Files and Download

 

Most of the experiments in ArrayExpress contain raw data files, and many of these have additional processed data files (but not all experiments have both raw data and processed data). There are several types of data files associated with each experiment that can be downloaded.

Metadata

Name: IDF file
Type: tab-delimited text file
Job: Contains information about the experiment, e.g. description, author, protocols
Best view: Open with spreadsheet software, e.g. Microsoft Excel, OpenOffice Calc
Example: E-MEXP-3682_idf.txt

The IDF file is a representation of the experiment and author information in a downloadable text file

Figure 14 The IDF file is a representation of the experiment and author information in a downloadable text file.

Name: SDRF file
Type: Tab-delimited text file
Job: Represents the relationship between samples and data files
Best view: Open with spreadsheet software, e.g. Microsoft Excel, OpenOffice Calc
Example: E-MEXP-3682_sdrf.txt

The SDRF file is a representation of the “Samples and Data” information in a downloadable text file

Figure 15 The SDRF file is a representation of the "Samples and Data" information in a downloadable text file.

Looking at this file will help you find which files belong to each sample and the experimental conditions to be compared, e.g. which files belong to the control group and which to the test group. Sometimes the file names do not contain any clues, so the information in this file will be vital.