作者marki (marki)
看板Statistics
標題[問題] 想請問probability的問題
時間Thu Aug 20 15:06:30 2020
各位前輩好
小弟想請問在這篇文章的fig 5
pubmed:
https://pubmed.ncbi.nlm.nih.gov/24814497/
全文:
https://www.sciencedirect.com/science/article/pii/S0735109714022189?via%3Dihub
fig 5 連結:
https://www.onlinejacc.org/content/63/25_Part_A/2840/F5
是怎麼畫出來的
我了解這應該是先做出logistic regression模型 然後在算出probability
內文是寫:
....AF burden was significantly associated with the clinical AF
classification and was included in subsequent models investigating
the additional effect of the following variables on the clinical AF
classification: age, sex, presence of coronary artery disease, presence
of cardiomyopathy, functional status (New York Heart Association
functional class), history of ablation for AF, history of heart surgery,
AF density (6,18), and left ventricular ejection fraction (LVEF)....
(p. 2842 左上 Statistical analyses段落)
我的疑問是所以在計算probability的時候,他的age, sex, presence of coronary artery disease等調整變數要放甚麼阿?
是都當作0嗎?
煩請各位先進不吝指教
感謝
--
※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 140.116.253.195 (臺灣)
※ 文章網址: https://webptt.com/m.aspx?n=bbs/Statistics/M.1597907194.A.B83.html
※ 編輯: marki (140.116.253.195 臺灣), 08/20/2020 15:56:43
1F:→ andrew43: 若預先中心化連續自變數,那填0是合理的做法,也就是把 08/20 17:41
2F:→ andrew43: 其它自變數填入其平均的意思。這張圖應該也是忽略其它自 08/20 17:42
3F:→ andrew43: 變數(視為定值)。 08/20 17:44
4F:→ andrew43: 類別自變數的話也可採用特定contrast coding達到此目的 08/20 17:44
5F:→ marki: 可是例如年紀。這個平均值不是0。所以意思是要放平均值嗎? 08/20 22:15
6F:→ marki: 另外是這個method 習慣上是都不會寫嗎? 08/20 22:16
7F:→ clickhere: subsequent model"s". Fig 5 可能只多了LVEF&CAD. 08/21 07:52