I'm not in Statistics field. I conducted the case study and collected the data as shown below I have data as shown in the table below:
I would like to find correlation coefficient from this two table data(between NOA and HVOC, and between NOA and HVOL). I conducted the case study with the source code.
I measured software metrics named "NOA" and "HVOL" for all the method/function before I modified this source code. And then, after I modified the code, I again measureed the same metrics for all the method.
NOA Diff field in the table is calculated from NOA (after modifying the code) minus NOA (before modifying the code). That is "NOA Diff = NOA(after)-NOA(before)". The same way was applied to HVOC metric; HVOC Diff = HVOC(after)-HVOC(before)
My questions are
- What type of correlation coefficient should I use?
- What kind of graph should I create to illustrate my data?
- The table above is all data, i mean it's population not a sample, can I use the method that is used with a sample
- Is Spearman is for non normally distributed data?