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From |
Eric Booth <ebooth@ppri.tamu.edu> |

To |
"<statalist@hsphsun2.harvard.edu>" <statalist@hsphsun2.harvard.edu> |

Subject |
Re: st: How to list all the observation meeting the conditions which are the former results? |

Date |
Sun, 12 Dec 2010 22:25:45 +0000 |

<> You could build your -if- conditions in a macro, see the example below: **********************! //1. dataset_target// /* you will apply the conditions in which z<=5 in the "dataset_source" to this dataset later on */ clear set obs 5000 foreach a in x y z { g `a' = int(abs(runiform()*50)) } sa "dataset_target.dta", replace //2. dataset_source// /* this is the dataset where you get the values of x & y where z<=5 */ clear set obs 50 foreach a in x y z { g `a' = int(abs(runiform()*50)) } l if z<=5 //3. put x&y pairs where z<=5 in global macro // global myif forval n = 1/`=_N' { if `=z[`n']'<=5 { global myif | (x==`=x[`n']' & y==`=y[`n']') $myif di in r "$myif" } } global myif:subinstr global myif "|" "" global myif if $myif *--Here are the conditions where z<=5--* di in y "$myif" *--list these obs. in source dataset--* li z $myif //4. use conditions in global $myif on target dataset(s)// u "dataset_target.dta", clear li z $myif **********************! - Eric __ Eric A. Booth Public Policy Research Institute Texas A&M University ebooth@ppri.tamu.edu Office: +979.845.6754 Fax: +979.845.0249 http://ppri.tamu.edu On Dec 12, 2010, at 8:38 AM, Grace Jessie wrote: > Thank you for reply. > It seems the problem has not been solved. > I do not want to list all the observations meeting "z<5". > Firstly, I get the combination of x and y appearing in the results of "z<5". Then I want to list all the observations with the combination of x and y, maybe in the current data or in another data. > In my firt posting, > "I know -levelsof- can solve the problem if not the combination but just one variable." > For example, > levelsof x if z<5,loc(a) > foreach i of loc a { > l if x==`i' > } > Now I doubt if not a variable but a combination (such as two variables), > how to do it? > Grace > > > ---------------------------------------- >> From: eric.de_souza@coleurope.eu >> To: statalist@hsphsun2.harvard.edu >> Date: Sun, 12 Dec 2010 15:13:40 +0100 >> Subject: RE: st: How to list all the observation meeting the conditions which are the former results? >> >> input x y z >> .... >> gen id = _n >> l >> preserve >> keep if z<5 >> l >> restore >> >> This way you have the observation numbers in the original dataset >> >> Or do you want something else? >> >> Eric de Souza >> College of Europe >> BE-8000 Brugge (Bruges) >> Belgium >> >> -----Original Message----- >> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Grace Jessie >> Sent: 12 December 2010 13:46 >> To: statalist@hsphsun2.harvard.edu >> Subject: st: How to list all the observation meeting the conditions which are the former results? >> >> Dear statalists, >> How to list all the observation meeting the conditions which are the former results? >> For example, >> . clear >> . input x y z >> x y z >> 1. 1 2 8 >> 2. 1 2 2 >> 3. 2 3 4 >> 4. 2 3 9 >> 5. 2 4 8 >> 6. end >> . l >> +-----------+ >> | x y z | >> |-----------| >> 1. | 1 2 8 | >> 2. | 1 2 2 | >> 3. | 2 3 4 | >> 4. | 2 3 9 | >> 5. | 2 4 8 | >> +-----------+ >> . l if z<5 >> +-----------+ >> | x y z | >> |-----------| >> 2. | 1 2 2 | >> 3. | 2 3 4 | >> +-----------+ >> Now I want to list all the observations for each x and y combination in the former results,i.e.,(x==1 & y==2) | (x==2 | y==3). >> I know I can type "l if (x==1 & y==2) | (x==2 | y==3)". >> However, typing one by one is troublesome if the number of the combinations for the former results is large. >> I know -levelsof- can solve the problem if not the combination but just one variable. >> Is there a way like -levelsof- ? >> Thank you! >> Grace >> * * 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: How to list all the observation meeting the conditions which are the former results?***From:*"Keith Dear" <Keith.Dear@anu.edu.au>

**References**:**st: How to list all the observation meeting the conditions which are the former results?***From:*Grace Jessie <gracejessie@hotmail.com>

**RE: st: How to list all the observation meeting the conditions which are the former results?***From:*DE SOUZA Eric <eric.de_souza@coleurope.eu>

**RE: st: How to list all the observation meeting the conditions which are the former results?***From:*Grace Jessie <gracejessie@hotmail.com>

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