Hi Faradj,
Rui's advice is correct, here's a way to do it. Note that I have
replaced the comma decimal points with full stops for my convenience:
fkdf<-read.csv(text="Year,Country,X1,X2
1990,United States,0,0.22
1991,United States,0,0.22
1992,United States,0,0.22
1993,United States,0,0.22
1994,United States,0,0.22
1995,United States,0,0.22
1996,United States,0,0.22
1997,United States,0,0.5
1998,United States,0,0.5
1999,United States,0,0.5
2000,United States,0,0.5
2001,United States,0,0.5
2002,United States,2,NA
2003,United States,2,0.5
2004,United States,2,1
2005,United States,1,1
2006,United States,1,1
2007,United States,1,1
2008,United States,1,1
2009,United States,1,1
2010,United States,1,0.5
2011,United States,0,0.5
1990,Canada,1,1.5
1991,Canada,1,1.5
1992,Canada,1,NA
1993,Canada,1,1.5
1994,Canada,1,1.5
1995,Canada,1,1.5
1996,Canada,1,1.5
1997,Canada,1,1.5
1998,Canada,1,2
1999,Canada,2,2
2000,Canada,2,2
2001,Canada,2,2
2002,Canada,2,2
2003,Canada,1,2
2004,Canada,2,0.5
2005,Canada,1,0.5
2006,Canada,0,0.5
2007,Canada,1,0.5
2008,Canada,0,0.5
2009,Canada,1,0.5
2010,Canada,1,0.5
2011,Canada,0,1",
header=TRUE,stringsAsFactors=FALSE)
diffX1<-aggregate(fkdf$X1,by=list(fkdf[,2]),FUN=diff)
diffX2<-aggregate(fkdf$X2,by=list(fkdf[,2]),FUN=diff)
diffX1<-data.frame(diffX1$Group.1,diffX1$x)
diffyears<-unique(fkdf$Year)[-1]
names(diffX1)<-c("Country",diffyears)
diffX2<-data.frame(diffX2$Group.1,diffX2$x)
names(diffX2)<-c("Country",diffyears)
Jim
On Sun, Jul 21, 2019 at 5:34 AM Faradj Koliev <farad...@gmail.com> wrote:
Dear R-users,
I have a country-year data for 180 countries from 1970 to 2010. I’m interested
in capturing positive and negative changes in some of the variables. Some of
these variables are continuous (0,25, 0,33, 1, 1,5 etc) others are ordered
(0,1, 2).
To do this, I use this code data$X1_change<- +c(FALSE,diff(data$X1))
My data looks something like this (please see below).
There’re some problems with this code: (1) I can’t capture the smaller
changes, say from 0,25 to 0,33 ( I get weird numbers). I would love to get the
exact difference ( for ex: +1, -0,22, +4, -2 etc). (2) It can’t make
difference between countries. That is, it takes the difference between
countries while it should only do this for each country ( for ex: when the US
ends in 2011, and Canada starts, it counts this a difference but it shouldn’t,
see below). (3) NAs, missing values, is neither a positive or negative change,
although it does think that what comes after the NA is a difference.
So, I wonder if anyone here can help me to adjust this code. I appreciate all
comments.
