????(Simple regression)??????????????????? - PowerPoint PPT Presentation

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????(Simple regression)???????????????????

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Title: ????(Simple regression)???????????????????


1
??????
  • ?????
  • ????
  • ????
  • ????
  • ????

2
????
  • ??????
  • ????(Simple regression)???????????????????
  • ???(Multiple regression)???????????????????
  • ?????(Logistic regression)??????????????0-1???

3
??????
4
????(regression line)
  • ????????????? y ????? x ???????,??? x
    ???????????????? y?
  • ????????20??,??????????????????????490 cu. ft ?

5
??????
(20, 5)
6
????
  • ?????????????? y ?????
  • ??? y ??? - ??? y ????, ????????
  • ???????? 20??,???????????? 510 cu. ft,? ??
    510 - 490 20?

7
??????
???
??
??? y
8
????????
  • ???????????????????,?????????? (Least square
    regression line)?
  • ????????????,??????????????

9
???????????
  • ??????? y a bx,?? xi ?? yi ?????
    ,???????? ?
  • ???????????????????? a, b ????
  • ?????????? ?

10
??????????
  • ???? ?
  • ?????????? ?

11
????????-minitab
12
????????-minitab?
13
?????????
  • ????????????? y ????? x ????????
  • ???? y ????? x ?????????????
  • ????????????????? b r (sy/sx)

14
?????
15
?????????(?)
  • ???????? ??
  • ??????? ?, ?
    ???? ????
    ???????

16
?????????(??)
  • ???????????????
  • ???????????? y ????, ??? x ????????(??)?

17
??(Residuals)
  • ??? y ???? ???????
  • ???????

18
???(Residuals Plot)
  • ??????????????,??????
  • ?????????????????
  • ????????
  • ??????? x ???????????

19
?????
4
2
0
- 2
- 4
x
20
??????
4
2
0
- 2
- 4
x
21
??????
4
2
0
- 2
- 4
x
22
????????
  • ?????????,??????????
  • Child 19
  • ?????????????????????????,??????
  • x ???(???)??,??????
  • Child 18

23
?????
  • ?????????????Gesell ????????????
  • ??????
  • ????,?????

24
?????
Child 19
Child 18
25
?????
Child 19
Child 18
26
???????????
Child 19
Child 18
27
????????
28
???????????
  • ???????????????????????,??????????????
  • ????????20??,??????????????????????490 cu. ft ?

29
??(Extrapolation)??
  • ??????????????????????? y?,??????????
  • ?38??????????????,??25?????(?????8???)??????

30
?????
  • ???????(????????)?????,??????????(???????)?????
  • ?????????????????????

31
?????
32
?????
  • ?? y ????? x1, x2,, xp???????????????
  • ????????? a1x1a2x2apxp??? y ??????

33
???????
  • ???????? y,??????????? x1????? x2?
  • ?????y,????????? x (x1 x2)/2 ??????
  • ?????y,??????????? x ax1 bx2??????
  • ?a, b ?? corr(y, ax1bx2)????

34
?????
  • ?? y ????? x1, x2? n ?????? yi, x1i, x2i,
    i 1,, n ???????
  • ????????? ?
  • ??????,?????? yi, x1i, x2i, i
    1,, n ????

35
????????
  • ??????? Normal Equations ??
  • ? ????????????,???????

36
???????????

  • ???

37
?????
  • ???????????????,???????? CPA ?????????

38
????
  • ?????

39
?????(Score vs. GPA.)
40
GPA?Score?????
41
?????(Score vs. Exp.)
42
Experience?Score?????
43
GPA ? Exp ? Score ????
44
????????
45
??????
  • ??i,?? ?????? ??????????
  • ?????? ,??
  • ??? H0?
  • ?? ,???????

46
??????
  • bj ? 100(1-a) ?????
  • ? x10, x20 ???, ? 100(1-a) ????? ??

47
?????
  • ????
  • k ??? SSE ??,? R2 ??
  • ??????
  • k ??? SSE ??,? ??, ? Adj R2 ?????

48
???????????k
49
????
  • ???????,? x3????? x31 ??,x30 ??,????
  • ????????? 2k ??? k ????????
  • ?? (x3, x4) (0,0)????,(0, 1)????,(1,
    0)????,(1, 1)????,?? 2 ??????????

50
Score vs. GPA???(by Sex)
51
??????????
52
???????????
????? Score -9.723.1GPA17.4Sex
?, sex1,
Score 7.723.1GPA
?, sex0,
Score -9.723.1GPA
53
???????????
54
???????????
55
????????????
56
???????
  • ???????,????? x2?(??)??,????????
    ?,?
  • ???????,?????? p ??,???

57
???????
58
????????
59
?????????????
60
?????????????
61
???????
  • ??????
  • ???????????
  • ????????
  • ?????????????

62
???????
63
?????????
  • ????????

64
?????
  • ?????????????,??????????????????????(multi-colline
    arity)???
  • ?????????????(variance inflation factor, ???
    VIF)???????

65
??????(VIF)
  • ?????????????????? bk ? s 2???????? bk
    ???????bk????? s 2(bk) s 2(VIF)k,??(VIF)k???
    bk ????????
  • ???,(1 - R2k)-1 ?(VIF)k???,?? R2k ?Xk
    ??????????????
  • ??? (VIF)k ?? (VIF)k ??????????????????
  • ????, (VIF)k??10????????
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