I have the data for organic matter from two sources i.e. from field and lab. I want to see how close the data from two sources is by fitting two lines across the datasets from the two sources. I was thinking of plotting a scatterplot for the data from field and lab and color the data points with two different colors depending on the source. Could you please suggest how to plot such data?
I just plotted one variable on y axis and don't know how to add another variable on y axis and color the data points.