The first thing you see in SERP Analyzer is the main chart with "words" factor selected on the sidebar.
The chart shows you correlation between position in SERP (x-axis) and ranking factor. You can turn on factors on the sidebar to make them visible on the graph.
Some factors you may include in your analysis are:
Number of referring domains
Number of referring URLs
Number of words in body
Exact keyword density in body
Partial keywords density in body
Number od characters in title
Partial keywords count in title
Exact keywords in alt desciptions
Number of paragraphs
Page loading times
Number of images