Bookmark and Share

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


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

Re: st: RE: cleaning data efficiently


From   Maria Ana Vitorino <[email protected]>
To   <[email protected]>
Subject   Re: st: RE: cleaning data efficiently
Date   Fri, 28 Oct 2011 12:02:58 -0400

Thanks for the quick response.
This is very helpful.
Ana


On Oct 28, 2011, at 11:24 AM, Nick Cox wrote:

1. -egen- has a -mode()- function.

egen mode = mode(regionname), by(regioncode)

2.

For that you need something like

egen tag = tag(mode regioncode)
egen ndistinctvalues = total(tag), by(mode)

See also for a review

SJ-8-4 dm0042 . . . . . . . . . . . . Speaking Stata: Distinct observations (help distinct if installed) . . . . . . N. J. Cox and G. M. Longton
       Q4/08   SJ 8(4):557--568
       shows how to answer questions about distinct observations
       from first principles; provides a convenience command

3.

ssc inst groups
help groups
groups regionname regioncode

(there are other ways, but I like this one)

Nick
[email protected]

Vitorino, Maria Ana

Suppose I have the following data:

regioncode  regionname
X  AAA
Y BBB
Z CCC
X   .
X AAA
Y BBB
Z   .
Z AAA
Z CCC
Z CCC

Assume also that the regioncode variable is correct but there are some errors and missing values in the regionname variable. 1) Is there an efficient way to fix the entries in the regionname variable? (For this we need to assume that the correspondence between regioncode and regioname that occurs more frequently is the correct one.)

I usually deal with this type of issues using several lines of code so I'm wondering if there is a more efficient way making use of some stata commands that I'm not familiar with.

Also, if, after correcting the mistakes, I want to
2)check if the correspondence between the two variables is unique
3) create a table with regionname regioncode and frequency of observations (but not a two-way table)
What is the most efficient way?

*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/

*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/


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