Dear Editor, I read with interest the comment by Lindquist and Sobel (L&S) entitled: “Graphical models, potential outcomes and causal inference” (NeuroImage, 2010) in which they advocate the use of counterfactual language to explicate causal assumptions, and raise doubts on whether graphical models are generally useful for estimating causal effects. Their comment creates the impression, perhaps...

In this paper, we introduce a package for semi-supervised learning research in the R programming language called RSSL. We cover the purpose of the package, the methods it includes and comment on their use and implementation. We then show, using several code examples, how the package can be used to replicate well-known results from the semi-supervised learning literature.

I comment on the PDDL 2.1 language and its use in the planning competition, focusing on the choices made for accommodating time and concurrency. I also discuss some methodological issues that have to do with the move toward more expressive planning languages and the balance needed in planning research between semantics and computation.

since the verbs of and have similar use and play an important role in arabic grammar, it was useful to study both and discuss about their functions. following the discussion we found that there is five different functions for :first, it is an imperfect verb, (that give the noun an nominative case and the comment an objective case) arabic grammar experts disagree if it has a verb function or a n...

We discuss our current architecture for the generation of natural language and non-verbal behavior in ICT virtual humans. We draw on our experience developing this architecture to present our current perspective on several issues related to the standardization of FML and to the SAIBA framework more generally. In particular, we discuss our current use, and non-use, of FML-inspired representation...

Note: Most SVRC technical reports are available via anonymous ftp, from ftp.cs.uq.edu.au in the directory /pub/SVRC/techreports. Abstract We give give a denotational-style speciication of a simple programming language in Z and comment on the suitability of Z for this purpose. The language speciied is based closely on one speciied by Clii Jones in VDM (Chapter 9 of Case Studies in Systematic Sof...