This is the best video that explain my questions several months ago. And there was no Key word for me to search anywhere. You made my day mate. Keep up the good work! Don't give up on the RU-vid Channel!!!!
Not yet. It's a lil complicated. I'd also need to cover Kuder-Richardson Formula 20 which is not mentioned in the video. It might take a bit for me to get back to production! Hope to some day soon.