New solution for sequential analysis

17 October 2008

A great connection has been made between The Observer and GSEQ for Windows. GSEQ (General Sequential Querier) is a really nice addition to the analysis you can do with The Observer. With GSEQ you don’t need complex statistical software to get a bit more information out of your observational data.

GSEQ for Windows, developed by Roger Bakeman and Vicenc Quera, is a program devised for sequential analysis. It reads compiled SDIS files and provides a variety of sequential statistics, including tables of lag frequencies, chi-squares, and adjusted residuals. Several kinds of data modifications are permitted, including recording, lumping, chaining, time-windowing, and removing of behavioral codes. GSEQ can export results for further analyses using SPSS, BMDP, ILOG, etc.

Users interact with GSEQ by a specific language. By using ObsTxtSds, a converter program, you can easily convert observational data from The Observer into this specific language: SDIS language. SDIS is a language for describing sequential data as obtained thru observations.


  1. Bakeman, R.; Quera, V. (1995). Analyzing Interaction: Sequential Analysis with SDIS and GSEQ. New York: Cambridge University Press.
  2. Quera, V.; Bakeman, R. (1998). SDIS-GSEQ 2.0: Software for the analysis of behavior sequences. Measuring Behavior '98, 2nd International Conference on Methods and Techniques in Behavioral Research (Groningen, The Netherlands, 18-21 August 1998), 238-239.
  3. Bakeman, R.; Quera, V. (2000). OTS: a program for converting Noldus Observer data files to SDIS files. Behavior Research Methods, Instruments & Computers, 32, 207-212.
  4. Quera, V.; Bakeman, R. (2000). GSEQ for Windows: new software for the sequential analysis of behavioral data, with an interface to The Observer. Proceedings of Measuring Behavior 2000, 3rd International Conference on Methods and Techniques in Behavioral Research (Nijmegen, 15-18 August 2000), 257-258.
  5. Bakeman, R.; Quera, V.;Gnisc, A. (2008).  Observer agreement for timed-event sequential data: Time-based and event-based algorithms compared. Proceedings of Measuring Behavior 2008, 6th International Conference on Methods and Techniques in Behavioral Research (Maastricht, 26-29 August 2008), 195-196.
  6. Bakeman, R., & Quera, V. (2008).  ActSds and OdfSds:  Programs for Converting INTERACT and The Observer Data Files into SDIS Timed-Event Sequential Data Files (2008).  Behavior Research Methods, 40, 869–872.