a list of data frames with a shared set of variables.
Value
A data frame with the shared set of variables. In addition, it also contains factors identifying the original file (Origin), and a single consecutive numbering of all groups from different data frames (Series).
...the shared set of variables from the the data frames in the list.
Groupa factor that is the original Group variable as defined by OnTarget PC/TDS.
Origina factor that codes from which original file the data is.
orgSera factor that results from droplevels(interaction(Origin, Group)), and codes each separate group across original files. The order of the factor levels is alphabetical.
Seriesa factor that codes each separate group as defined by orgSer, but more conveniently as a number that runs consecutively across original files.
Details
Assumes that the data frames in the list have a non-empty set of shared variables. Among these variables, there must be a factor Group. To be useful for functions analyzeGroup or compareGroups, the data frames also need variables Distance, Aim.X, Aim.Y defining point of aim, Point.X, and Point.Y defining the bullet holes.