.dta), SPSS (.sav or .por), and GraphML (.xml) formatted data files as subsettable. When a file is subsettable, you can analyze it online or download a subset (selection) of the variables in the file. For tabular data, you then can recode variables and apply descriptive statistics or use any of the models provided by the Zelig statistical package. For network data, you can subset or use any of the network analysis models supported by the igraph library.