
> Nick
> [email protected]
>
> Michael McCulloch
>
> I'm testing -duplicates tag-, and puzzled as to why it won't show the
> two observations where headroom==2.0 and trunk==8.
>
> clear
> sysuse auto
> list foreign headroom trunk if trunk==8
> duplicates tag headroom trunk, generate(dup_admission_id)
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