title: Fractional Design Wizard: a computer program for cost-effective experimental research design.
abstract: The computer program Fractional Design Wizard creates fractional factorial designs that are cost-effective and especially useful for discarding irrelevant factors from a large number of possible candidates. The program is intended for researchers who are relatively new to the field of fractional design and who want to acquaint themselves with the use of fractions for the reduction of large experimental designs. Fractional designs allow estimation of main effects, and sometimes two-way interactions, without one's having to examine all treatment conditions. The program needs Microsoft Windows 95 or better and 32 MB of memory. In a step-by-step fashion, the user can specify the required properties of the fractional design. When there are more valid designs, the user can generate these successively. If necessary, the user can go back to diminish the requirements. The output can be copied, printed, and saved. The program generates all the information that is needed for the use and interpretation of fractional designs. A help file explains the use of the program and also the purpose, the analysis, and the interpretation of fractional designs. The program, which is written in Object Pascal, is available as freeware on www.fss.uu.nl/ms/hl/fracdes.htm.
authors.affiliation: Utrecht University, Faculty of Social Sciences, Department of Methodology and Statistics, P.O. Box 80140, NL 3508TC Utrecht, The Netherlands. j.a.landsheer@fss.uu.nl
authors.forename: Johannes A
authors.initials: JA
authors.lastname: Landsheer
authors.forename: Godried
authors.initials: G
authors.lastname: van den Wittenboer
mesh_terms: D000465:Algorithms; D000704:Analysis of Variance; D003362:Cost-Benefit Analysis / Q000191:economics* / Q000706:statistics & numerical data*; D011589:Psychology, Experimental / Q000191:economics*; D012107:Research Design / Q000706:statistics & numerical data*; D012984:Software