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<html> |
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<body bgcolor = "#FFFFCC"><basefont face = "sans-serif"> |
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<h1>File Loader </h1> |
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<h2>Help Page</h2> |
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<hr size = 10> |
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<h2> File Formats </h2> |
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MeV supports the loading of several file formats. For a complete |
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description refer to the manual included in the documentation |
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folder appendix 11. Here's a brief overview of supported file types. |
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<br> |
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<h3>mev Format (Multiple Experiment Viewer Format)</h3> |
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This format is a tab delimited text file format which allows a header |
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for identification of columns and comments are preceded by the pound (#) sign. |
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The first nine columns are a unique identifier, slide row, slide column, |
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meta row, meta column, sub row, sub column, intensity 1, intensity 2. The unique |
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identifier is used to match up corresponding annotation which is supplied from |
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annotation files which contain spot annotation for each element on the slide. |
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<br> |
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The annotation files, given a .ann extension are also tab delimited and |
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have entries corresponding to the unique identifiers in the mev file. |
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One or more annotation files may be loaded to provide several types of |
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annotation. |
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<br> |
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<h3>Tab Delimited, Multiple Sample (TDMS) Format</h3> |
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The TDMS format file encapsulates several hybridizations in one file. |
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The first several columns are used for annotation and following the |
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annotation the intensity data corresponds to one column of log<sub>2</sub>ratio(cy5/cy3) |
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for each hybridization. The format includes a header to identify the |
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labels for the annotation as well as the labels for the individual hybridizations. |
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<br> |
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<h3>tav Format (TIGR Array Viewer Format)</h3> |
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This is similar to the mev format but differs in that it does not permit |
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a header row or comment rows and there is no unique ID column. Each tav file contains |
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annotation following the columns for intensity and other spot specific information. |
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<br> |
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The loading of tav files depends on having selected a 'preference' file which is used |
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to identify the type and number of annotation fields in the tav files. |
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<br> |
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<h3>Affymetrix File Format</h3> |
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Affymetrix arrays use a single dye system. The file description is detailed on |
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the Affymetrix web site but includes a Affy probe identifier, an intensity |
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value, a detection flag to indicate whether or not a spot signal is present or absent, |
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and a spot description. |
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<br> |
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<h3>Gene Pix File Format</h3> |
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<br> |
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|
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<h2>Loading Files</h2> |
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Loading requires several basic steps that vary slightly depending on the file |
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format chosen. |
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<br> |
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1.) Select a file format.<br> |
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2.) Select a directory using the file navigation tree in the left window |
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until the selected files are reached.<br> |
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3.) Select the data file or files.<br> |
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<h3>mev Format</h3> |
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For mev format you will select several data files in the available files list |
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and use the add button to move them into the selected file list box. The same |
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process is used to select one or more annotation files. Once these files are selected |
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hit the OK button to load the files.<br> |
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<h3>Tab Delimited, Multiple Sample (TDMS) Format</h3> |
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For TDMS format you will select a path to the data file and once a file |
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is selected a table will display the first few rows of the file. Select the |
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first log ratio of the first, left most, hybridization in the table. This will |
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identify the upper left limit of the log ratio data. Columns to the left contain |
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annotation while columns above contain header information. Once the proper cell |
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has been selected the annotation field names should appear in a window near the bottom |
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of the form. Select OK to load.<br> |
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<br> |
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<h3>tav Format</h3> |
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For tav Format there are several means to load the files. The most common is to |
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use a preference file to indicate annotation fields in the file. See the manual |
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for a full description of the tav format and the use of preference files. |
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Navigate through the tree to select the tav files then use the file browser button |
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to select an associated preference file.<br> |
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<h3>Affymetrix Format</h3> |
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There are four modes to loading Affymetrix files. <br> |
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1.) The absolute selection simply loads |
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the single intensity value into one channel and sets the other channel to 1.0. |
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This will require the user to scale the expression image, set ratio scale, to |
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increase the dynamic range of the image to compensate for the absolute intensities. |
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<br> |
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2.) The mean and median modes are related. For each spot the intensity is averaged |
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or the median is taken across the hybridizations (files). This average value is used as a reference to |
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scale the intensities corresponding the that spot. Each spot gets assigned one intensity |
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to the spots true intensity and the other intensity is set to the mean or median |
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intensity. The calculated log2(r) is taken where <br> |
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<br> |
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r = (spot intensity)/(ave. intensity) <br> |
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<br> |
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3.) The reference loading mode allows the user to select a file to represent |
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a reference against which the other files are compared. <br><br> |
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log<sub>2</sub>(spot intensity/ref. intensity)<br> |
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<br> |
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<br> |
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Please refer to the manual for more details and information regarding file formats |
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and loading data. |
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<br> |
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</basefont> |
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</body> |
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</html> |