To illvesligale Ille allruislic bellavior of IIollle reared, illslituliollllli.ed, allli slreel cllildrell, olle-llulldredrnsevellty four subjecls rallgillg frolll sevell 10 eigilteell years were adlllillislered a prosocilll 1II0livaliollrnquesliollllaire (PSMQ). Equalllumbers of subjecls were lakell frolll eacll group; witll equal lIumber ofrnlIIale alld felllale subjecls; alld willi equalllulllber of subjecls frolll eacll age calegory. HOlllogellelty of _rnvarialloe assulllptioll was foulld 10 be lellable usillg Levelles lesl of IIolllogelleily of variallce. Norlllalilyrnof Ille dislribullOII of allrulstic bellavior III Ille populalioll was also fOlllldlo be lellable elllployillg a ellirnsquare lesl. Firsl olle-way belweell-subjecls ANOVA lesled Ille efJecls oJ residelllial sellillg 011 Illernaltruistic behavior of home-reared, ills/illil/oualized ami l'lreel chill/rell. Seeo",1 tI 2(sex: IIIlIle, female)rnx3(residelllial sellillg: Itollle reared, itlsliluliollaliud, slreel cltildrell) x3(age :7-10, 11-14, 15-18)rnfactorial alllilysis of variallce tested the effects of sex, residential settillg, alld age 011 the altruisticrnbehaviors of frome-reared, institutionalizel/, and street chiltlrell, respectively. Third, a 3(familyrnsize:small,lIIel/iulIl,large)x3(birtlz order: first borll, last baril, lIeither)x3(malerllal presellce:a!ive,dOJlIIOIrnalive, separaled) faclorial allalysis of vilrillllce lesled lite effecls of falllily siu, birllt order, ami IIIlllemalrnpresence all the altruistic behaviors of home-reared c/tildrell. Since t/rere are six COlls/rllcts lIuderlyillgrntire PSMQ, each of 'he above methods was performed 011 eaell o[ tile six altruiJlie orientatiolls, Resultsrnof lite olle-way belweell-sllbjecls ANOVA 011 lite six aitrllislic orielllllliolls by resilielllilli _,ellillg Jor liternIltree residelltial sellillgs were 1101 eqlllli (P