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From |
Sander <avirulence@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Re: Foreach when dealing with a list of observations |

Date |
Mon, 31 Mar 2008 11:04:48 +0200 |

Thank you. Mutcode can take on many values, but because you pointed me in the right direction, I got it to work now. I am new to Stata and I tried to take the approach I would take when programming. Thanks again. Sander On Sat, Mar 29, 2008 at 7:59 PM, Michael Blasnik <michael.blasnik@verizon.net> wrote: > ... > > First, you are going about this in a very unStatalike manner -- you do not need > a loop. Second, your use of foreach is clearly not following the allowed syntax > as shown in help foreach (no -if- allowed). > > Here is a non-looping way of doing this, assuming that mutcode is either 0 or 1: > > by rin (mutcode): gen byte evermut=(mutcode[_N]==1) > drop if evermut > > which can be reduced to just 1 line if you don't want to check through to be > sure that the proper observations are flagged: > by rin (mutcode): drop if mutcode[_N]==1 > > This approach won't work if mutcode takes on missing values. In that case, you > may want to look at egen functions like max and total which could easily > identify groups that meet your criteria. > > Michael Blasnik > > ----- Original Message ----- > From: "Sander" <avirulence@gmail.com> > To: <statalist@hsphsun2.harvard.edu> > Sent: Saturday, March 29, 2008 1:00 PM > Subject: st: Foreach when dealing with a list of observations > > > > Hi, > > > > I was wondering if it's possible to go over a list of observations > > with the foreach command. What I mean is the following: I have a data > > set with persons identified by a (for the person) unique number, > > called rin. However, when personal characteristics of the people in > > the data set changed, a new record was made with the same > > identification number. Now the problem is, that if certain > > characteristics for a person have changed (which gives a mutation code > > of 1 (mutcode==1)), I want that person out of the data set. > > > > What I tried is the following. The list of identification numbers that > > I want out of the dataset can be obtained by this command: > > list rin if mutcode==1 > > > > However, I don't want to run "drop if rin==number" by hand, since > > there are many observations. Therefore, I tried the following: > > foreach x of l rin if mutcode==1 { > > drop if rin=="`x'" > > } > > > > Which doesn't work, unfortunately. I tried some other commands as well: > > foreach x of rin if mutcode==1 { > > drop if rin=="`x'" > > } > > > > and > > > > foreach x in l rin if mutcode==1 { > > drop if rin=="`x'" > > } > > > > Which also don't work. I'm probably doing something very wrong here, > > but I would really appreciate it if someone could take the time to > > help me out with this. > > > > Thanks, > > > > Sander > > * > * For searches and help try: > * http://www.stata.com/support/faqs/res/findit.html > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**st: Foreach when dealing with a list of observations***From:*Sander <avirulence@gmail.com>

**st: Re: Foreach when dealing with a list of observations***From:*"Michael Blasnik" <michael.blasnik@verizon.net>

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