the r book getting started

《the r book getting started》由会员上传分享，免费在线阅读，更多相关内容在工程资料-天天文库。

1、1GettingStarted1.1HowtousethisbookTrytoputyourselfinoneofthefollowingcategories,thengototheappropriatecategoryheadingwithinthissectiontofindsomesuggestionsabouthowyoumightgetbestvaluefromthisbook:
Beginnerinbothcomputingandstatistics(Section1.1.1);
Stu

2、dentneedinghelpwithprojectwork(1.1.2);
DonesomeRandsomestatistics,butkeentolearnmoreofboth(1.1.3);
DoneregressionandANOVA,butwanttolearnmoreadvancedstatisticalmodelling(1.1.4);
Experiencedinstatistics,butabeginnerinR(1.1.5);
Experiencedincomputing,but

3、abeginnerinR(1.1.6);
Familiarwithstatisticsandcomputing,butneedafriendlyreferencemanual(1.1.7).1.1.1BeginnerinbothcomputingandstatisticsThebookisstructuredprincipallywithyouinmind.Therearesixkeythingstolearn:howtoarrangeyourdata,howtoreadthedataintoR,

4、howtocheckthedataoncewithinR,howtoselecttheappropriatestatisticalmodelandapplyitcorrectly,howtointerprettheoutput,andhowtopresenttheanalysisforpublication.Itisessentialthatyouunderstandthebasicsthoroughlybeforetryingtodothemorecomplicatedthings,sostud

5、yChapters3–6carefullytobeginwith.Doalloftheexercisesthatareillustratedinthetextonyourowncomputer.Nowyouneedtodothehardpart,whichisselectingtherightstatisticstouse.Modelchoiceisextremelyimportant,andisthethingthatwilldevelopmostwithexperience.Donotbysh

6、ytoaskforexperthelpwiththis.Neverdoananalysisthatismorecomplicatedthanitneedstobe,sostartbyreadingabouttheclassicalteststoseeifoneofthesefitsyourpurposes(Chapter8).Finally,trytounderstandthedistinctionbetweenregression(Chapter10)wheretheexplanatoryvari

7、ableiscontinuous,andanalysisofvariance(Chapter11),wheretheexplanatoryvariableiscategorical.Oneofthesetwoislikelytobethemostcomplicatedmethodyouwillneed.TheRBook,SecondEdition.MichaelJ.Crawley.©2013JohnWiley&Sons,Ltd.Published2013byJohnWiley&Sons,Ltd.2

8、THERBOOK1.1.2StudentneedinghelpwithprojectworkThefirstthingtoensureisthatyouknowthedifferencebetweenyourresponsevariableandyourexplanatoryvariable,andthedistinctionbetweenacontinuousvariableandacategoricalvariable(Chapter5).Onceyouhavemasteredt