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Sampling method  
¡¡¡¡¡¡¡¡Probability sampling
¡¡¡¡¡¡¡¡Non-probability sampling
Desk survey method
¡¡¡¡¡¡¡¡Inner material analyze
¡¡¡¡¡¡¡¡Outside information collect
Actual place survey method
¡¡¡¡¡¡¡¡Interrupt visit
¡¡¡¡¡¡¡¡Indoor visit
¡¡¡¡¡¡¡¡Group focus meeting
¡¡¡¡¡¡¡¡Tel visit
¡¡¡¡¡¡¡¡Mail visit
¡¡¡¡¡¡¡¡Diary survey
¡¡¡¡¡¡¡¡Direct watch survey
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