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POHow to put information obtained by cast function of reshape package back in my original data frame in R
 

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  1. POHow to put information obtained by cast function of reshape package back in my original data frame in R
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    <p>I have a data.frame in panel format (country-year) and I need to calculate the mean of a variable by country and at each five years. So I just used the 'cast' function from 'reshape' package and it worked. Now I need to put this information(the mean by quinquennium) in the old data.frame, so I can run some regressions. How can I do that? Below I provide an example to ilustrate what I want:</p> <pre><code>set.seed(2) fake= data.frame(y=rnorm(20), x=rnorm(20), country=rep(letters[1:2], each=10), year=rep(1:10,2), quinquenio= rep(rep(1:2, each=5),2)) fake.m = melt.data.frame(fake, id.vars=c("country", "year", "quinquenio")) cast(fake.m, country ~ quinquenio, mean, subset=variable=="x", na.rm=T) </code></pre> <p>Now, everything is fine and I get what I wantted: the mean of x and y, by country and by quinquennial years. Now, I would like to put them back in the data.frame fake, like this:</p> <pre><code> y x country year quinquenio mean.x 1 -0.89691455 2.090819205 a 1 1 0.8880242 2 0.18484918 -1.199925820 a 2 1 0.8880242 3 1.58784533 1.589638200 a 3 1 0.8880242 4 -1.13037567 1.954651642 a 4 1 0.8880242 5 -0.08025176 0.004937777 a 5 1 0.8880242 6 0.13242028 -2.451706388 a 6 2 -0.2978375 7 0.70795473 0.477237303 a 7 2 -0.2978375 8 -0.23969802 -0.596558169 a 8 2 -0.2978375 9 1.98447394 0.792203270 a 9 2 -0.2978375 10 -0.13878701 0.289636710 a 10 2 -0.2978375 11 0.41765075 0.738938604 b 1 1 0.2146461 12 0.98175278 0.318960401 b 2 1 0.2146461 13 -0.39269536 1.076164354 b 3 1 0.2146461 14 -1.03966898 -0.284157720 b 4 1 0.2146461 15 1.78222896 -0.776675274 b 5 1 0.2146461 16 -2.31106908 -0.595660499 b 6 2 -0.8059598 17 0.87860458 -1.725979779 b 7 2 -0.8059598 18 0.03580672 -0.902584480 b 8 2 -0.8059598 19 1.01282869 -0.559061915 b 9 2 -0.8059598 20 0.43226515 -0.246512567 b 10 2 -0.8059598 </code></pre> <p>I appreciate any tip in the right direction. Thanks in advance.</p> <p>ps.: the reason I need this is that I'll run a regression with quinquennial data, and for some variables (like per capita income) I have information for all years, so I decided to average them by 5 years.</p>
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