[R] multiple comparison test

[Julie BERTRAND]

hello,
 
after an anova I use pairwise.t.test(), it gives only
p.value and I want the t.stat.
I try to get these by computing the Welch
approximation of the degree of freedom and using the
qt(p.value,df) function but when I test this method
with t.test results (the function gives p.value and
t.test), I doesn't find the same t.stat.
 
I also use the simtest(x~y,type="Tukey") function and
it gives me only negative t.stat, resulting in a weard
distribution...
 
thank you in advance for all the attention you 'll
give to my problems.
Julie BERTRAND