modjitter {adlift} | R Documentation |
This function jitters grid values by a proportion of the regular distance between consecutive gridpoints and then alters it to lie in [0,1].
modjitter(x, amount)
x |
a vector to be jittered (e.g. a gridpoint vector). |
amount |
a value of how much to jitter the vector (expressed as a proportion of the regular gridpoint distance, d). |
The function uses dojitter to jitter the gridpoint vector by (amount*d
) . The endpoints are fixed to be zero and one, and the corresponding jx values to x[2]
and x[length(x)-1]
are randomised again in the intervals [0,x[2]+amount*d]
and [x[length(x)-1]-amount*d,1]
respectively.
jx |
the jittered version of x |
Matt Nunes (matt.nunes@bristol.ac.uk), Marina Popa (Marina.Popa@bristol.ac.uk)
#create grid vector # xgrid<-seq(0,1,length=51) # xgrid # #a regularly-spaced grid on [0,1] # modjitter(xgrid,1) # #jitters xgrid with a maximum change of .02, keeping endpoints of zero and one