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2011 Sep 05
1
In optim() function, second parameter in par() missing
Hi,
First time using the optim(), can someone please tell me what I am doing
wrong? The error looks like this
Error in .Internal(pnorm(q, mean, sd, lower.tail, log.p)) :
'sd' is missing
An example of the error
dat = c(20, 19, 9, 8, 7, 4, 3, 2)
dat_mu=mean(dat)
dat_s=sd(dat)
max.func = function(dat, mu, sd) {
pnorm(dat, mu, sd)
}
optim(fn=max.func, dat=dat, par=c(mu=dat_mu, s=dat_s))
I get sd is missing error. If I wrote par=c(s=dat_s, mu=dat_mu) , then it
tells me mu is missing. Can someone please help?
Thanks!
Colin
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2011 May 19
2
balanced panel data
I have a dataframe with many firm-year observations and many variables.
Not all firms have information for all the years.
I want another dataframe with only those firms that have information all
years.
This is, I want a balanced panel data, but with the maximum number of years.
In my reprocucible example I want to keep firms 1,2 and 3 (period 2000 to
2004).
I need your help to create a