## load package
library("margins")

## code goes here
library(margins)

y = rbinom(n=100, 1, .5)
x1 = rnorm(100)
x2 = runif(100)
x3 = 2*x2
sim_dat <- data.frame(cbind(y, x1, x2, x3))
mylogit <- glm(y ~ x1 + x2 + x3, data = sim_dat, family = "binomial"(link = logit))
sumout <- summary(margins(mylogit))
## There were 20 warnings (use warnings() to see them)
print(sumout)
##  factor    AME SE  z  p lower upper
##      x1 0.0776 NA NA NA    NA    NA
##      x2 0.1430 NA NA NA    NA    NA
##      x3 0.0000 NA NA NA    NA    NA
mylogit
## Call:  glm(formula = y ~ x1 + x2 + x3, family = binomial(link = logit), 
##     data = sim_dat)
## 
## Coefficients:
## (Intercept)           x1           x2           x3  
##     -0.3773       0.3205       0.5906           NA  
## 
## Degrees of Freedom: 99 Total (i.e. Null);  97 Residual
## Null Deviance:      138.5 
## Residual Deviance: 135.5        AIC: 141.5
vcov(mylogit)
##             (Intercept)          x1          x2 x3
## (Intercept)  0.14416731 -0.01185947 -0.21880287 NA
## x1          -0.01185947  0.04196244  0.01843671 NA
## x2          -0.21880287  0.01843671  0.46649843 NA
## x3                   NA          NA          NA NA
coef(mylogit)
## (Intercept)          x1          x2          x3 
##  -0.3773247   0.3204783   0.5905926          NA 
## margins(mylogit)
## Average marginal effects
## glm(formula = y ~ x1 + x2 + x3, family = binomial(link = logit),     data = sim_dat)
## 
##       x1    x2 x3
##  0.07761 0.143  0
## There were 20 warnings (use warnings() to see them)

## session info for your system
sessionInfo()
R version 3.6.1 (2019-07-05)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 7 x64 (build 7601) Service Pack 1

Matrix products: default

locale:
[1] LC_COLLATE=English_United Kingdom.1252  LC_CTYPE=English_United Kingdom.1252   
[3] LC_MONETARY=English_United Kingdom.1252 LC_NUMERIC=C                           
[5] LC_TIME=English_United Kingdom.1252    

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] margins_0.3.23

loaded via a namespace (and not attached):
[1] MASS_7.3-51.4     compiler_3.6.1    data.table_1.12.2 prediction_0.3.14