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From |
"Sergiy Radyakin" <serjradyakin@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Alphabetical sort by value label |

Date |
Tue, 16 Dec 2008 19:36:32 -0500 |

Dear David, Sorry, I didn't read your code. Is this something you are trying to do? program labels_ABC syntax varname local lab_name :value label `varlist' tempvar new_order preserve uselabel `lab_name', clear sort label generate `new_order' = _n tempfile order_dictionary sort value rename value `varlist' keep `varlist' `new_order' save `"`order_dictionary'"' restore sort `varlist' merge `varlist' using `"`order_dictionary'"' drop _merge sort `new_order' end ** Demonstration sysuse auto label define raz 1 "odin raz" 2 "dva raza" 3 "tri raza" 4 "chetyre raza" 5 "pyat raz" label values rep78 raz list labels_ABC rep78 list ** EOF The program should be quite self-explanatory, but let me know if something doesn't go as supposed to. Best regards, Sergiy Radyakin On Tue, Dec 16, 2008 at 6:24 PM, David Elliott <dcelliott@gmail.com> wrote: > I have a need to sort data by the alphabetical sort order of the value > labels of a variable or have value labels appear in alphabetical order > in tabs & tables. Normally, I could -decode x,gen(y)- and -sort y- to > do so, but in this case I have a very large dataset, long value labels > and no room to add a string## variable. Besides, I don't want to do > this manually, I want to generalize the process to something like > -labvalsort x- > > I've looked in various nooks and crannies of the manual, I've > -hsearch-ed and -findit-ed without any luck. Even Nick's redoubtable > labutils couldn't help in this case. > > (1) Does anyone know if such a utility program exists? > > (2) If such a program does not exist, I will outline how I am > approaching the problem on my own. > > In order to get a list of labels into manipulatable form, there were > two basic approaches that I considered: > (A) using a -levelsof- on the value labeled variable of interest and > then looping to get the labels and sorting the resultant list > (B) using mata's -st_vlload()- function to allow processing of the > labels in a matrix > > As a mata neophyte (B) looked daunting but had a certain beauty to it > since a simple function can accomplish the work of a loop. > > I created the following -labvalsort- and much to my surprise, it worked: > > -----------begin code - watch for wrapping-------------- > program define labvalsort > version 9.0 > > *! version 1.0.0 2008.12.16 > *! Alphabetical sort by value label > *! by David C. Elliott > > *! syntax is labvalsort varname > *! creates new variable prepending "_" to varname > *! creates new value label prepending "_" to varname's vlaue label > > local vallab : val lab `1' > if "`vallab'"=="" { > error 182 > exit > } > mata: vallabsort("`1'","`vallab'") > qui recode `1' `rc_list',gen(_`1') > lab val _`1' `new_lab' > end > > mata: > void vallabsort(string scalar varname , string scalar val_lab) > { > string scalar new_lab, rc_list > string matrix lab_list, sort_lab > new_lab = "_" + val_lab > st_vlload(val_lab, values=.,text=.) > lab_list=(strofreal(values),text) > sort_lab=lab_list[.,1], sort(lab_list,2) > /* > origorder = strtoreal(sort_lab[.,1]') > neworder = strtoreal(sort_lab[.,2]') > */ > // create new value label > st_vlmodify(new_lab,strtoreal(sort_lab[.,1]),sort_lab[.,3]) > // loop to create recode list > for (i=1; i<=rows(sort_lab); i++) { > rc_list = rc_list + "(" + sort_lab[i,2] + "=" + sort_lab[i,1]+")" > } > st_local("rc_list",rc_list) > st_local("new_lab",new_lab) > } > end > ---------------------------end code---------------------------- > > One can test this with: > > -----------begin code - watch for wrapping-------------- > * testing labvalsort > sysuse nlsw88.dta > lab list indlbl > tab ind > labvalsort industry > lab list _indlbl > tab _ind > sort _ind > ---------------------------end code---------------------------- > > The -labvalsort- program creates a new variable and value label where > the new variable is numerically sorted in the new value label's > alphabetical order. (Note that error checking is rudimentary at this > point) > > (3) I'd like to get rid of the recode list loop. I believe it may be > possible to do the recode from within mata and had created two vectors > origorder and neworder (currently commented out) that I intend(ed) to > use. However, I don't currently see how that is possible and would > appreciate some suggestions on how to perform the recode from within > mata. It may be that there isn't a -st_something- function available. > > While I don't anticipate coming up against macro length limits in the > usual situation, recodes involving thousands of numbers could create > an rc_list exceeding 65536. Staying in mata would stay away from that > problem, I think. > > If there is a positive answer to (1) above, then (2) is a bit > redundant, albeit an interesting challenge. If someone would like to > help with (3) it would be appreciated. Indeed, if there is an > alternate approach to the -labvalsort- problem, I'd enjoy the > discussion. If others would find -labvalsort- of use, I'll spruce it > up a bit with user choice of newvar name for the sorted variable. > > Many thanks, > > -- > David Elliott > * > * 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/

**Follow-Ups**:**Re: st: Alphabetical sort by value label***From:*"David Elliott" <dcelliott@gmail.com>

**References**:**st: Alphabetical sort by value label***From:*"David Elliott" <dcelliott@gmail.com>

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