Video: Qhov teeb meem txhais li cas hauv SAS?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
SET nyeem ib qho kev soj ntsuam los ntawm ib qho uas twb muaj lawm SAS cov ntaub ntawv teeb . INPUT nyeem cov ntaub ntawv nyoos los ntawm cov ntaub ntawv sab nraud lossis los ntawm cov kab hauv cov ntaub ntawv txhawm rau tsim SAS variables thiab kev soj ntsuam. Siv qhov KEY = kev xaiv nrog SET tso cai rau koj nkag mus saib cov kev soj ntsuam tsis raws li hauv a SAS cov ntaub ntawv teeb raws li tus nqi.
Hais txog qhov no, dab tsi yog _N_ hauv SAS?
Kev Taw Qhia Yooj Yim. Raws li cov SAS Cov Ntaub Ntawv Kauj Ruam Cov Ntaub Ntawv, ob qhov hloov pauv tsis siv neeg yog tsim nyob rau hauv cov ntaub ntawv kauj ruam. Qhov _ERROR_ hloov pauv thiab cov _N_ sib txawv. Cov _N_ sib txawv yog feem ntau siv los mus taug qab tus naj npawb ntawm cov sij hawm cov ntaub ntawv kauj ruam tau iterated.
Ib sab saum toj no, cov ntaub ntawv _null_ hauv SAS yog dab tsi? Hauv SAS , cov lus tseem ceeb reserved _NULL_ qhia a SAS data teeb uas tsis muaj kev soj ntsuam thiab tsis muaj qhov sib txawv. Cov _NULL_ cov ntaub ntawv teeb feem ntau siv thaum koj xav ua DATA kauj ruam code uas qhia txog qhov tshwm sim, txhais qhov sib txawv ntawm macro, sau cov ntawv nyeem, lossis hu rau EXECUTE subroutine.
Hauv qhov no, qhov sib txawv ntawm Merge thiab teeb tsa hauv SAS yog dab tsi?
Thaum lub SET nqe lus nyeem kev soj ntsuam los ntawm ib cov ntaub ntawv teeb thaum lub sijhawm, cov MERGE nqe lus nyeem los ntawm ob lossis ntau dua cov ntaub ntawv teeb ib txhij. Txij li thaum SAS tuaj yeem tsuas muaj ib tus nqi rau txhua qhov sib txawv, muaj lub rooj sib tham uas tsuas yog tus nqi xwb hauv cov ntaub ntawv hais dhau los teeb yuav dim.
Lub SAS code txhais li cas?
Tus lej lej txhais tau tias yog tus nqi tau los ntawm summing tus nqi ntawm cov lej sib txawv thiab tom qab ntawd faib cov lej nrog tus lej ntawm qhov sib txawv. Siv qhov no SAS txheej txheem peb tuaj yeem nrhiav tau txhais tau tias ntawm tag nrho cov variables los yog ib co variables ntawm ib dataset. Peb kuj tuaj yeem tsim pab pawg thiab nrhiav tau txhais tau tias ntawm qhov sib txawv ntawm qhov tseem ceeb tshwj xeeb rau pawg ntawd.
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