How to Prepare Data for BESA Statistics

Module information
Modules	BESA Research Basic or higher, BESA Statistics
Version	6.0 or higher (BR), 1.0 or higher (BS)

Note and general remarks

This article applies to data that are prepared using BESA Research. It is also possible to read data prepared by other programs. For the requirements, please refer to the BESA Statistics manual, the chapter on "Loading data that were created in other software" and the chapter "File formats".

Whatever data format is used, the suggested data organization is to place all data files for one condition (or one group) into a dedicated sub-folder. That will make it easy to load them into BESA Statistics.

Data types accepted by BESA Statistics

The following graph shows the data types that are accepted.

Preparing ERP/ERF data

BESA Statistics needs the following data:

1. ERP or ERF files - one for each subject and each condition
2. elp file - one file for the whole experiment

The ERP/ERF files are exported from BESA Research as ASCII vectorized data (*.avr format). You can do this in the following way:

Using the batch mode:

1. • Use the command "Mark Block" and select the "Whole Segment" option
   • Use the command "Export" and select options "Marked Segment" and "ASCII vectorized".

By hand:

1. • Right-click on an averaged data segment and select "Whole Segment" from the popup menu.
   • Then right-click again and select "Write Segment". In the dialog box (see below), select “ASCII vectorized” and un-tick the “Current filters” checkbox. That will save the data as “.avr” file as required by BESA Statistics.

Repeat these steps for all segments that are required.

The elp file is exported once for all subjects / conditions, and placed into one of the data folders for BESA Statistics. It can be exported by using the menu "File → Head Surface Points and Sensors → Save all Files in Head Coordinates". Then browse to the folder you saved to, and find the "*.elp" file.