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Math scores for basic math and word problems

Source: R/datasets.R
mathscore.Rd

Scores for two groups of school children taught by different math teachers and tested for both basic math (BM) problems and solving word problems (WP).

Format

A data frame with 12 observations on the following 3 variables.

group

a factor with levels 1 2

BM

Basic Math score, a numeric vector

WP

Word Problems score, a numeric vector

Source

Fictitious data

Examples


data(mathscore)
str(mathscore)
#> 'data.frame':	12 obs. of  3 variables:
#>  $ group: Factor w/ 2 levels "1","2": 1 1 1 1 1 1 2 2 2 2 ...
#>  $ BM   : int  190 170 180 200 150 180 160 190 150 160 ...
#>  $ WP   : int  90 80 80 120 60 70 120 150 90 130 ...

math.mod <- lm(cbind(BM, WP) ~ group, data=mathscore)
car::Anova(math.mod)
#> 
#> Type II MANOVA Tests: Pillai test statistic
#>       Df test stat approx F num Df den Df    Pr(>F)    
#> group  1   0.86518   28.878      2      9 0.0001213 ***
#> ---
#> Signif. codes:  0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1

# scatterplot with data ellipses
car::scatterplot(WP ~ BM | group, data=mathscore, 
  ellipse=list(levels=0.68), smooth=FALSE, pch=c(15,16), 
  legend=list(coords = "topright"))


# HE plot
heplot(math.mod, fill=TRUE, 
  cex=2, cex.lab=1.8,
  xlab="Basic math", ylab="Word problems")