Bookmark and Share

Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

st: Datamanagement: warning when using infile with optional if

From   <>
To   <>
Subject   st: Datamanagement: warning when using infile with optional if
Date   Tue, 28 Feb 2012 15:41:09 -0000

Dear all,

I am reading ASCII data with a dictionary using the command -infile-
whilst conditioning on an variable (using -if-) that is read in the same
time. I created a simplified example to show you what is happening:

The data looks like:

With dictionary file
dictionary using data.txt {
 _column(1)	int	id	%1f	"Identifier"
 _column(2)	str1	cat	%1s	"Category"
 _column(3)	int	dob	%2f	"Date of Birth"
 _column(5)	int	age	%2f	"Age"

My aim is to read only those lines where the variable cat is equal to B.
I do this by making use of the command
infile using dctB if cat=="B"

I do end up with the required result. Stata does a great job at
conditioning on a variable that it is reading at the same time, however,
it returns an error for every line where cat=="A" as it contains non
numeric characters, where Stata expects only integers. Not only does
this produce messy .log files (especially with thousands of lines), it
indicates that Stata has to read every line completely which is time
consuming and somewhat unnecessary. 

Does anyone have a suggestion to improve on my current method?
Preferably one that produces readable .log files?

Thanks for your consideration,

Arne Wolters
London School of Economics

Please access the attached hyperlink for an important electronic communications disclaimer:

*   For searches and help try:

© Copyright 1996–2018 StataCorp LLC   |   Terms of use   |   Privacy   |   Contact us   |   Site index