roulette: Elicit one set of probabilities using the roulette method.
Description
Produces a graphics window with the roulette grid. The user clicks in the
window to allocate 'chips' to 'bins'. The elicited probability inside each
bin is the proportion of chips in each bin.
The lower limit on the x-axis of the roulette grid.
upper
The upper limit on the x-axis of the roulette grid.
gridheight
The maximum number of chips that can be allocated to a
single bin.
nbins
The number of equally sized bins drawn between Lo and
Up.
round.end
If set to T, empty bins and the uppermost non-empty
bin will be ignored. For example, with 20 chips in total, if the uppermost
non-empty bin is [70,80] and contains 1 chip, setting round.end = F
will result in an elicited probability P(X>80)=0, but setting
round.end = T will remove this judgement, instead only having
P(X>70)=0.05.
Value
A list, with outputs
v
upper limits of
each bin.
p
cumulative probabilities for each
upper bin limit.
## Not run: # x <- roulette()# # Then allocate chips to bins# # # To fit distributions and see the results# myfit <- fitdist(vals = x$v, probs = x$p)# plotfit(myfit)# ## End(Not run)