probability of a stimulus

David Vinson d.vinson at ucl.ac.uk
Thu Jun 18 11:01:56 UTC 2009


saraag wrote:
> I have present one stimulus on the slide display, but the choice will
> be between two stimuli, with a probability of 66% for stimulus1 and
> 34% for stimulus2.

One way to do this would be to draw this item from a List containing two items: 
stimulus1 (weight 66) and stimulus2 (weight 34).  If you want exactly 66% and 
34% you could sample without replacement from this List; if approximately 66/34 
is good enough, you could sample with replacement.

-dpv

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