Fwd: How to determine/maintain probabilistic ratios of stimuli presentations

[Hacker's Dad]

Hi there,

I am new at e-prime. I wish to know the following:

1] How to maintain/determine probabilistic ratios of two kinds of
stimuli (say, a blue and a yellow square) for their appearance on comp
screen over a hundred trials, such that on most key-presses their
predetermined/desired ratios are maintained?

2] How to initialize and declare GLOBAL variables in e-prime?

3] There seems to be some problem with the Debug.print portion in the
code I have written. I am not able to figure out what the problem is.

I shall be grateful for help.

Thanks,
Ravindra

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