我想要將特定日期的天數與變量Id
一起作爲「中斷變量」,並將結果作爲新的柱。我希望結果類似於數據幀RESULT
中的結果。計算特定日期的ID作爲「中斷變量」
我正在收集有關患者進展的數據(Variable_x
),我想在混合模型中使用「天數」變量作爲時間變量。
下面是變量:
Id <- c(1,1,1,1,2,2,2,5,5,5,5,5)
Date <- as.Date (c("2015-01-01", "2015-01-10", "2015-01-15","2015-01-25","2013-02-01", "2013-03-20", "2013-04-03","2014-05-06","2014-06-07","2014-06-08","2014-08-09","2014-10-10"))
Variable_x <- c("70","NA","55", "30", "70", "60", "NA", "80", "60", "70", "50","20")
Days <- c(0,9,14,24,0,47,61,0,32,33,95,157)
下面是數據我有:
DATA <- data.frame(Id, Date, Variable_x)
這裏是我想要的數據:
RESULT <- data.frame(Id, Date, Days, Variable_x)
希望有人能想出答案或指向正確的方向。
幫助將不勝感激。