Request for mlogit support

[jamgreen]

The mlogit package for multnomial logit estimation would be a valuable addition to broom capabilities.

[RMHogervorst]

you could use nnet::multinomial as an alternative?
They already work in broom

[IndrajeetPatil]

Just posting an example to show that it doesn't work with mlogit objects.

# setup and data
set.seed(123)
library(mlogit)
#> Loading required package: Formula
#> Loading required package: zoo
#> 
#> Attaching package: 'zoo'
#> The following objects are masked from 'package:base':
#> 
#>     as.Date, as.Date.numeric
#> Loading required package: lmtest
data("Fishing", package = "mlogit")
Fish <- mlogit.data(Fishing, varying = c(2:9), shape = "wide", choice = "mode")

# a pure "conditional" model
mod <- mlogit(mode ~ price + catch, data = Fish)

# summary
summary(mod)
#> 
#> Call:
#> mlogit(formula = mode ~ price + catch, data = Fish, method = "nr")
#> 
#> Frequencies of alternatives:
#>   beach    boat charter    pier 
#> 0.11337 0.35364 0.38240 0.15059 
#> 
#> nr method
#> 7 iterations, 0h:0m:0s 
#> g'(-H)^-1g = 6.22E-06 
#> successive function values within tolerance limits 
#> 
#> Coefficients :
#>                       Estimate Std. Error  z-value  Pr(>|z|)    
#> boat:(intercept)     0.8713749  0.1140428   7.6408 2.154e-14 ***
#> charter:(intercept)  1.4988884  0.1329328  11.2755 < 2.2e-16 ***
#> pier:(intercept)     0.3070552  0.1145738   2.6800 0.0073627 ** 
#> price               -0.0247896  0.0017044 -14.5444 < 2.2e-16 ***
#> catch                0.3771689  0.1099707   3.4297 0.0006042 ***
#> ---
#> Signif. codes:  0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
#> 
#> Log-Likelihood: -1230.8
#> McFadden R^2:  0.17823 
#> Likelihood ratio test : chisq = 533.88 (p.value = < 2.22e-16)

# confidence intervals for coefficients
confint(mod)
#>                           2.5 %      97.5 %
#> boat:(intercept)     0.64785507  1.09489475
#> charter:(intercept)  1.23834489  1.75943188
#> pier:(intercept)     0.08249473  0.53161576
#> price               -0.02813012 -0.02144898
#> catch                0.16163032  0.59270739

# tidier exists?
broom::tidy(mod)
#> Error: No tidy method for objects of class mlogit

^{Created on 2019-03-18 by the reprex package (v0.2.1.9000)}

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