prussian: Prussian army horse kick data

Description Usage Format Source Examples

Description

Deaths by year, by corp, from horse kicks.

Usage

1

Format

A data frame with 280 observations on the following 3 variables.

y

a numeric vector, count of deaths

year

a numeric vector, 18XX, year of observation

corp

a factor, corp of Prussian Army generating observation

Source

von Bortkiewicz, L. 1898. Das Gesetz der Kleinen Zahlen. Leipzig: Teubner.

Examples

1
2
3
data(prussian)
corpP <- glm(y ~ corp, family=poisson,data=prussian)
summary(corpP)

Example output

Loading required package: MASS
Loading required package: lattice
Classes and Methods for R developed in the

Political Science Computational Laboratory

Department of Political Science

Stanford University

Simon Jackman

hurdle and zeroinfl functions by Achim Zeileis


Call:
glm(formula = y ~ corp, family = poisson, data = prussian)

Deviance Residuals: 
    Min       1Q   Median       3Q      Max  
-1.5811  -1.0955  -0.8367   0.5438   2.0079  

Coefficients:
              Estimate Std. Error z value Pr(>|z|)  
(Intercept) -2.231e-01  2.500e-01  -0.893   0.3721  
corpI        4.072e-09  3.535e-01   0.000   1.0000  
corpII      -2.877e-01  3.819e-01  -0.753   0.4512  
corpIII     -2.877e-01  3.819e-01  -0.753   0.4512  
corpIV      -6.931e-01  4.330e-01  -1.601   0.1094  
corpIX      -2.076e-01  3.734e-01  -0.556   0.5781  
corpV       -3.747e-01  3.917e-01  -0.957   0.3387  
corpVI       6.062e-02  3.483e-01   0.174   0.8618  
corpVII     -2.877e-01  3.819e-01  -0.753   0.4512  
corpVIII    -8.267e-01  4.532e-01  -1.824   0.0681 .
corpX       -6.454e-02  3.594e-01  -0.180   0.8575  
corpXI       4.463e-01  3.202e-01   1.394   0.1633  
corpXIV      4.055e-01  3.227e-01   1.256   0.2090  
corpXV      -6.931e-01  4.330e-01  -1.601   0.1094  
---
Signif. codes:  0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1

(Dispersion parameter for poisson family taken to be 1)

    Null deviance: 323.23  on 279  degrees of freedom
Residual deviance: 297.09  on 266  degrees of freedom
AIC: 630.17

Number of Fisher Scoring iterations: 5

pscl documentation built on March 26, 2020, 7:36 p.m.