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Tutorial 4: Step 1 Import the Data


Import the Data

1. Click the Import Gene Expression Data toolbar icon , or select Import from the File menu and Gene Expression Data from the sub menu. The Data Import dialog is displayed.

2. Set the Gene Database to Affymetrix using the drop-down list.

3. The next step is to identify the name and location of the data source file. Click the button to the right of the Source File box. The Open dialog is displayed.

4. The tutorial data files are located in the Tutorial folder. This is the folder listed in Look in, so you do not need to navigate to it. Click the file aml_all.csv.

5. Click Open. The Data Import dialog is updated with the file name.

6. Click Import. The Import Data dialog is displayed.

GeneLinkerô examines the file and offers to transpose it. Within GeneLinkerô, datasets have the genes in columns and the samples in rows.

When importing data using a Tabular template, GeneLinkerô assumes that the more numerous dimension of your data represents genes (most microarray experiments involve more genes than samples). If this is so (as in this tutorial), then clicking OK is all that is required.

Note: the options Use Sample Names and Use Gene Names are checked and disabled in the Import Data dialog box. GeneLinkerô has recognized that in this dataset, the first row and column contain alphameric labels. Gene expression data is always numeric, hence the disabled checkboxes.

7. Click OK. The dataset is imported into GeneLinkerô and a new item, aml_all,  is added to the Experiments navigator.