This page discusses how to use GEOquery package to load GEO data from NCBI

Overview of GEO

The NCBI Gene Expression Omnibus (GEO) serves as a public repository for a wide range of high-throughput experimental data. These data include single/dual channel microarray based experiments measuring mRNA, genomic DNA... There are four basic entity types according to basic level of organization of GEO:

Basic GEOquery Manipulation

Reference: Manual