Microarray and expression

Atlas Arrays

The Power Atlas is a web-based resource to assist investigators in the planning and design of microarray and expression based experiments. This software is currently aimed at estimating the power and sample size for a two group comparison based upon pilot data. The methods underlying the web site are reported in Gadbury et al (2004). More complicated results such as ANOVA are planned for July 2005.

There are two ways to use the Power Atlas:

  1. We have downloaded all the data currently in the Gene Expression Omnibus (GEO) and processed them with our power analysis software. Data from other websites will be added over the next year. Investigators may search among the datasets for the experiment that most closely resembles their proposed project and get the estimate sample sizes and power for this data set.
  2. Investigators may upload their own preliminary data and the program will extrapolate power from this dataset.

If this is your first visit, you may want to read these printer-friendly instructions for using the Power Atlas.