地板效應英文floor effect)指想量度嗰啲數值低得滯,搞到件量度架生唔再俾到有用嘅資訊[1]

舉個簡化嘅例子,想像家陣攞支日常嘅溫度計,條計最低淨係度到 -20 °C 嘅氣溫,條計就應該唔會有能力分辨一嚿 -100°C 嘅物體同一嚿 -120°C 嘅物體-

  • 攞條計去度一嚿 -100°C 嘅物體,條計出最低數值,
  • 跟住攞條計去度一嚿 -120°C 嘅物體,條計都係出最低數值。

噉即係話,雖然兩嚿低溫物體溫度唔同,但條溫度計對兩嚿物體都係俾一樣嘅反應(出最低數值)-做唔到分辨兩者(俾唔到有用嘅資訊)。

睇埋

編輯
  1. Lim, Christopher R.; Harris, Kristina; Dawson, Jill; Beard, David J.; Fitzpatrick, Ray; Price, Andrew J. (2015-07-01). "Floor and ceiling effects in the OHS: an analysis of the NHS PROMs data set". BMJ Open. 5 (7): e007765.