Life-Cycle Consumption: Can Single Agent Models Get it Right?

In the quantitative macro literature, single agent models are heavily used to explain "per-adult equivalent" household data. In this paper, we study differences between consumption predictions from a single agent model and "adult equivalent" consumption predictions from a model where household size evolves deterministically over the life-cycle and affects individual preferences for consumption. Using a theoretical model we prove that, under mild conditions, these predictions are different. In particular, the single household model cannot explain patterns in life-cycle consumption profiles (the so called 'humps'), nor cross sectional inequality in consumption originating from the second model, even after controlling for household size using equivalence scales. Through a quantitative exercise, we then document that differences in predictions can be substantial: total (per-adult equivalent) consumption over the life-cycle can be up to 5% different, depending on the specific parameterization. We find a similar number for total cross sectional inequality

Investigating the Effects of Three Needling Parameters (Manipulation, Retention Time, and Insertion Site) on Needling Sensation and Pain Profiles: A Study of Eight Deep Needling Interventions

Introduction. In traditional Chinese acupuncture, needle sensation (deqi) is purported to contribute to a therapeutic outcome. While researchers have attempted to define deqi qualitatively, few have examined the effects of needling parameters on its intensity. Methods. 24 healthy subjects completed eight interventions scheduled at least one week apart, which involved manual acupuncture to LI4 or a designated nonacupoint (NAP) on the hand, with real or simulated manipulation each three minutes and needle retentions of one or 21 minutes. Intensities of needling sensation and pain were reported every three minutes and sensation qualities were reported post-intervention. Results. Immediately after needle insertion, similar levels of mean needle sensation and of pain were reported independent of intervention. At subsequent measurement times, only two interventions (one at LI4 and one at NAP) maintained statistically significantly elevated needle sensation and pain scores and reported higher numbers of needle sensation descriptors. For both, the needle was retained for 21 minutes and manipulated every three minutes. Neither intervention differed significantly in terms of levels of pain, and needle sensation or numbers and qualities of needle sensation described. Conclusion. In this group of healthy subjects, the initial needling for all eight interventions elicited similar levels of needle sensation and pain. These levels were only maintained if there was ongoing of needle manipulation and retention of the needle. By contrast, the strength of needle sensation or pain experienced was independent of insertion site

Development of an Instrument to Assess the Quality of Acupuncture: Results from a Delphi Process

Background: Quality acupuncture influences the outcomes of clinical research, and issues associated with effective administration of acupuncture in randomized controlled trials need to be addressed when appraising studies. Objective: The study objective was to achieve consensus on domains and items for inclusion in a rating scale to assess quality acupuncture administered in clinical research. Study design and subjects: An active group of Australian acupuncture researchers initially identified a pool of items assessing quality. The Delphi consensus process was then used to select and reduce the number of items, and an additional expert panel of 42 researchers were invited to participate. Participants initially ranked items along a five-point scale for the first Delphi round, and indicated an agree or disagree response during the second round. For an item to be retained into the second round, an item had to attain greater than 80% agreement that the item described a dimension of quality acupuncture and related study design. Results: Thirty-two (32) experts agreed to participate in the study. After two rounds of the Delphi process, consensus was reached on 14 domains and 26 items relating to quality acupuncture. Domains, items, and minimum standards related to study design; rationale of the intervention; criteria relating to needling stimulation either manual or electrostimulation; duration and frequency of treatment; and practitioner training. Conclusions: Items for inclusion in an instrument to assess quality acupuncture in clinical research were identified. Further development of the instrument including relative weighting of items and reliability testing is under way. © 2011, Mary Ann Liebert, Inc