There exists an ever-increasing number of systematic reviews, with or without meta-analysis, in the field of nutrition. Concomitant with this increase is the increased use of such to guide future research as well as both practice and policy-based decisions. Given this increased production and consumption, a need exists to educate both producers and consumers of systematic reviews, with or without meta-analysis, on how to conduct and evaluate high-quality reviews of this nature in nutrition. The purpose of this paper is to try and address this gap. In the present manuscript, the different types of systematic reviews, with or without meta-analyses, are described as well as the description of the major elements, including methodology and interpretation, with a focus on nutrition. It is hoped that this non-technical information will be helpful to producers, reviewers and consumers of systematic reviews, with or without meta-analysis, in the field of nutrition.

Aggregate data are commonly used to determine returns to storage. However, recent studies have shown that aggregating data may lead to underestimated returns. This article compares aggregate and elevator data from Oklahoma to determine if aggregate data underestimate returns. We find no difference between the mean returns estimated with aggregate data and the mean returns estimated with transaction level data from grain elevators in Oklahoma.

This article is focused on one of the most relevant novelties in the Italian electoral market of the past decade: the emerging phenomenon of intermittent abstentionism. Rather than an increase in overall abstentionism rates, aggregate and survey data show a clear increase in the number of floating voters who swing between voting and non-voting. After a description of the characteristics of intermittent abstensionists, the article discusses the relationship between different electoral systems at different levels of government and territorial differentiation as far as voting participation is concerned. It then discusses the impact of intermittent abstentionism on the results of the 2006 general election where the parties’ electoral campaigns appear to have been aimed at mobilising intermittent abstensionists. The article concludes with some considerations of the Italian electoral cycle, particularly in relation to the changes generated by the run-up to the 2008 elections.

The aggregate implications of the permanent-income/life-cycle hypothesis (PILCH) are derived rigorously. Virtually all empirical rejections of PILCH based on aggregated data are shown to result from misspecifications or from characteristics of aggregate data that have been overlooked. Valid aggregate tests are proposed. Those based on a properly formulated aggregate consumption function may be superior to those based on Euler-equation methods.