ข อด และข อเส ยการเล อกต วอย างแบบเช งส ม

��¶֧ ��ǹ˹�觢ͧ��Ъҡ÷��֡�ҫ��繵��᷹�ͧ��Ъҡ� ��÷��ҧ��繵��᷹��բͧ��Ъҡ��͡��ҧ�ԧ��ѧ��Ъҡ��ҧ��Ͷ�� е�ͧ�ա��͡��ҧ��Т�Ҵ��ҧ�� 觨е�ͧ��ʶԵ��Ҫ��㹡��ҧ��С�á�˹��Ҵ�ͧ��ҧ

��ҧ (Sampling) ��¶֧ ��кǹ��ҫ�觡��ҧ��դ��繵��᷹��բͧ��Ъҡ�

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�Ըա��ҧ��2 ��˭��

��ҧ��Ҩ��(Nonprobability sampling )

�繡��͡��ҧ��ӹ֧��ҵ��ҧ��˹��͡�ʶ١��͡�ҡ��

��Һ��Ҩ��繷��˹��㹻�Ъҡèж١��͡ ��͡��ҧẺ��ö�Ӽŷ��ҧ�ԧ��ѧ��Ъҡ�� դ��дǡ��л��Ѵ��Ф��ҡ�� ö��Ẻ �ѧ��

1.1 ��͡��ҧẺ�ѧ��ԭ(Accidental sampling) �繡��͡��ҧ

��ӹǹ��ͧ��ѡࡳ�� ҧ��á��ö��

1.2 ��͡��ҧẺ�ǵ�� ( Quota sampling ) �繡��͡��ҧ��

�ӹ֧�֧�Ѵ��ǹͧ��Сͺ�ͧ��Ъҡ� ��͵�ͧ��á��ҧ 100�� Ȫ�� 50�� ˭ԧ 50 �� ǡ��͡Ẻ�ѧ��ԭ ��á��͡��ú��ӹǹ��ͧ��

1.3��͡��ҧẺ��Ш�( Purposive sampling ) �繡��͡��ҧ�¾Ԩ�óҨҡ��õѴ�Թ㨢ͧ��Ԩ��ͧ �ѡɳТͧ��͡��仵��ѵ�ػ��ʧ��ͧ��Ԩ�� ͡��ҧẺ��Ш��ͧ��¤��ͺ�� ӹҭ��л��ʺ��ó��ͧ��ͧ��Ԩ�� ͡��ҧẺ��ժ��¡�ա��ҧ�� Judgement sampling

2. ��ҧ��Ҩ��( Probability sampling )

�繡��ҧ��ö��˹��͡�ʷ��˹��µ��ҧ��˹��¶١��͡ ��Һ��Ҩ��繷��˹��㹻�Ъҡèж١��͡ ��͡��ҧẺ��ö�Ӽŷ��ҧ�ԧ��ѧ��Ъҡ�� ö��Ẻ �ѧ��

2.1 ��ҧẺ�� (Simple random sampling) �繡��ҧ�¶��ҷء�˹��ͷء��Ҫԡ㹻�Ъҡ��͡�ʨж١��͡��ѹ ��Ըչ��е�ͧ��ª��ͻ�Ъҡ÷��ա��Ţ�ӡѺ �Ըա��Ҩ��Ըա�èѺ��ҡ�·��ª��ͻ�Ъҡ÷�� ҧ�Ţ��Ţ�ӡѺ˹��ª��ͷ��ͧ��Ъҡ�

2.2��ҧẺ��к� ( Systematic sampling) �繡��ҧ��ª��ͧ͢�ء˹��»�Ъҡ��§��к��ѭ��¡�� 觻�Ъҡ��͡�繪�ǧ��ҡѹ�Ҩ��ǧ�ҡ�Ѵ��ǹ�ͧ��Ҵ��ҧ��л�Ъҡ� ��Ъҡ�˹��á ��ǹ˹��µ��仹Ѻ�ҡ��ǧ�Ѵ��ǹ��ӹǳ��

2.3��ҧẺ�� (Stratified sampling) �繡��ҧ��¡��Ъҡ��͡�繡��Ъҡ�� 繪��ԡ�͹ ��˹��»�Ъҡ��Ъ��Ԩ��ѡɳ��͹�ѹ (homogenious) ��ҧ��ӹǹ��ҧ��Ѵ��ǹ�ͧ��Ҵ��ҧ��С��Ъҡ�

2.4��ҧẺ�� (Cluster sampling ) �繡��ҧ��觻�Ъҡ�

�͡��鹷��繵�ͧ�Ӻѭ��ª��ͧ͢��Ъҡ� ��ҧ��Ъҡèҡ��鹷��ѧ��ǵ��ӹǹ��ͧ�� ֡�ҷء˹��»�Ъҡ�㹡��鹷�� ͨзӡ��ӴѺ��ҡ��