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Subject |
Re: st: Mean calculation under consideration of different dates |

Date |
Fri, 14 Jan 2011 19:14:24 +0100 |

gen meanb= . quietly forval i=1/`=_N'{ summarize forecast if ticker==ticker[`i'] & fpedats==fpedats[`i'] & inrange(estdats[`i'] - estdats, 1, 90), meanonly replace meanb= r(mean) in `i' }

Zitat von Nick Cox <[email protected]>:

This is discussed explicitly in the Tip earlier cited with code examples. As you say, you need to add a condition of the form id == id[`i'] to the -if- condition. Here -id- is an example identifier which tells you what group you are in. Your variable name may well be different. Using more words, you are insisting that identifier == identifier of this observation or that the observations used must be in the same group. Nick On Wed, Jan 12, 2011 at 1:24 PM, <[email protected]> wrote:first many thanks to Nick for sending me the Stata Journal Tip. Nevertheless I still got some problems with telling Stata to calculate the mean for the whole dataset but apply the loop for different groups defined by two variables (company ticker and a date). Based on the tip I tried: gen meanb= . quietly forval i=1`/=_N'{ summarize forecast if inrange (estdats[`i']-estdats,1,90), meanonly replace meanb= r(mean) in `i' } How can I tell Stata to differ between certain groups? Using bysort before the loop does not work but I guess I should include some "sort-command" within the loop anyway. Maybe a tag() or id=id[`i']? Any advice is appreciated. Zitat von Nick Cox <[email protected]>:Check out SJ-7-3 pr0033 . . . . . . . . . . . . . . Stata tip 51: Events in intervals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . N. J. Cox Q3/07 SJ 7(3):440--443 (no commands) tip for counting or summarizing irregularly spaced events in intervals <http://www.stata-journal.com/sjpdf.html?articlenum=pr0033> On Thu, Jan 6, 2011 at 6:43 PM, <[email protected]> wrote:I've got a large dataset that includes forecasts of growth rates for different periods reported by different analysts at different dates. I already sorted the data to make sure that the analysts forecasts refer to the same firm and the same date. In anext step the mean of the analysts growth rate forecasts should be calculated under the assumption that only those forecasts should be taken into account that were issued maximum 90 days prior to the forecast of a certain analyst. analyst est date forecast mean 11 15.Feb 2010 0,3 0,225 22 08.Jan 2010 0,2 0,3 33 01.Jan 2010 0,25 44 01.Nov 2009 0,35 The mean calculation for analyst 11 for example consists of the forecasts of analyst 22 and analyst 33 to be in line with the maximum 90 days assumption. In addition the analysts own forecast should not be considered when calculating the mean but I guess Stata does it automatically. Any hints or tips are warmly welcomed.* * 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/

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**References**:**st: Mean calculation under consideration of different dates***From:*[email protected]

**Re: st: Mean calculation under consideration of different dates***From:*Nick Cox <[email protected]>

**Re: st: Mean calculation under consideration of different dates***From:*[email protected]

**Re: st: Mean calculation under consideration of different dates***From:*Nick Cox <[email protected]>

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