statistics - Keep completeness of record when subsetting time series datasets in R -


i'll explain problem better. have downloaded databasee 300,000 observations time span of 16 years. want subset database taking in account completeness.

  • i want keep observations complete in terms of year.

example: assuming 3 different items (a,b , c) , time frame of 5 years.

for item have observation years 1 5; item b have observations years 1,2,4,5; item c have year 3.

i want subset dataset new dataset contain item a.

how can translate in code?

in simple way, having not seen data, 

name <- c('a', 'a', 'a', 'a', 'a', 'b', 'b', 'b', 'b', 'c') year <- c(1, 2, 3, 4, 5, 1, 2, 4, 5, 3) data <- data.frame(name, year)  tmp <- aggregate(year ~ name, data, length) tmp1 <- subset(tmp, year >=5)

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