Project package libraries and reproducibility

If you are an R user it has probably happened to you that you upgraded some R package in your R installation, and then suddenly your R script or application stopped working. One strategy is that you create a new package library for a new project. A package library is just a directory that holds all installed R packages. (In addition to the ones that are installed with R itself.) This is why we created the pkgsnap tool. This is a very simple package with two exported functions: 1) snap takes a snapshot of your project library. It writes out the names and versions of the currently installed packages into a text file. You can put this text file into the version control repository of the project, to make sure it is not lost, and 2) restore uses the snapshot file to recreate the package project library from scratch. It installs the recorded versions of the recorded packages, in the right order.

Assessing the reproducibility of exome copy number variations predictions

Reproducibility is receiving increased attention across many domains of science and genomics is no exception. Efforts to identify copy number variations (CNVs) from exome sequence (ES) data have been increasing. Many algorithms have been published to discover CNVs from exomes and a major challenge is the reproducibility in other datasets. Here we test exome CNV calling reproducibility under three conditions: data generated by different sequencing centers; varying sample sizes; and varying capture methodology.

Standardized Mixed-Meal Tolerance and Arginine Stimulation Tests Provide Reproducible and Complementary Measures ofb-cell Function: Results From the Foundation for the National Institutes of Health Biomarkers Consortium Investigative Series

Standardized, reproducible, and feasible quantification ofb-cell function (BCF) is necessary for the evaluation of interventions to improve insulin secretion and important for comparison across studies. We therefore characterized the re-sponses to, and reproducibility of, standardized methods of in vivo BCF across different glucose tolerance states. Reproducibility for the AST was very good, with ICC values >0.8 across all variables and populations.

A statistical definition for reproducibility and replicability

Everyone agrees that reproducibility and replicability are fundamental characteristics of scientific studies. These topics are attracting increasing attention, scrutiny, and debate both in the popular press and the scientific literature. But there are no formal statistical definitions for these concepts, which leads to confusion since the same words are used for different concepts by different people in different fields. We provide formal and informal definitions of scientific studies, reproducibility, and replicability that can be used to clarify discussions around these concepts in the scientific and popular press.

In dramatic statement, European leaders call for ‘immediate’ open access to all scientific papers by 2020

In what European science chief Carlos Moedas calls a "life-changing" move, E.U. member states today agreed on an ambitious new open-access (OA) target. All scientific papers should be freely available by 2020, the Competitiveness Council—a gathering of ministers of science, innovation, trade, and industry—concluded after a 2-day meeting in Brussels. But some observers are warning that the goal will be difficult to achieve.

Validity and Reproducibility of a Dietary Questionnaire for Consumption Frequencies of Foods during Pregnancy in the Born in Guangzhou Cohort Study (BIGCS)

This study aimed to examine the reproducibility and validity of a new food frequency questionnaire (FFQ) used in a birth cohort study to estimate the usual consumption frequencies of foods during pregnancy. The reference measure was the average of three inconsecutive 24 h diet recalls (24 HR) administrated between two FFQs, and the reproducibility was measured by repeating the first FFQ (FFQ1) approximately eight weeks later (FFQ2).