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Re: st: checking data using assert


From   Sergiy Radyakin <serjradyakin@gmail.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: checking data using assert
Date   Tue, 28 May 2013 22:53:31 -0400

This does not look like a job for assert. List seems a better fit.

On Tue, May 28, 2013 at 10:00 PM, Raoul Reulen <r.c.reulen@bham.ac.uk> wrote:
> Hi All,
>
> I am currently running several do-files in order to check data. I would like Stata to check whether a certain

1. count if dob>=dod

statement is true, e.g. date of birth (dob) < date of death (dod). If
it is not true I want it to display a message
saying what the problem is and display the ID numbers for those
records were the statement was not true. Lastly,
2. list id if dob>=dod

I want to list several variables (e,g. id, dob, dox) to inspect the
actual problem.
3. list id dob dox if dob>=dod

>
> I have done the following, but wondered if there are easier/more efficient ways of doing it?
>
> ******************************
> .gen byte tag = dod <  dob
> .qui:  levelsof   id    if tag==1
> .cap: assert  tag==0
> .if _rc di _new as err  "date of death before birth date; see id:   " as text "`r(levels)'"
> .list id dob dod  if tag==1 , noobs N
> .drop tag
> ******************************

Perhaps:

sysuse auto, clear
generate id=_n
count if price>5000
if (r(N)>0) {
    display as error "Wow!Some cars are too expensive for me.Just look at them:"
    levelsof id if (price>5000)
    list id price make if (price>5000)
}

In any case it is safer to use a tempvar instead of 'tag' in your code.

If you are trying to avoid levelsof for any reason, perhaps Mata?

tempvar touse
generate touse=price>5000
mata st_view(V=.,.,"id","touse")
mata V'


Best, S.R.


>
> Many thanks for help! Appreciated as usual!
>
> All the best
>
> Raoul
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