JABt {alphaN}  R Documentation 
Transforms a tstatistic into Jeffreys' approximate Bayes factor
JABt(n, t, method = "JAB", upper = 1)
n 
Sample size. 
t 
The tstatistic. 
method 
Used for the choice of 'b'. Currently one of:

upper 
The upper limit for the range of realistic effect sizes. Only relevant when method="balanced". Defaults to 1 such that the range of realistic effect sizes is uniformly distributed between 0 and 1, U(0,1). 
A numeric value for the BF in favour of H1.
# Transform a tstatistic of 2.695 computed based on a sample size of 200 into JAB
JABt(200, 2.695)