Hi. 

I'd like to do a t-test to compare the Delta values of items with Crit=1
with Delta values of items with Crit=0. What is the t.test syntax?

It should produce a result like this below (I can't get in touch with the
person who originally did this for me)

    Welch Two Sample t-test

data:  t1$Delta by Crit
t = -3.4105, df = 8.674, p-value = 0.008173 alternative hypothesis: true
difference in means is not equal to 0
95 percent confidence interval:
 -0.04506155 -0.00899827
sample estimates:
mean in group FALSE  mean in group TRUE 
         0.03331391          0.06034382 

Thanks.

------------------------------------
Steven F. Freeman * Center for Organizational Dynamics * University of
Pennsylvania * (215) 898-6967 * Fax: (215) 898-8934 * Cell: (215) 802-4680 *
stfreema@sas.upenn.edu * http://center.grad.upenn.edu/faculty/freeman.html 


	[[alternative HTML version deleted]]


