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Weigted Average

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... Read moreหลายคนเจอคำว่า “สูตร weighted average ใน excel” แล้วงงว่าต้องเริ่มยังไง เราสรุปวิธีที่ทำบ่อยในงานให้แบบจับมือทำเลย (ใช้ได้ทั้งคะแนน-เปอร์เซ็นต์, ราคาถัวเฉลี่ย, KPI ตามน้ำหนัก ฯลฯ) 1) โครงสร้างตารางที่ทำให้ง่ายสุด - คอลัมน์ “คะแนน/ค่า” (เช่น D8:D10) - คอลัมน์ “น้ำหนักเป็น %” (เช่น E8:E10) ใส่เป็นเปอร์เซ็นต์ เช่น 20%, 30%, 50% 2) วิธีที่ 1: คูณทีละแถวแล้วค่อยรวม - ทำคอลัมน์ช่วย “คะแนน x %” (เช่น G8) ใส่สูตร: =D8*E8 - คัดลอกสูตรลงไปทั้งช่วง - รวมคะแนนถ่วงน้ำหนัก: =SUM(G8:G10)/SUM(E8:E10) ข้อดีคือเห็นทีละแถวชัดมาก เหมาะกับคนอยากตรวจทีละบรรทัด 3) วิธีที่ 2 (แนะนำ): ใช้ SUMPRODUCT จบในบรรทัดเดียว สูตรยอดฮิตคือ: =SUMPRODUCT(D8:D10,E8:E10)/SUM(E8:E10) แนวคิดคือ SUMPRODUCT จะเอาคะแนนคูณน้ำหนักทุกแถวแล้วบวกให้ทันที จากนั้นหารด้วยผลรวมน้ำหนักอีกที เพื่อกันกรณีเปอร์เซ็นต์ไม่ได้รวมเป็น 100% 4) เช็กเปอร์เซ็นต์รวมให้ชัวร์ (กันค่าผิดแบบไม่รู้ตัว) ใส่ช่องตรวจสอบไว้เลย: =SUM(E8:E10) โดยปกติควรได้ 100% (หรือ 1 ถ้าคุณพิมพ์น้ำหนักเป็นทศนิยม 0.2, 0.3, 0.5) ถ้าไม่ครบ 100% ผลลัพธ์อาจเพี้ยน โดยเฉพาะเวลาลืมแถวใดแถวหนึ่ง 5) ทิปเล็กๆ ที่ช่วยลดพลาด - ล็อกช่วงด้วย $ ถ้าจะลากสูตรข้ามตาราง เช่น =SUMPRODUCT($D$8:$D$10,$E$8:$E$10)/SUM($E$8:$E$10) - ถ้าน้ำหนักเป็นตัวเลข 20,30,50 (ไม่ใช่ %) ให้หาร 100 ก่อน หรือแปลงเป็น % แล้วค่อยคำนวณ เสริมสำหรับคนที่ค้นหา “สูตรคำนวณ BMI ใน Excel” ถ้าคุณทำชีตสุขภาพคู่กัน สามารถคำนวณ BMI ได้ด้วยสูตรพื้นฐาน: BMI = น้ำหนัก(กก.) / (ส่วนสูง(ม.)^2) ตัวอย่าง น้ำหนักอยู่ B2 (กก.) ส่วนสูงอยู่ C2 (ซม.) ใช้: =B2/POWER(C2/100,2) แล้วค่อยนำ BMI หลายครั้งมาหาค่าเฉลี่ยถ่วงน้ำหนักได้ เช่น ถ่วงตามจำนวนวัน/จำนวนครั้งที่วัด ด้วยสูตร SUMPRODUCT แบบเดียวกันข้างบน

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