MAS314 Design of Experiments 15 May 2006, 14:30–16:30 Rubric: This paper has two Sections and you should attempt both Sections. Please read carefully the instructions given at the beginning of each Section. Calculators may be used. Cambridge Elementary Statistical Tables are provided. Section A: Each question carries 25 marks. You should attempt BOTH questions. Section B: Each question carries ...

A defining set of a t-(v, k, λ) design is a partial design which is contained in a unique t-design with the given parameters. A minimal defining set is a defining set, none of whose proper partial designs is a defining set. This paper proposes a new and more efficient algorithm that finds all non-isomorphic minimal defining sets of a given t-design. The complete list of minimal defining sets of...

A sender chooses ex ante how her information will be disclosed ex post. A receiver obtains public information and information disclosed by the sender. Then he takes one of two actions. The sender wishes to maximize the probability that the receiver takes the desired action. I show that the sender optimally discloses only whether the receiver’s utility is above a cuto¤, which makes the receiver ...

The effects of four different identity revelation modes (three fixed modes: real name, anonymity, nickname and one dynamic user self-choice mode) on participants’ perceptions toward their assessors, classroom climate, and past experience with the learning activity in which they were engaged were examined. A pretest-posttest quasi-experimental research design was adopted. Eight fifth-grade class...

iii To God Almighty iv ACKNOWLEDGEMENTS I would like to thank my research advisor, Dr. Lee W. Lerner, for providing me with the opportunity, resources, and guidance which made this work possible. I am also very grateful for Dr. Michael E. West for providing me with the opportunity to work at the Georgia Tech Research Institute. In addition, I would like to thank my Virginia Tech colleagues who ...

This article addresses the varied possibilities for following a two-level fractional factorial with another fractional factorial half the size of the original experiment. While follow-up fractions of the same size as an original experiment are common practice, in many situations a smaller follow-up experiment will suffice. Peter John coined the term “semifolding” to describe using half of a fol...