SHELF (version 1.2.0)

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 'probs' to 'bins'. The elicited probability inside each bin is the proportion of probs in each bin.

Usage

roulette(lower = 0, upper = 100, gridheight = 10, nbins = 10, round.end = T)

Arguments

lower

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 probs 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 TRUE, empty bins and the uppermost non-empty bin will be ignored. For example, with 20 probs in total, if the uppermost non-empty bin is [70,80] and contains 1 prob, setting round.end = FALSE will result in an elicited probability P(X>80)=0, but setting round.end = TRUE will remove this judgement, instead only having P(X>70)=0.05.

Value

A list, with outputs A list, with outputs

Examples

## Not run: 
# x <- roulette(lower = 0, upper = 100)
# # Then allocate probs to bins and click "Finish"
# 
# # To fit distributions and see the results
# myfit <- fitdist(vals = x$v, probs = x$p, lower = 0, upper = 100)
# plotfit(myfit)
# ## End(Not run)