collapsing datasets from a list

[andkov]

@casslbrown

This is a reproducible example for combining a list of datasets into a single data frame.

year1 <- data.frame(
  id   = c(1,2),
  var1 = c(11,12),
  var2 = c(22,23 )
)

year2 <- data.frame(
  id = c(1,2),
  var1 = c(33,34),
  var2 = c(44,45),
  var3 = c(55,56)
  
)

dto <- list(
  `1` = year1, 
  `2` = year2)

ds <- plyr::ldply(dto,data.frame, .id = "year")
> ds %>% dplyr::arrange(id)
  year id var1 var2 var3
1    1  1   11   22   NA
2    2  1   33   44   55
3    1  2   12   23   NA
4    2  2   34   45   56