isPDF

A string that identifies a file name (and directory path) of
the PDF candidate.

aFileName

Provides more elaborate description of why the file could not 
be evaluated as a PDF (e.g., when validating a PDF online). When 
<code>"quiet"</code>, an error message is not generated.

verbose

Checks if provided file is in Portable Document Format (PDF).

Functionalities for facilitating systematic reviews, data
extractions, and meta-analyses. It includes a GUI (graphical user interface)
to help screen the abstracts and titles of bibliographic data; tools to assign
screening effort across multiple collaborators/reviewers and to assess inter-
reviewer reliability; tools to help automate the download and retrieval of
journal PDF articles from online databases; figure and image extractions
from PDFs; web scraping of citations; automated and manual data extraction
from scatter-plot and bar-plot images; PRISMA (Preferred Reporting Items for
Systematic Reviews and Meta-Analyses) flow diagrams; simple imputation tools
to fill gaps in incomplete or missing study parameters; generation of random
effects sizes for Hedges' d, log response ratio, odds ratio, and correlation
coefficients for Monte Carlo experiments; covariance equations for modelling
dependencies among multiple effect sizes (e.g., effect sizes with a common
control); and finally summaries that replicate analyses and outputs from
widely used but no longer updated meta-analysis software (i.e., metawin).
Funding for this package was supported by National Science Foundation (NSF)
grants DBI-1262545 and DEB-1451031. CITE: Lajeunesse, M.J. (2016)
Facilitating systematic reviews, data extraction and meta-analysis with the
metagear package for R. Methods in Ecology and Evolution 7, 323-330
<doi:10.1111/2041-210X.12472>.

isPDF: Evaluates whether a file is a PDF document.

Description

Usage

Arguments

Value