منابع مشابه
Optimal Fractional Factorial Plans for Asymmetric Factorials
Fractional factorial plans for asymmetric factorial experiments are obtained. These are shown to be universally optimal within the class of all plans involving the same number of runs under a model that includes the mean, all main effects and a specified set of two-factor interactions. Finite projective geometry is used to obtain such plans for experiments wherein the number of levels of each o...
متن کاملQuasi-orthogonal Arrays and Optimal Fractional Factorial Plans
Generalizing orthogonal arrays, a new class of arrays called quasiorthogonal arrays, are introduced and it is shown that fractional factorial plans represented by these arrays are universally optimal under a wide class of models. Some methods of construction of quasi-orthogonal arrays are also described.
متن کاملOptimal Foldover Plans for Two-Level Fractional Factorial Designs
A commonly used follow-up experiment strategy involves the use of a foldover design by reversing the signs of one or more columns of the initial design. De ning a foldover plan as the collection of columns whose signs are to be reversed in the foldover design, this article answers the following question: Given a 2kp design with k factors and p generators, what is its optimal foldover plan? We ...
متن کاملAnticipating Experimental Risks Using Surveys
We introduce a survey instrument for anticipating otherwise-unforeseen risks resulting from research experiments. We present experiments hypothetically, then ask: “If someone you cared about were a candidate participant for this experiment, would you want that person to be included as a participant?” (Q1) and “Do you believe the researchers should be allowed to proceed with this experiment?” (Q...
متن کاملMethod Effects in Factorial Surveys: An Analysis of Respondents' Comments, Interviewers' Assessments, and Response Behavior
This paper describes the implementation of a factorial survey within the SOEP-Pretest of 2008 and investigates (1) respondents’ comments about the vignettes, (2) interviewers’ assessments of respondents comprehension and willingness to answer, and (3) response behavior regarding response time, use of the answering scale, and consistency of evaluations by different age groups and educational bac...
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ژورنال
عنوان ژورنال: Sociological Methods & Research
سال: 2007
ISSN: 0049-1241,1552-8294
DOI: 10.1177/0049124106292367