Quasi-residual designs, 1-designs, and strongly regular multigraphs

A tutorial on Quasi-experimental designs

A main step in answering a scientific hypothesis in an epidemiological study is deciding which type of study is suitable to be undertaken, considering methodology, practical considerations and budget and time limitations

Half-regular symmetric designs

This paper is of an investigation of symmetric 2 (v, k,'x) designs such that the point set and the block set can each be halved to give a tactical decomposition. We assume that there is a group of automorphisms of the design of order v /2 which has two orbits of points, each of length v /2. Only the identity fixes a point, and we say that such a group acts half-regularly on the design. The desi...

Derived and residual subspace designs

A generalization of forming derived and residual designs from tdesigns to subspace designs is proposed. A q-analog of a Theorem by van Tran, van Leijenhorst and Driessen is proven, stating that if for some (not necessarily realizable) parameter set the derived and residual parameter set are realizable, the same is true for the reduced parameter set. As a result, we get the existence of several ...

4 Quasi - experimental Designs

Randomized Experiments and Quasi - Experimental Designs 5 RANDOMIZED EXPERIMENTS AND QUASI - EXPERIMENTAL DESIGNS IN EDUCATIONAL RESEARCH