Hydra

Hydra is part of HADES.

Introduction

An R package and Java library for hydrating package skeletons into executable R study packages based on specifications in JSON format.

Features

• Contains package skeletons for patient-level prediction and population-level estimation studies.
• Hydrates package skeletons to fully implemented study packages based on a single JSON specification file.
• Is used in WebAPI to allow ATLAS to generate study packages.
• Can be used as stand-alone R package.

Technology

Hydra is an R package, with most functions implemented in Java.

System Requirements

Requires R and Java.

Getting Started

R package

1. See the instructions here for configuring your R environment, including Java.

2. In R, use the following commands to download and install Hydra:

install.packages("remotes")
library(remotes)
install_github("ohdsi/Hydra") 

Java library

You can fetch the JAR files in the inst/java folder of this repository, or use Maven:

1. First add the OHDSI repository so that Maven can find and download the Hydra artifact automatically:

<repositories>
	<repository>
		<id>ohdsi</id>
		<name>repo.ohdsi.org</name>
		<url>https://repo.ohdsi.org/nexus/content/groups/public</url>
	</repository>
</repositories>

2: Include the Hydra dependency in your pom.xml

<dependency>
	<groupId>org.ohdsi</groupId>
	<artifactId>hydra</artifactId>
	<version>0.3.0</version>
</dependency>

User Documentation

Documentation can be found on the package website.

PDF versions of the documentation are also available:

• Vignette: Hydrating packags
• Vignette: Writing Hydra configuration files
• Package manual: Hydra.pdf

Support

• Developer questions/comments/feedback: OHDSI Forum
• We use the GitHub issue tracker for all bugs/issues/enhancements

Contributing

Read here how you can contribute to this package.

License

Hydra is licensed under Apache License 2.0

Development

Hydra is being developed in R Studio.

Development status

Beta.