There is no reason to expect -if- to accept
value labels in this way. Unless explicitly
instructed, -if- deals with values, not
value labels. Thus
if ncyear == 2000/1
is being interpreted as
if ncyear == 2000
as the expression 2000/1 evaluates
to 2000. On the other hand you evidently
have no years that are 2001/2, i.e. 1000.5.
The syntax is
if <exp>
where <exp> denotes an expression, which will
be evaluated before being used.
On the other hand, something like this
should work:
tab ncyear if ncyear == "2000/1":name
Nick
[email protected]
Paul O'Brien
> I am not sure what the problem is here, but 'if' is not working for
> some date labels.
> year_f is OK up to 2000/1 but beyond that give no observations.
>
> .egen year_f = ncyear(date_v), m(4)
>
> . table year_f
> ----------------------
> ��year_f |�����Freq.
> ----------+-----------
> �1997/98 |����44,023
> �1998/99 |����42,654
> ��1999/0 |����42,944
> ��2000/1 |����42,127
> ��2001/2 |����41,520
> ��2002/3 |����41,463
> ��2003/4 |����40,057
> ----------------------
>
> . table ageint if year_f==2000/1
>
> ----------------------
> ��ageint |�����Freq.
> ----------+-----------
> ������12 |���������5
> ������13 |��������36
> ������14 |�������131
> ������15 |�������346
> etc
>
> . table ageint if year_f==2001/2
>
> no observations
>
> r(2000);
>
> But there are observations for year_f==2001/2
>
> �. table ageint year_f
>
> --------------------------------------------------------------
> ----------
> -
> | year_f
> ageint | 1997/98 1998/99 1999/0 2000/1 2001/2 2002/3
> 2003/4
> ----------
> +--------------------------------------------------------------
> 10 | 1 1 2
> 1
> 1
> 11 | 2 2 2 1
> 2
> 1
> 12 | 2 3 2 5 4
> 3
> 7
> 13 | 13 20 17 36 22
> 20
> 12
> 14 | 73 49 64 131 110
> 101
> 99
> 15 | 238 259 238 346 362
> 302
> 325
>
> If I try -list- I get the same thing:
>
> . list if year_f==2000/1
>
> �Observation 129622
>
> ���clin_s~e����������RC���clin_w~k������������������connum����
> �������2��
> �����date���15-Feb-01��������dob���04-Apr-63
>
> etc
>
> �
> Observation 129623
>
> ���clin_s~e����������RC���clin_w~k�������D-
> CON�����connum�����������1�������date���07-Feb-01��������dob���06-Apr
> -77
>
> etc
>
> . list if year_f==2001/2
>
> This last command gives nothing.
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