Statistical inference with Maryland crime data

R로 배우는 계층 및 혼합 효과 모형

Richard Erickson

Data Scientist

Maryland crime data

Number of violent crimes per year by County

             County    Year Crime
        ANNE ARUNDEL   2006  3167
        BALTIMORE CITY 2006 10871

Useful for policy/crime analysis or insurance
Is the crime rate changing through time across counties?

Null hypothesis test

$H_0$ : No difference exists
$H_a$: A difference exists

P-values with lmer

library(lmerTest)
summary(lmer(...))

ANOVA

Analysis of Variance (ANOVA)
Compare variability of model with and without parameter
lmer(response ~ (1 | group)) vs. lmer(response ~ predictor + (1 | group))

Summary

Null hypothesis testing and ANOVAs
Build and compare models
High-level details, important assumptions covered in other DataCamp courses

Let's practice!

R로 배우는 계층 및 혼합 효과 모형

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