dixoncoles_ext: A generic Dixon-Coles model for estimating team strengths

In Torvaney/regista: Soccer Analytics

Description

This is an implementation of the Dixon-Coles model for estimating soccer teams' strength from goals scored and conceded:

Dixon, Mark J., and Stuart G. Coles. "Modelling association football scores and inefficiencies in the football betting market." Journal of the Royal Statistical Society: Series C (Applied Statistics) 46, no. 2 (1997): 265-280.

By specifying the model as a pair of formulas, it allows the user to estimate the effect of parameters beyond team strength.

Usage

dixoncoles_ext(f1, f2, weights, data, init = NULL, ...)

Arguments

f1	A formula describing the model for home goals.
f2	A formula describing the model for away goals.
weights	A formula describing an expression to calculate the weight for each game.
data	Data frame, list or environment (or object coercible by 'as.data.frame' to a data frame) containing the variables in the model.
init	Initial parameter values. If it is 'NULL', 0 is used for all values.
...	Arguments passed onto 'optim'.

Value

A list with component 'par' containing the best set of parameters found. See 'optim' for details.

Examples

fit <- dixoncoles_ext(hgoal ~ off(home) + def(away) + hfa + 0,
                      agoal ~ off(away) + def(home) + 0,
                      weights = 1,  # All games weighted equally
                      data = premier_league_2010)

Torvaney/regista documentation built on June 7, 2021, 12:21 a.m.