Hi dears, I want to ask a question related to linear regression.
I want to do simple linear regression between the Response variable "GFR" and predictors g1 to g10 considering ZN as a covariate. When I see the result of the list I also saw length difference. Here upload the screenshot for clarity. Why is that happening?
data <- data.frame(B = c("m","m","m","m","m", "m", "f","f","f","f","f"),
G = c("s","s","s","u","u", "u", "k","k","k","r","r"),
ZN =c(78,82,34,67,98,56,37,45,27,18,34),
GFR=c(120,100,90,60,100,110,100,90,95,87,96),
g1 = c(35, 2, 3, 4, 5, 6, 7, 10, 12, 41, 76),
g2 = c(20, 2, 7, 2, 8, 5, 5, 3, 7, 2, 12),
g3 = c(5, 0, 4, 5, 2, 4, 8, 9, 20, 1, 11),
g4 = c(1,3,4,5,7,3,1,5,7,3,10),
g5 = c(20,23, 27, 35, 12, 10, 17, 24, 21, 15, 16),
g6 = c(13,13,115,17,14,12,19,6,7,8,4),
g7 = c(5, 0, 4, 5, 2, 4, 8, 9, 20, 1, 11),
g8 = c(1,3,4,5,7,3,1,5,7,3,10),
g9 = c(20,23, 27, 35, 12, 10, 17, 24, 21, 15, 16),
g10 =c(13,13,115,17,14,12,19,6,7,8,4))
zn1 <- lapply(data[,-c(1,2,4)], function(x) lm(GFR ~ x + ZN, data = data))
zn2 <- lapply(zn1, function(x) summary(x)$coefficients)