I am from the life sciences field (neuroscience research) and I am reading a journal paper about the formation of dendritic spines. In their experiments, they count the number of protrusions along dendrites and compare them across the different experimental conditions.
In one of the figures of this journal paper, they show some cumulative probability distribution graphs:
I have read online that with a cumulative probability plot, one can read off the probability of being above or below a particular value, or of being within, or outside, a particular range. However, I am having some trouble interpreting these graphs (Figures C and F) in the context of the paper.
For Figure C, would I be correct in saying that the probability of having greater than 20 protrusions/50 μm of dendrite is greater in the Insulin group compared to the Vehicle group? This is because in the Insulin group, you have a ~60% probability that you will have greater than 20 protrusions/50 μm of dendrite. Whereas in the Vehicle group, you have a ~20% probability that you will have greater than 20 protrusions/50 μm of dendrite.
I am also wondering, given raw data how do people make these cumulative probability distribution plots, and what value can they give to the reader? Any advice is appreciated.