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st: 回复: st: re: missing string entry


From   lydia huang <lydiahsh@yahoo.com.cn>
To   statalist@hsphsun2.harvard.edu
Subject   st: 回复: st: re: missing string entry
Date   Tue, 9 Mar 2010 11:46:25 +0800 (CST)

i typed 

replace nosocomial_infection = "NULL" if mi(nosocomial_infection)

and it says "unknown function mi()".
what does this mean? how solve it? I want to change all the missing string variables into "null", do i type the following?

replace _all = "NULL" if mi(_all)

Best wishes
Lydia

--- 10年3月9日,周二, Kit Baum <baum@bc.edu> 写道:

> 发件人: Kit Baum <baum@bc.edu>
> 主题: st: re: missing string entry
> 收件人: statalist@hsphsun2.harvard.edu
> 日期: 2010年3月9日,周二,上午10:36
> <>
> How to convert all the missing string entry into entry
> shows "null"? 
> 
> replace myvar = "NULL" if mi(myvar)
> 
> Kit Baum   |   Boston College
> Economics & DIW
> Berlin   |   http://ideas.repec.org/e/pba1.html
>                
>               An
> Introduction to Stata Programming 
> |   http://www.stata-press.com/books/isp.html
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> 
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