[R] Produce multiple line graphs
JSorkin at grecc.umaryland.edu
Mon Sep 26 03:43:16 CEST 2016
I have a data frame that contains data for multiple (seven) subjects. Each subject is represented by a new value of PID.
I would like to plot the data for all seven subjects. For each subject I want to plot a line showing CT as a function of Nit, with the dots for each subject joined. I have tried to accomplish this using the by function. I get an error message,
Error in match.fun(panel) :
'xx[, "CT"]' is not a function, character or symbol
I have no idea what is causing the error, nor how to correct the error, nor how to get the dots for each point be connected by a line.
Any help would be appreciated!
PID <- c( 1 , 1 , 1 , 1 , 2, 2, 2, 2, 3 , 3 , 3 , 3 , 4 , 4, 4, 4 , 5, 5, 5, 5, 6, 6, 6, 6, 7 , 7 , 7 , 7)
Nit <- c(NA , -9.23,-11.61,-7.88,NA,NA,NA,NA,-5.59, 0.73,-10.55, -9.13, 3.67, NA, NA,-13.26,NA,NA,NA,NA,NA,NA,NA,NA,-9.36, 5.08, -5.73, 2.02)
CT <- c(544,459 ,432 ,NA ,NA,NA,NA,NA,1398 ,1287 ,1049 , NA ,543 ,474,507,NA ,NA,NA,NA,NA,NA,NA,NA,NA,992 ,992 ,1078 ,NA)
xx <- data.frame(PID=PID,Nit=Nit,CT=CT)
John David Sorkin M.D., Ph.D.
Professor of Medicine
Chief, Biostatistics and Informatics
University of Maryland School of Medicine Division of Gerontology and Geriatric Medicine
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