Analysis and Fitting Linear Regression and Half Life - PYTHON

What do I need to do on this project.

1. Analyze the way I am creating the linear regression.

2. Today I don't use data for training and testing, I would like to implement it to get on the best straight.

3. I need the statistical residual to be analyzed in detail to extract the following detailed information.

3.1 How many times the residual went to the second +2 standard deviation and back to the first +1 standard deviation.

3.2 Reaching the second +2 standard deviation I need to know how many days/average it takes to go to +1 standard deviation.


3.3 How many times the residual went to the second -2 standard deviation and back to the first -1 standard deviation.

3.4 Reaching the second positive standard deviation -2 I need to know how many days/average it takes to go to -1 standard deviation.

3.5 How many times the residual went to the second +2 standard deviation and returned to zero.

3.6 Reaching the second positive standard deviation +2 I need to know how many days/average it takes to go to zero.

3.8 How many times the residual went to the second -2 standard deviation and back to zero.

3.9 Reaching the second positive standard deviation -2 I need to know how many days/average it takes to go to zero.