[R] If loops?

arun smartpink111 at yahoo.com
Fri Nov 2 02:38:14 CET 2012



Hi,

You can try this also :
set.seed(132)
 dat1<-data.frame(Company=rep(LETTERS[1:4],c(3,4,5,6)),Last_year=sample(2005:2012,18,replace=TRUE))
dat2<-dat1[order(dat1$Company,dat1$Last_year),]
dat2$Last<-ave(dat2$Last_year,dat2$Company,FUN=function(x) ifelse(x>=2009,2009,x))
head(dat2)
#  Company Last_year Last
#3       A      2007 2007
#1       A      2010 2009
#2       A      2012 2009
#6       B      2007 2007
#4       B      2008 2008
#5       B      2008 2008

identical(dat2[,3],pmin(dat2[,2],2009))
#[1] TRUE


A.K.



----- Original Message -----
From: kebrab67 <selamgetachew at gmail.com>
To: r-help at r-project.org
Cc: 
Sent: Thursday, November 1, 2012 8:41 PM
Subject: [R] If loops?

I have a set of data with  205 988 observation sand 10 variables , three of
which are Legal_status, Date_of_incorporation and Last_year. I set my time
horizon from 1989 to 2009. Now I want to know when a company is dead. If
Last_year is bigger or equal to 2009 then I say that a new "variable" last
is 2009. If Last_year is smaller than 2009 then my new variable "last" is
equal to the variable "Last_year". I wanted to know how I can generate this
new variable and connect it to my original data called data.



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