FreeRADIUS Log formats

Hello, I am fairly new to FreeRADIUS and I am looking for some documentation on the format of the log produced by the FreeRADIUS daemon. I have checked the website and the wiki but have not been able to come up with much. google also returned little. I am looking for at least an overview of the logs that can be generated by FreeRADIUS as I hope to write a reporting tool to assist in processing these logs. Any information you could share would be greatly appreciated. Thanks, Will