Home > Documents > Stats Homework ( R)

# Stats Homework ( R)

Date post: 25-Feb-2016
Category:
Author: barid
View: 52 times
Description:
Stats Homework ( R). help(swiss ) Fertility ‘common standardized fertility measure’ Examination % draftees receiving highest mark on army examination Education % education beyond primary school for draftees. Catholic % ‘catholic’ (as opposed to ‘protestant’ ) - PowerPoint PPT Presentation
Embed Size (px)
Popular Tags:

#### speed5 ablineh

of 15 /15
Stats Homework (R) • help(swiss) – Fertility • ‘common standardized fertility measure’ – Examination • % draftees receiving highest mark on army examination – Education • % education beyond primary school for draftees. – Catholic • % ‘catholic’ (as opposed to ‘protestant’) • Is there a relationship between education and fertility? – Draw appropriate conclusions – Provide appropriate evidence (plots, stats) • Is there a relationship between education and examination? – Is the relationship the same for Catholic and Protestant provinces? – Provide appropriate evidence (plots, stats)
Transcript Stats Homework (R)• help(swiss)

– Fertility• ‘common standardized fertility measure’

– Examination• % draftees receiving highest mark on army examination

– Education• % education beyond primary school for draftees.

– Catholic• % ‘catholic’ (as opposed to ‘protestant’)

• Is there a relationship between education and fertility?– Draw appropriate conclusions– Provide appropriate evidence (plots, stats)

• Is there a relationship between education and examination?– Is the relationship the same for Catholic and Protestant provinces?– Provide appropriate evidence (plots, stats)   Plot Example

• help(ldeaths)• plot(mdeaths, col="blue", ylab="Deaths", sub="Male (blue),

Female (pink)", ylim=range(c(mdeaths, fdeaths)))• lines(fdeaths, lwd=3, col="pink")• abline(v=1970:1980, lty=3)• abline(h=seq(0,3000,1000), lty=3, col="red") Periodicity

• plot(1:length(fdeaths), fdeaths, type='l')• lines((1:length(fdeaths))+12, fdeaths, lty=3) Type Argument

par(mfrow=c(2,2))plot(fdeaths, type='p', main="points")plot(fdeaths, type='l', main="lines")plot(fdeaths, type='b', main="b")plot(fdeaths, type='o', main="o") ScatterPlot

• plot(as.vector(mdeaths), as.vector(fdeaths))• g=glm(fdeaths ~ mdeaths)• abline(g)• g\$coef

(Intercept) mdeaths -45.2598005 0.4050554 Hist & Density

• par(mfrow=c(2,1))• hist(fdeaths/mdeaths,

nclass=30)• plot(density(fdeaths/mdeaths)) Data Frames

• help(cars)• names(cars)• summary(cars)• plot(cars)

• cars2 = cars• cars2\$speed2 = cars\$speed^2• cars2\$speed3 = cars\$speed^3• summary(cars2)• names(cars2)• plot(cars2)• options(digits=2)• cor(cars2) Normalitypar(mfrow=c(2,1))plot(density(cars\$dist/

cars\$speed))lines(density(rnorm(1000000,

mean(cars\$dist/cars\$speed), sqrt(var(cars\$dist/ cars\$speed)))), col="red")

qqnorm(cars\$dist/cars\$speed)

abline(mean(cars\$dist/cars\$speed), sqrt(var(cars\$dist/cars\$speed))) Stopping Distance Increases Quickly With Speed

• plot(cars\$speed, cars\$dist/cars\$speed)

• boxplot(split(cars\$dist/cars\$speed, round(cars\$speed/10)*10)) plot(cars\$speed, cars\$dist)cars\$speed2 = cars\$speed^2g2 = glm(cars\$dist ~ cars\$speed2)lines(cars\$speed, g2\$fitted.values) Bowed Residualsg1 = glm(dist ~ poly(speed, 1),

data=cars)g2 = glm(dist ~ poly(speed, 2),

data=cars)par(mfrow=c(1,2))boxplot(split(g1\$resid,

round(cars\$speed/5))); abline(h=0)

boxplot(split(g2\$resid, round(cars\$speed/5))); abline(h=0) Help, Demo, Example• demo(graphics)

– example(plot)– example(lines)– help(cars)– help(WWWusage)– example(abline)– example(text)– example(par)

• boxplots– example(boxplot)– help(chickwts)

• demo(plotmath)

• pairs– example(pairs)– help(quakes)– help(airquality)– help(attitude)– Anorexia

• utils::data(anorexia, package="MASS")

• pairs(anorexia, col=c("red", "green", "blue")[anorexia\$Treat])

• counting– example(table)– example(quantile)– example(hist)– help(faithful) • Randomness– example(rnorm)– example(rbinom)– example(rt)

• Normality– example(qqnorm)

• Regression– help(cars)– example(glm)– demo(lm.glm)

Recommended