Critique notes 84

PTH(1-84)/PTH(7-84): a balance of power.

This review considers many new basic and clinical aspects of parathyroid hormone (PTH). We focus especially on the identification of PTH fragments and how they may relate to renal failure, diagnosis, and treatment of secondary hyperparathyroidism and renal osteodystrophy. The biosynthesis and metabolism of PTH, measurement of circulating forms of PTH, the effects of PTH on receptor activation a...

The Concept of Laws in Social Science: A Critique and Notes on an Expanded View

Agnostic Notes on Regression Adjustments to Experimental Data: Reexamining Freedman’s Critique By

Freedman [Adv. in Appl. Math. 40 (2008) 180–193; Ann. Appl. Stat. 2 (2008) 176–196] critiqued ordinary least squares regression adjustment of estimated treatment effects in randomized experiments, using Neyman’s model for randomization inference. Contrary to conventional wisdom, he argued that adjustment can lead to worsened asymptotic precision, invalid measures of precision, and small-sample ...

The Creature Before the Law: Notes on Walter Benjamin’s Critique of Violence

Transforming as it does from an exemplar of meticulous philosophical analysis into an allusive political/messianic tract, Walter Benjamin’s “Critique of Violence” is representative of all that is most difficult about his work. Against those critics who find the eschatological dimensions of Benjamin’s texts unpalatable and/or philosophically bankrupt, however, the wager of this paper is that it ...

84 Optic Flow

OPTIC FLOW IS THE PATTERN of motion present at the eye of a moving observer. Such flow patterns contain information about self-motion, moving objects, and the threedimensional (3D) layout of the environment, and could potentially be exploited to control locomotion. The term was first used by Gibson (1950) to generalize Helmholtz's notion of motion parallax from single objects to the continuous ...