I am new to these formulas and still learning to write them and was wondering how to have an up/down boolean formula to flash up or down  based on the change(+ or -) in moving linear regression slope over a certain time. (ie. 75 and 100 for a five-minute period)..  I tried using the rate of change on the MLR but would like to simplify it further to determine when the slope changes positive or negative. Thanks.