Day bias on the ASX?

[Bin57again]

Is there a day bias historically for going long/short in the ASX? Recently been reading some of Larry Williams' stuff and he seems to use his TDW (Trading Day of the Week) to take average systems and make them better. I'm starting off from a cynical position but are there certain days of the week in which it's better to buy than on other days?
Cheers,
Bin