I created a line graph which shows the trend of each subject. I used chart builder function to do so.
I have around 70 subjects and on the graph each subject has been shown with a colour. There are many colours on the graph now that is confusing.
I would like to have them all in black then make some of them red and some blue (based on their slopes). However, I tried so hard and almost every option possible but still not able to do so. Here is the issue:
Since SPSS has limited number of colours, for my 70 subjects, some of them are in similar colour. For example, ID# 3, 20, and 45 are all blue. When I want to change ID#20 to red, automatically, IDs# 3 and 45 will become red as well.
I highly appreciate your help and suggestions.