Re: st: RE: RE: RE: RE: Combining multiple observations by an ID variable

[Claude Beaty <cbeaty1@jhmi.edu>]

Thank you. I will try it. 

Claude Beaty
Sent from my iPhone

On Jun 12, 2012, at 7:02 PM, "Steve Nakoneshny" <scnakone@ucalgary.ca> wrote:

> Claude,
> 
> It does appear that -reshape- is the way to go here. Without a snippet example of your dataset (or using an example dataset, if preferred) or without the errant code you are trying to execute, people won't be able to provide you particularly valuable feedback.
> 
> With that out of the way, I will hazard a guess that you haven't appropriately specified your variables in the reshape command. I might try something in the form like (untested):
> 
> bysort patientID: gen visitID=_n
> order patientID visitID
> reshape wide a-z, i(patientID) j(visitID)    // a-z assumes that the common stub vars to be reshaped are in a consecutive order
> 
> 
> As Quinn suggests, you may run out of variables depending on which version of Stata you are using. This too will result in an error code being returned. If this is the case, you may have to either drop variables or play around with -collapse- to make it work, I don't know.
> 
> 
> Steve
> 
> On 2012-06-12, at 4:31 PM, Claude Beaty wrote:
> 
>> Mr. Swanquist,
>> 
>> Reshape was something I considered as well. Unfortunately, every time I attempt to run this code I get the error "too many macros". I have stata 12, which I believe is the most updated version. If anyone knows of a way around this, please let me know.
>> 
>> Claude A. Beaty Jr., M.D.
>> Halsted Surgical Resident
>> Cardiac Surgery Research Fellow
>> The Johns Hopkins Hospital
>> 
>> 
>> -----Original Message-----
>> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Swanquist, Quinn Thomas
>> Sent: Tuesday, June 12, 2012 5:38 PM
>> To: statalist@hsphsun2.harvard.edu
>> Subject: st: RE: RE: RE: Combining multiple observations by an ID variable
>> 
>> Fair enough, 
>> 
>> If you need the observations to equal the number of visits and you need to keep the data from each visit, you are going to need to use the reshape wide function on the master dataset before the merge. Since you said that you have 70 variables for each visit, you will now have 70 * the max number of visits variables. Depending on your version of Stata you may or may not be able to work with that many variables.
>> 
>> You can get help with this function using:
>> 
>> help reshape
>> 
>> Quinn Swanquist
>> qswanqui@utk.edu
>> 
>> 
>> 
>> 
>> -----Original Message-----
>> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Claude Beaty
>> Sent: Tuesday, June 12, 2012 5:31 PM
>> To: statalist@hsphsun2.harvard.edu
>> Subject: st: RE: RE: Combining multiple observations by an ID variable
>> 
>> Mr. Swanquist,
>> 
>> It looks like the merger attempt was likely successful, though I'm sure there are some duplicates. However, your suggested code did not help to shift the data so that the total observations equal the number of ID codes instead of the number of visits. I have tried reshaping etc, but there are too many macros to reshape all of the variables. Is there another way? If I can arrange the data in this way, it is easier to compare with my previous file and find duplicate ID codes. As it stands now, it is difficult to tell if duplicate ID codes are due to successive visits or duplications created by the file merger. Thanks
>> 
>> Claude A. Beaty Jr., M.D.
>> Halsted Surgical Resident
>> Cardiac Surgery Research Fellow
>> The Johns Hopkins Hospital
>> 
>> 
>> -----Original Message-----
>> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Swanquist, Quinn Thomas
>> Sent: Tuesday, June 12, 2012 5:16 PM
>> To: statalist@hsphsun2.harvard.edu
>> Subject: st: RE: Combining multiple observations by an ID variable
>> 
>> Do you have an identifier for visit number (if not you could use date).
>> 
>> Sort as follows:
>> 
>> sort IDcode visit
>> 
>> then merge many to one as follows:
>> 
>> merge m:1 IDcode using "usingfile"
>> 
>> 
>> 
>> Quinn Swanquist
>> qswanqui@utk.edu
>> 
>> 
>> 
>> 
>> -----Original Message-----
>> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Claude Beaty
>> Sent: Tuesday, June 12, 2012 5:02 PM
>> To: statalist@hsphsun2.harvard.edu
>> Subject: st: Combining multiple observations by an ID variable
>> 
>> All,
>> 
>> I have a large dataset of observations in which individuals (~40,000 ID codes) were evaluated multiple times (5-10 visit numbers per individual) on over 70 variables. However, the data has been arranged so that each visit number is an observation, instead of each individual ID code as an observation. I need to merge this file with another file sorted by individual ID codes. How do I rearrange this data so that it is arranged by ID codes with consecutive follow up visits? Thanks
>> 
>> Claude A. Beaty Jr., M.D.
>> Halsted Surgical Resident
>> Cardiac Surgery Research Fellow
>> The Johns Hopkins Hospital
>> 
>> 
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