# make a dummy test data.frame with 10 values

df

Dear Marierose,

If I understand you correctly you want R to draw a line graph that does not loose your x axis (i.e. time) values if the y axis value (result of a biomarker) is NA, i.e. missing.

Define the dataframe, then call plot, and when you then use na.omit in lines it will keep all your points on your x-axis.

So for example:

marker

If you want to highlight the connections you made, I kindly suggest using the following modification of the Jochem code

# make a dummy test data.frame with 10 values

df

Removing the missing values means creating an x-axis with only 18 values instead of 24. maybe doing ;

data=data.fram(x=1:24, y=test)

library(ggplot2)

ggplot(data, aes(x,y)+geom_point()+geom_line( data=na.omit(data))

Could hepl ;)