Glance at a(n) multinom object

Glance accepts a model object and returns a tibble::tibble() with exactly one row of model summaries. The summaries are typically goodness of fit measures, p-values for hypothesis tests on residuals, or model convergence information.

Glance never returns information from the original call to the modeling function. This includes the name of the modeling function or any arguments passed to the modeling function.

Glance does not calculate summary measures. Rather, it farms out these computations to appropriate methods and gathers the results together. Sometimes a goodness of fit measure will be undefined. In these cases the measure will be reported as NA.

Glance returns the same number of columns regardless of whether the model matrix is rank-deficient or not. If so, entries in columns that no longer have a well-defined value are filled in with an NA of the appropriate type.

Usage

# S3 method for multinom
glance(x, ...)

Arguments

x

A multinom object returned from nnet::multinom().

...

Additional arguments. Not used. Needed to match generic signature only. Cautionary note: Misspelled arguments will be absorbed in ..., where they will be ignored. If the misspelled argument has a default value, the default value will be used. For example, if you pass conf.lvel = 0.9, all computation will proceed using conf.level = 0.95. Two exceptions here are:

tidy() methods will warn when supplied an exponentiate argument if it will be ignored.
augment() methods will warn when supplied a newdata argument if it will be ignored.

Value

A tibble::tibble() with exactly one row and columns:

AIC: Akaike's Information Criterion for the model.
deviance: Deviance of the model.
edf: The effective degrees of freedom.
nobs: Number of observations used.

Examples


# load libraries for models and data
library(nnet)
#> 
#> Attaching package: ‘nnet’
#> The following object is masked from ‘package:mgcv’:
#> 
#>     multinom
library(MASS)

example(birthwt)
#> 
#> brthwt> bwt <- with(birthwt, {
#> brthwt+ race <- factor(race, labels = c("white", "black", "other"))
#> brthwt+ ptd <- factor(ptl > 0)
#> brthwt+ ftv <- factor(ftv)
#> brthwt+ levels(ftv)[-(1:2)] <- "2+"
#> brthwt+ data.frame(low = factor(low), age, lwt, race, smoke = (smoke > 0),
#> brthwt+            ptd, ht = (ht > 0), ui = (ui > 0), ftv)
#> brthwt+ })
#> 
#> brthwt> options(contrasts = c("contr.treatment", "contr.poly"))
#> 
#> brthwt> glm(low ~ ., binomial, bwt)
#> 
#> Call:  glm(formula = low ~ ., family = binomial, data = bwt)
#> 
#> Coefficients:
#> (Intercept)          age          lwt    raceblack    raceother  
#>     0.82302     -0.03723     -0.01565      1.19241      0.74068  
#>   smokeTRUE      ptdTRUE       htTRUE       uiTRUE         ftv1  
#>     0.75553      1.34376      1.91317      0.68020     -0.43638  
#>       ftv2+  
#>     0.17901  
#> 
#> Degrees of Freedom: 188 Total (i.e. Null);  178 Residual
#> Null Deviance:	    234.7 
#> Residual Deviance: 195.5 	AIC: 217.5

bwt.mu <- multinom(low ~ ., bwt)
#> # weights:  12 (11 variable)
#> initial  value 131.004817 
#> iter  10 value 98.029803
#> final  value 97.737759 
#> converged

tidy(bwt.mu)
#> # A tibble: 11 × 6
#>    y.level term        estimate std.error statistic p.value
#>    <chr>   <chr>          <dbl>     <dbl>     <dbl>   <dbl>
#>  1 1       (Intercept)   0.823    1.24        0.661 0.508  
#>  2 1       age          -0.0372   0.0387     -0.962 0.336  
#>  3 1       lwt          -0.0157   0.00708    -2.21  0.0271 
#>  4 1       raceblack     1.19     0.536       2.22  0.0261 
#>  5 1       raceother     0.741    0.462       1.60  0.109  
#>  6 1       smokeTRUE     0.756    0.425       1.78  0.0755 
#>  7 1       ptdTRUE       1.34     0.481       2.80  0.00518
#>  8 1       htTRUE        1.91     0.721       2.65  0.00794
#>  9 1       uiTRUE        0.680    0.464       1.46  0.143  
#> 10 1       ftv1         -0.436    0.479      -0.910 0.363  
#> 11 1       ftv2+         0.179    0.456       0.392 0.695  
glance(bwt.mu)
#> # A tibble: 1 × 4
#>     edf deviance   AIC  nobs
#>   <dbl>    <dbl> <dbl> <int>
#> 1    11     195.  217.   189

# or, for output from a multinomial logistic regression
fit.gear <- multinom(gear ~ mpg + factor(am), data = mtcars)
#> # weights:  12 (6 variable)
#> initial  value 35.155593 
#> iter  10 value 14.156582
#> iter  20 value 14.031881
#> iter  30 value 14.025659
#> iter  40 value 14.021414
#> iter  50 value 14.019824
#> iter  60 value 14.019278
#> iter  70 value 14.018601
#> iter  80 value 14.018282
#> iter  80 value 14.018282
#> iter  90 value 14.017126
#> final  value 14.015374 
#> converged
tidy(fit.gear)
#> # A tibble: 6 × 6
#>   y.level term        estimate std.error statistic  p.value
#>   <chr>   <chr>          <dbl>     <dbl>     <dbl>    <dbl>
#> 1 4       (Intercept)  -11.2       5.32     -2.10  3.60e- 2
#> 2 4       mpg            0.525     0.268     1.96  5.02e- 2
#> 3 4       factor(am)1   11.9      66.9       0.178 8.59e- 1
#> 4 5       (Intercept)  -18.4      67.9      -0.271 7.87e- 1
#> 5 5       mpg            0.366     0.292     1.25  2.10e- 1
#> 6 5       factor(am)1   22.4       2.17     10.3   4.54e-25
glance(fit.gear)
#> # A tibble: 1 × 4
#>     edf deviance   AIC  nobs
#>   <dbl>    <dbl> <dbl> <int>
#> 1     6     28.0  40.0    32

Usage

Arguments

See also

Value

Examples