Create a decision tree

Source: R/dtree.R

Create a decision tree

dtree(yl, opt = "max", base = character(0), envir = parent.frame())

Arguments

yl

A yaml string or a list (e.g., from yaml::yaml.load_file())
opt

Find the maximum ("max") or minimum ("min") value for each decision node
base

List of variable definitions from a base tree used when calling a sub-tree
envir

Environment to extract data from

Value

A list with the initial tree and the calculated tree

Details

See https://radiant-rstats.github.io/docs/model/dtree.html for an example in Radiant

See also

summary.dtree to summarize results

plot.dtree to plot results

sensitivity.dtree to plot results

Examples

yaml::as.yaml(movie_contract) %>% cat()
#> name: Sign contract
#> variables:
#>   legal fees: 5000
#> type: decision
#> Sign with Movie Company:
#>   cost: legal fees
#>   type: chance
#>   Small Box Office:
#>     p: 0.3
#>     payoff: 200000
#>   Medium Box Office:
#>     p: 0.6
#>     payoff: 1000000
#>   Large Box Office:
#>     p: 0.1
#>     payoff: 3000000
#> Sign with TV Network:
#>   payoff: 900000
dtree(movie_contract, opt = "max") %>% summary(output = TRUE)
#> Decision tree input:
#> name: Sign contract
#> variables:
#>     legal fees: 5000
#> type: decision
#> Sign with Movie Company:
#>     cost: legal fees
#>     type: chance
#>     Small Box Office:
#>         p: 0.3
#>         payoff: 200000
#>     Medium Box Office:
#>         p: 0.6
#>         payoff: 1000000
#>     Large Box Office:
#>         p: 0.1
#>         payoff: 3000000
#> Sign with TV Network:
#>     payoff: 900000
#> 
#> Variable input values:
#>                
#> legal fees 5000
#> 
#> Initial decision tree:
#>                              Probability       Payoff     Cost     Type
#>  Sign contract                                                         
#>   ¦--Sign with Movie Company                          5,000.00 decision
#>   ¦   ¦--Small Box Office        30.00 %   200,000.00            chance
#>   ¦   ¦--Medium Box Office       60.00 % 1,000,000.00            chance
#>   ¦   °--Large Box Office        10.00 % 3,000,000.00            chance
#>   °--Sign with TV Network                  900,000.00          decision
#> 
#> Final decision tree:
#>                              Probability       Payoff     Cost     Type
#>  Sign contract                             955,000.00                  
#>   ¦--Sign with Movie Company               955,000.00 5,000.00 decision
#>   ¦   ¦--Small Box Office        30.00 %   200,000.00            chance
#>   ¦   ¦--Medium Box Office       60.00 % 1,000,000.00            chance
#>   ¦   °--Large Box Office        10.00 % 3,000,000.00            chance
#>   °--Sign with TV Network                  900,000.00          decision