Utopi
a

heterogeneity

  • More on means, less on dispersion

    • i2i^2 =50% 不能区别坡度
  • 置信区间不能反应分散的取向,而是准确度。

    • Predict interval: Mean ±\pm 2x std Dev 是唯一能知道 effect vary
  • Does effect vary at all?p valueHow much it cost -> more than 0
    What proportion is real?i2i^2I will get 70% discount
    How much does effect vary?Prediction intervalhow much will I pay
  • Role of heterogeneity in meta-analysis:

    • Narrow case v.s Wide case
    • must study with means

terminology

I-Squared: From Calculation to Concept

: a measure of heterogeneity of results across studies