Thanks so much. I was able to get the answer with your help. Now I have the right plot, 19 points for each plot would be correct. The important thing is that the initial plot showed me a much lower point than I expected; it doesn't matter is it 19 or is it 20, because I have several datasets, and one of them is 19 which shows here.
my aim was to figure out why show me a much lower point in my second approach
I had two approaches in my initial comments:
In my first way: I tried using the jitter option with a scatter statement alongside a vertical bar chart. but, I received an error stating 'overlay incompatible plot,' .
In my second approach, I missed to include the jitter option, which resolved the issue, so it would be enough to include “markerattrs=(color=gray size=6 symbol=trianglefilled)jitter” as a last line in my second approach
... View more