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From |
"Eva Poen" <eva.poen@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: -merge- (?) problem (was: st: MIME-Version: 1.0) |

Date |
Tue, 30 Sep 2008 10:08:51 +0100 |

As Martin said, there are tools out there to do this. However, if you are generally interested in parallel lists: There is an faq on how to process parallel lists: http://www.stata.com/support/faqs/lang/parallel.html Also, Nick Cox wrote a Stata Tip on lists, which is available free of charge thanks to the moving wall policy by StataCorp: http://www.stata-journal.com/article.html?article=pr0009 Eva 2008/9/30 Ashim Kapoor <ashimkapoor@gmail.com>: > Hello. > > Thank you for your reply. I wish to ask another ( related ) question. > > Suppose I have 2 local variables with the SAME no of "words". > > local name="One Two Three Four" > local numname="one two three four" > > I want to do something like :- > > rename One one > rename Two two > rename Three three > rename Four four. > > So I have 2 questions. How do I get the number of words in the local > macro. And 2nd How do I access the 1/2/3/4 "word" of the macro. I have > seen the word command for STRING variables, but can I do this for a > local variable ? > > Thank you, > Ashim. > > > On Mon, Sep 29, 2008 at 9:03 PM, Eva Poen <eva.poen@gmail.com> wrote: >> Ashim, >> >> Please try and use Stata lingo in your postings: observations (not >> rows, or items) and variables (not columns). >> >> You can do it much easier. -help merge- will provide some good information. >> >> *** >> use secondfile >> sort symbol year >> save, replace >> >> use firstfile >> sort symbol >> merge symbol using secondfile, uniqmaster >> save mergefile >> *** >> >> Now you will have ticker as a variable in you second file. Inspect the >> _merge variable (see -help merge-) to make sure the outcome is what >> you expected. >> >> Next: >> *** >> qui levelsof symbol, local(loop) >> foreach x of local loop { >> drop _all >> use mergefile >> keep if symbol == "`x'" >> save `=ticker[1]' >> } >> *** >> >> HTH, >> Eva >> >> 2008/9/29 Ashim Kapoor <ashimkapoor@gmail.com>: >>> Hello Eva, >>> >>> Thank you for your time. Let me be more clear this time. >>> >>> In the first file I have 2 variables--> symbol and ticker. The tickers >>> are file names I want to save various output files as. There is a one >>> one correspondence between symbol and tickers. For example. >>> >>> symbol ticker >>> 1. ABB abb >>> 2. BHARTI bti >>> 3. AIRTEL artl >>> >>> >>> That is what the first file looks like. >>> >>> the second file has variables year / symbol / production / etc. >>> >>> It looks like >>> >>> symbol year production >>> 1. ABB 1998 92 >>> 2. ABB 1999 95 >>> 3. BHARTI 1998 61 >>> 4. BHARTI 1999 70 >>> 5. AIRTEL 2000 80 >>> 6. AIRTEL 2001 81 >>> >>> Now I want to save items 1 and 2. ie. items with symbol = ABB in a >>> file named "abb.dta" >>> I want to saves items 3 & 4 ie. items with symbol= BHARTI in a file >>> named "bti.dta" >>> and items with symbol = "AIRTEL" in a file named "artl.dta". >>> >>> So I guess this would be a 2 step procedure. >>> >>> Step 1 : store all symbols in ONE local macro and store all tickers in >>> the 2nd local macro. >>> >>> Step 2 : Loop through the 2 equal sized loops, do a keep if symbol == >>> ...... and save as the corresponding ticker . >>> >>> Can u tell me how to do this in stata ? >>> >>> Thank you, >>> Ashim. >>> >>> On Mon, Sep 29, 2008 at 4:38 PM, Eva Poen <eva.poen@gmail.com> wrote: >>>> Ashim, >>>> >>>> I'm sorry but I don't get it. You have two variables in your first >>>> file, called symbol and ticker. What are they? Numeric, string? In >>>> your second file you have symbol again (what about ticker?), and many >>>> more variables, and you also have more observations (symbol does no >>>> longer uniquely identify observations). >>>> >>>> Now you want to do some operation that looks suspciously like a >>>> -merge-, but it's unclear to me. For each symbol from file 1, you want >>>> to -use- file 2 and -keep- all observations with this symbol. >>>> Following what you said earlier, you will now be left with approx. 100 >>>> observations and many variables. Now you say you want to save this "as >>>> ticker in the 1st file". What do you mean by that? You want to save >>>> all 100 observations and many variables, in the first file? And what's >>>> that to do with ticker? Ticker already exists in the first file. Do >>>> you want to replace it, and with what information? Or do you want to >>>> add ticker to the second file? >>>> >>>> You'll have to be more precise for someone to be able to help. >>>> >>>> Eva >>>> >>>> 2008/9/29 Ashim Kapoor <ashimkapoor@gmail.com>: >>>>> Hello everyone, >>>>> >>>>> I have 2 files. >>>>> >>>>> The 1st file has 2 columns --> symbol and ticker. [ each symbol is >>>>> only in one observation ] >>>>> >>>>> The 2nd file has many more columns --> symbol and many other vars. [ >>>>> each symbol is in around 100 observations here ] >>>>> >>>>> I want to say foreach symbol in 1st file { >>>>> >>>>> use 2nd file >>>>> >>>>> keep if symbol ==above symbol >>>>> >>>>> save as ticker in the 1st file >>>>> >>>>> } >>>>> >>>>> >>>>> Can someone tell me how to do this ? >>>>> >>>>> I guess to start with I would have to save the entire observations in >>>>> symbol var in 1st file in ONE local macro and similarly for the >>>>> ticker. Can someone tell me how to do this ? >>>>> >>>>> Thank you, >>>>> >>>>> Ashim. >>>> * >>>> * 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/ >>> >> * >> * 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/ > * * 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: -merge- (?) problem (was: st: MIME-Version: 1.0)***From:*"Ashim Kapoor" <ashimkapoor@gmail.com>

**References**:**-merge- (?) problem (was: st: MIME-Version: 1.0)***From:*"Eva Poen" <eva.poen@gmail.com>

**Re: -merge- (?) problem (was: st: MIME-Version: 1.0)***From:*"Ashim Kapoor" <ashimkapoor@gmail.com>

**Re: -merge- (?) problem (was: st: MIME-Version: 1.0)***From:*"Eva Poen" <eva.poen@gmail.com>

**Re: -merge- (?) problem (was: st: MIME-Version: 1.0)***From:*"Ashim Kapoor" <ashimkapoor@gmail.com>

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