Quantum is a software package and programming language for statistical survey data validation and manipulation and tabulation. Originally developed by Quantime to run on Unix systems, it was incorporated into SPSS Inc.'s SPSS MR product line  after its acquisition of Quantime on September 1997.
- CCOUNT is a freeware (restrictive license) alternative to Quantum. MRDCL is another alternative which is seen as a modern alternative to Quantum (www.mrdcsoftware.com/products/mrdcl)
- SPSS public statement referencing Quantime acquisition
- Business Wire article on SPSS Inc.'s acquisition of Quantime