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From |
Nick Cox <njcoxstata@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: changing values of a string variable |

Date |
Tue, 24 Apr 2012 10:02:15 +0100 |

II agree with what I take your main point. As I said, I don't use this syntax, but it seems to be what Tashi was expecting or reaching out for. Nick On Tue, Apr 24, 2012 at 9:56 AM, Prakash Singh <prakashbhu@gmail.com> wrote: > Thanks Nick for putting my words in a neat way. > > I am not convince why use the command > replace firm1 = . if firm1 != "id_131":firm1 > when you can use > replace firm1 = . if firm1 != 1 (suppose the value correnponding to > the value lebel id_131 is 1 which one can easly get to know) > > Prakash > > On Tue, Apr 24, 2012 at 1:47 PM, Ronnie Babigumira <rb.glists@gmail.com> wrote: >> Nick, this is neat, thanks. >> >> Tashi, this is certainly closer to what you had in mind >> >> encode firms, gen(firm1) >> replace firm1 = . if firm1 != "id_131":firm1 >> >> Ronnie >> >> -- >> 010100100110111101101110011011100110100101100101 >> >> >> >> >> On Tuesday, April 24, 2012 at 9:52 AM, Nick Cox wrote: >> >>> Prakash's opening statement is incorrect. If you -encode- a string >>> variable, it loses no property and indeed stays exactly as it is. What >>> happens is that a numeric variable is created with value labels equal >>> to the string values. >>> >>> Tashi appears to be seeking something like the last line here >>> >>> sysuse auto >>> label def rep78 1 appalling 2 adequate 3 average 4 amazing 5 astounding >>> label val rep78 >>> >>> . count if rep78=="average":rep78 >>> 30 >>> >>> For more, see in [U] and e.g. >>> >>> SJ-4-4 dm0009 . . . . . . . Stata tip 14: Using value labels in expressions >>> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . K. Higbee >>> Q4/04 SJ 4(4):488--489 (no commands) >>> tips for using value labels in expressions >>> >>> Ken Higbee's paper is accessible at >>> >>> http://www.stata-journal.com/sjpdf.html?articlenum=dm0009 >>> >>> This syntax has been in Stata a very long time. I don't use it, partly >>> because I keep forgetting about it and partly because I would need to >>> look it up to remember what it is, and my wild guess is that many >>> experienced users would say something similar. >>> >>> Nick >>> >>> >>> Prakash Singh [edited slightly] >>> >>> > when you -encode- any variable it loses its string property so >>> > there would be numeric value corresponding to id_131 in firms1 and you >>> > should use that value in your command line >>> >>> >>> >>> tashi lama >>> >>> > > I found matters similar to what I am going to post have been been discussed in the past but I am not sure if I understood. Here is my dataset >>> > > >>> > > hits firms >>> > > 3 id_6429 >>> > > 10 id_131 >>> > > 8 id_2837 >>> > > >>> > > 12 id_90 >>> >>> > > The problem is to have sth like this >>> > > >>> > > hits firms >>> > > >>> > > 3 . >>> > > >>> > > 10 id_131 >>> > > 8 . >>> > > >>> > > 12 . >>> > > >>> > > >>> > > so I said 1. encode firm, gen(firm1) >>> > > >>> > > replace firm1=. if firm1!=id_131 >>> > > >>> > > drop firms >>> > > >>> > > I also tried 2. replace firms="" if firms!="id_131" >>> >>> > > It didn't give me the expected output although I feel like my codes are correct at least in principle. Any idea? * * 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/

**References**:**st: changing values of a string variable***From:*tashi lama <ltashi32@hotmail.com>

**Re: st: changing values of a string variable***From:*Prakash Singh <prakashbhu@gmail.com>

**Re: st: changing values of a string variable***From:*Nick Cox <njcoxstata@gmail.com>

**Re: st: changing values of a string variable***From:*Ronnie Babigumira <rb.glists@gmail.com>

**Re: st: changing values of a string variable***From:*Prakash Singh <prakashbhu@gmail.com>

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