## Load data
data(ABdata, package = "pdynmc")
dat <- ABdata
dat[,c(4:7)] <- log(dat[,c(4:7)])
dat <- dat[c(1:140), ]
## Code example
data.info(dat, i.name = "firm", t.name = "year")
data.info(dat[dat$year %in% 1979:1981, ], i.name = "firm", t.name = "year")
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