測試有序組的趨勢

Question

如何測試有序組的趨勢。 我正在使用prop.trend.test但它沒有按組排列，也沒有給出sum of ranks和z value的預期輸出...我正在使用此命令prop.trend.test (birthweight2$lbw2 ,birthweight2$gestwkgp )

我有這個數據集

lbw2          gestwkgp  
normal birth weight 3
normal birth weight 3
normal birth weight 3
normal birth weight 4
normal birth weight 3
normal birth weight 3
normal birth weight 3
normal birth weight 4
low birth weight    2
normal birth weight 4
normal birth weight 4
normal birth weight 3
normal birth weight 4
normal birth weight 3
normal birth weight 3
normal birth weight 3
normal birth weight 2
normal birth weight 3
normal birth weight 3
normal birth weight 3
normal birth weight 3
normal birth weight 4
normal birth weight 3
normal birth weight 4
normal birth weight 4
normal birth weight 3
normal birth weight 3
normal birth weight 3
low birth weight    3
low birth weight    3
normal birth weight 3
normal birth weight 3
normal birth weight 3
low birth weight    1
normal birth weight 3
normal birth weight 4
normal birth weight 3
normal birth weight 4
normal birth weight 3
normal birth weight 3
normal birth weight 4
normal birth weight 3
low birth weight    1
normal birth weight 3
normal birth weight 3
normal birth weight 3
normal birth weight 3
normal birth weight 4
normal birth weight 3
normal birth weight 4
normal birth weight 3
normal birth weight 3
normal birth weight 3
normal birth weight 3
normal birth weight 3
normal birth weight 4
normal birth weight 3
normal birth weight 3
normal birth weight 3
normal birth weight 2
normal birth weight 3
low birth weight    2
normal birth weight 3
low birth weight    2
low birth weight    2
normal birth weight 4
normal birth weight 2
normal birth weight 3
low birth weight    1
normal birth weight 3
normal birth weight 3
low birth weight    1
normal birth weight 3
normal birth weight 3
normal birth weight 3
normal birth weight 3
low birth weight    2
normal birth weight 4
low birth weight    2
normal birth weight 3
normal birth weight 3
normal birth weight 3
normal birth weight 2
normal birth weight 3
normal birth weight 3
low birth weight    1
normal birth weight 4
normal birth weight 3
normal birth weight 3
normal birth weight 3
normal birth weight 3
normal birth weight 2
normal birth weight 3
normal birth weight 3
normal birth weight 2
normal birth weight 3
normal birth weight 3
normal birth weight 3
normal birth weight 3
normal birth weight 3
normal birth weight 3
normal birth weight 3
normal birth weight 3
normal birth weight 3
normal birth weight 4

Answer 1

我認為這不是prop.trend.test的工作方式。 您需要一個附加的限定符，用於將數據分類到之前/之后的場景中。 然后，您想看看這兩種情況下的低體重/正常體重之間是否有任何區別。 考慮將問題表述為2x2列聯表，其中列是之前/之后，行是權重類別。

                 BEFORE    AFTER
low-weigh         freq     freq
normal-weight     freq     freq

這樣，問題就變成了處理方式是否會對權重產生影響，因此該函數的語法將變為：

 prop.trend.test(c(low-weight-after, normal-weight-after),c(rowSums(contingency_table) ))