AddHealth: Adolescent Health Data

In heplots: Visualizing Hypothesis Tests in Multivariate Linear Models

Description

This data was taken from the National Longitudinal Study of Adolescent Health. It is a cross-sectional sample of participants from grades 7–12, described and analyzed by Warne (2014).

Usage

data("AddHealth")

Format

A data frame with 4344 observations on the following 3 variables.

grade

an ordered factor with levels 7 < 8 < 9 < 10 < 11 < 12

depression

a numeric vector

anxiety

a numeric vector

Details

depression is the response to the question "In the last month, how often did you feel depressed or blue?"

anxiety is the response to the question "In the last month, how often did you have trouble relaxing?"

The responses for depression and anxiety were recorded on a 5-point Likert scale, with categories 0="Never", 1="Rarely", 2="Occasionally", 3="Often", 4="Every day"

Source

Warne, R. T. (2014). A primer on Multivariate Analysis of Variance (MANOVA) for Behavioral Scientists. Practical Assessment, Research & Evaluation, 19 (1). http://pareonline.net/getvn.asp?v=19&n=17

Examples

data(AddHealth)
# fit mlm
AH.mod <- lm(cbind(depression, anxiety) ~ grade, data=AddHealth)

Anova(AH.mod)
summary(Anova(AH.mod))

heplot(AH.mod, hypotheses="grade.L", fill=c(TRUE, FALSE))

Example output

Loading required package: car
Loading required package: carData

Type II MANOVA Tests: Pillai test statistic
      Df test stat approx F num Df den Df    Pr(>F)    
grade  5  0.022415    9.834     10   8676 < 2.2e-16 ***
---
Signif. codes:  0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1

Type II MANOVA Tests:

Sum of squares and products for error:
           depression  anxiety
depression   6058.911 3021.691
anxiety      3021.691 5210.233

------------------------------------------
 
Term: grade 

Sum of squares and products for the hypothesis:
           depression  anxiety
depression  112.76722 87.57399
anxiety      87.57399 75.02650

Multivariate Tests: grade
                 Df test stat  approx F num Df den Df     Pr(>F)    
Pillai            5 0.0224153  9.833964     10   8676 < 2.22e-16 ***
Wilks             5 0.9776192  9.872584     10   8674 < 2.22e-16 ***
Hotelling-Lawley  5 0.0228579  9.911186     10   8672 < 2.22e-16 ***
Roy               5 0.0211939 18.387786      5   4338 < 2.22e-16 ***
---
Signif. codes:  0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1

heplots documentation built on May 31, 2017, 4:54 a.m.