สำมะโนธุรกิจและอุตสาหกรรม พ.ศ. 2565 อุตสาหกรรมการผลิต: ภาคเหนือ

71 Appendix B : Estimation of Sampling Error The survey results were presented at regional level namely Bangkok metropolis, Vicinity of Bangkok metropolis ( Samut Prakan, Nonthaburi, Pathum Thani, Nakhon Pathom and Samut Sakhon ) , the Central ( excepted Bangkok metropolis and Vicinity of Bangkok metropolis ) , the North, the Northeast and the South classified by TSIC 2009 at activity level . The sizes of establishment were aggregated from 12 sub - sizes of establishment according to number of persons engaged as follows : Size of establishment 1 2 3 4 5 6 7 8 Number of persons engaged 1 - 5 6 - 10 11 - 15 16 - 25 26 - 30 31 - 50 51 - 200 > 200 Let, q = 1 , 2 , 3 , ... , hijklmp n  ( sample establishment ) p = 1 , 2 , 3 , ... , 12 ( sub - size of establishment ) m = 1 , 2 , 3 , ... , 409 ( activity ) l = 1 , 2 , 3 , ... , 164 ( class ) k = 1 , 2 , 3 , ... , 78 ( group ) j = 1 , 2 , 3 , ... , 28 ( division ) i = 1 , 2 , 3 , ... , h A ( province ) h = 1 , 2 , 3 , 4 , 5 , 6 ( region ) Appendix B : ESTIMATION OF SAMPLING ERROR