After "Supervised Learning on Stock Prediction - Labeling Stock Data", would you please come up with a different definition of "A Good Day for Buying Shares" than the ones I mentioned in the video?

Grading Rubrics:

1) your proposed definition is different than the ones I discussed in my lecture (a definition will be judged as the same if just percentage of increase/decrease is different than mine). 5 points

2) your proposed definition makes sense 3-5 points 3: reasonable; 4: good, 5: super (in order to get the points for 2), you need to first get points for 1); in other words, copy any of my definition leads to 0 score in this discussion)