I am trying to estimate (fit) the distribution of a variable. The first step in doing so is to draw a normal probability plot. This is what I have obtained (using R):
This is the histogram of the data:
As you can see, there is a quadratic pattern in the normal probability plot, but most point fall ABOVE the reference line. The end purpose for this analysis is to detect outliers. Estimating the distribution of this variable would allow me to determine the threshold to set to determine outliers.
What can we deduce from both the normality plot and the histogram, in terms of the distribution of x, and the outliers?