twins49
twinsBurt’stwindata
Description
ThegivendataareIQscoresfromidenticaltwins;oneraisedinafosterhome,andtheotherraisedbybirthparents.Format
Thisdataframecontainsthefollowingcolumns:CSocialclass,1=high,2=medium,3=lowIQbbiologicalIQffosterSource
Burt,C.(1966).Thegeneticestimationofdifferencesinintelligence:Astudyofmonozygotictwinsrearedtogetherandapart.Br.J.Psych.,57,147-153.References
Weisberg,S.(2005).AppliedLinearRegression,3rdedition.NewYork:Wiley,Problem6.16.Examples
data(twins)
ufcHeight-diameterdataforUpperFlatCreek,Idaho
Description
ThesedataareforestinventorymeasuresfromtheUpperFlatCreekstandoftheUniversityofIdahoExperimentalForest,dated1991.
The?leufccontainsallthedata.ufcwccontainsonlyWesternredcedar.ufcgfcontainsonlygrand?r.Usage
data(ufcgf)
50Format
Adataframewiththefollowing5variables.PlotPlotnumberTreeTreewithinplot
UN1
SpeciesafactorwithlevelsDF=Douglas-?r,GF=Grand?r,SF=Subalpine?r,WL=Western
larch,WC=Westernredcedar,WP=WhitepineDbhDiameter137cmperpendiculartothebole,mmHeightHeightofthetree,indecimetersSource
AndrewRobinsonReferences
Weisberg,S.(2005).AppliedLinearRegression,thirdedition.NewYork:Wiley.Examples
data(ufcgf)
UN1NationalstatisticsfromtheUnitedNations
Description
Demographicdatafor193places,mostlyUNmembers,butalsootherareaslikeHongKongthatarenotindependentcountries.Usage
data(UN)Format
Thisdataframecontainsthefollowingcolumns:
LocalityLocalityname.Insomecases,thegeographicareaissmallerthanacountry;forexample,
HongKongFertilityExpectednumberoflivebirthsperfemale,2000PPgdpPercapita2001GDP,inUS$Details
ThesedatawerecollectedatpublishedbytheUNfromavarietyofsources.Seeoriginalsourceforadditionalfootnotesconcerningvaluesforindividualcountries.Countrynamesaregiveninthe?rstcolumnofthedata?le.
