??? ??????? Program Design of Data Step

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??? ??????? Program Design of Data Step

• ?????

2
????

• ?????? DO ??
• ?????? IF ??

3
??????

• ????????????,?????????????,?????
• Do End ??
• ??DO I A to B by C
• lt Loop Body gt
• END
• ??
• DO?????????,???? I ???? A???? B ??? C
  ????,????? END???, ?????? ????????,???????,??????
  ??????????????DO????????????,??????????

4

• ?1??10??
• Data a
• do i0 to 9
• put i Put?????????????
• end
• run
• ????????????,????????(DO END ?????)????????,????
  ??? 1?????????????????????

5

• ????????????
• ?2???????
• Data a
• Do I 1 to 9 ???? 1 ??? 9
• Do j 1 to I ??? 1 ??????
• S I j
• Put I j S _at__at_ _at__at_????????
  
• End
• Put Put ??????????????
• End
• Run

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?? ??? ??? ???
1 5.6 -0.6 12.4
2 9.5 5.7 0.9
3 6.0 12.8 7.0
4 8.7 4.1 3.9
5 9.2 -1.8 1.6
6 5.0 -0.1 6.4
7 3.5 6.3 3.0
8 5.8 12.7 3.9
9 8.0 9.8 2.2
10 15.5 12.6 1.1
11 11.8 2.0 2.7
12 16.3 5.6 7.8
13 11.8 7.0 6.9
14 14.6 7.9 1.5
15 4.9 4.3 9.4
16 8.1 6.4 3.8

• ????????????
• ??????????????,??II????????4????2???????(mmol/L),
  ??

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• Data a
• Do i1 to 16
• Do j1 to 3
• Input x _at__at_
• Output Output?????????????
• End
• End
• Cards
• 5.6 -0.6 12.4 9.5 5.7 0.9 6.0 12.8 7.0
• 8.7 4.1 3.9 9.2 -1.8 1.6 5.0 -0.1 6.4
• 3.5 6.3 3.0 5.8 12.7 3.9 8.0 9.8 2.2
• 15.5 12.6 1.1 11.8 2.0 2.7 16.3 5.6 7.8
• 11.8 7.0 6.9 14.6 7.9 1.5 4.9 4.3 9.4
• 8.1 6.4 3.8
• proc freq
• tables ij
• weight x
• Proc anova

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??????

• ?????????????????????,????,?? IF ?????
• IF Then / Else ??
• ????
• IF lt Expression gt Then lt Statement 1 gt
• Else lt Statement 2 gt
• ????? IF ??????(Expression)??,????????(? 0),???
  Then ??????(Statement 1),??? Else
  ??????????(0),??? Then ??,????? Else ??,????
  Else ??,???????,???? IF ?????????

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• ?1???????????gt280????
• Data a
• Input num s1-s3 _at__at_
• Totalsum( of s1-s3)
• If Total gt 280 then put num Total
• Cards
• 1001 79 96 87 1002 89 96 98 1003 87 69 81
• Run

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• ?2???????????????????
• ?????,??????0-??,1-??,2-?????,3-?????,4-???????
• Data a
• Input x _at__at_
• If 1ltxlt3 Then hq1 xgt1 xlt3
• Else hq0
• If 3ltxlt4 Then sy1 xgt3 xlt4
• Else sy0
• Cards
• 0 1 2 3 4
• Proc print
• Run

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• ?3?????????????
• ???????????? Boy ? Girl?
• Data boy girl
• Input name sex age h w
• If sex M then output boy
• Else output girl
• Cards
• Zhang M 10 140 40
• Wang F 10 142 38
• Li M 11 150 45
• Zhao F 11 145 42
• Run

12

• ?4?????????????
• ????????????
• Data a
• Input num x
• If xlt60 then delete Delete????????
• Cards
• 101 80
• 102 90
• 103 85
• 104 50
• 105 100
• Proc print
• Run

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• ?5Do End ???
• ????????,????????????,?????????
• Data a
• Input num x
• If xlt60 then do
• bk1
• put num x bk
• End
• Else bk0
• Cards
• 101 80
• 102 90
• 103 85
• 104 50
• 105 100
• Proc means
• Var x
• Run

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• ?? IF ?????????
• ???SAS????? IF ???????,???????????????,??????????
  ??
• ????
• IF lt Expression gt
• ????????????,????????(?0),SAS????????????(0),SAS
  ???????????,??Data????,??????????????

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• ???Children???Baby?Girls?
• Data Children
• Input num sex month _at__at_
• Cards
• 1001 F 8 1002 M 9 1003 F 17 1004 M 14
• Data Baby
• Set Children
• If monthlt12
• Data Girls
• Set Children
• If sexF
• Run

16

• ????? Delete ????
• Data Children
• Input num sex month _at__at_
• Cards
• 1001 F 8 1002 M 9 1003 F 17 1004 M 14
• Data Baby
• Set Children
• If monthgt12 then delete
• Data Girls
• Set Children
• If sex ltgtF then delete
• Run