Scan for Moving Average Slope Change

WillyG

New member
To set the stage, this is my first post on usethinkscript.com. I have not written a study with thinkscript but have made some simple modifications to several studies that I use. I use Martin Begley's moving average study that changes color as the slope of the moving average changes (see his code below). I am trying to write the script to create a scan to identify stocks where their 50 day moving average has changed from sloping downward (yesterday) to sloping upward (today). Following are my attempts to create this scan. First, I used the Thinkorswim Condition Wizard and came up with the following code which did not work:

SimpleMovingAvg("length" = 50) is greater than SimpleMovingAvg("length" = 50) from -1 bars ago

So, I tried to hand-write the code below and, unfortunately, it did not work either. I would very much appreciate someone's help! Thank you in advance!!!

input length = 50;
input price = close;
input AverageType = SimpleMovingAvg;
def MA = SimpleMovingAvg;
plot MA > MA[1];

##############################################
# Calculate and Plot Moving Average With Colors
# by Martin Begley
###############################################
input length = 50;
input price = close;
input AverageType = {Default Simple, Exponential, Weighted, Wilders, Hull};
def average;
switch (AverageType) {
case Simple:
average = Average(price, length);
case Exponential:
average = ExpAverage(price, length);
case Weighted:
average = wma(price, length);
case Wilders:
average = WildersAverage(price, length);
case Hull:
average = HullMovingAvg(price, length);
}
plot MA = average;
MA.SetPaintingStrategy(PaintingStrategy.LINE_VS_POINTS);
MA.SetLineWeight(2);
MA.DefineColor("Up", Color.DARK_GREEN);
MA.DefineColor("Down", Color.RED);
MA.DefineColor("Flat", Color.GRAY);
MA.AssignValueColor(if MA[0] > MA[1] then MA.Color("Up") else if MA[0] <
MA[1] then MA.Color("Down") else MA.Color("Flat"));
 
I made a small modification to my effort above by changing the "input" code to "def" code, but the code still does not give me the information I'm looking for.

def average = SimpleMovingAvg(close, 50);
def MA = average;
plot scan = MA[0] > MA[1];
 
That's it!!! Thank you so much!!!
So would this work for a scanner:

input length = 50;
input price = close;
def AverageType = movavgExponential;
def MA = movavgExponential;
plot scan = (MA[2] > MA[1] and MA[1] < MA[0]);

It doesn't seem to be working for me. Any help appreciated, thanks!
 
@Andygray8 There are many ways to write this. Here is one example:
Ruby:
def MA = ExpAverage(close, 50);;
plot scan = MA[2] > MA[1] and MA[1] < MA;
vtEv3qV.png
 
@Andygray8 There are many ways to write this. Here is one example:
Ruby:
def MA = ExpAverage(close, 50);;
plot scan = MA[2] > MA[1] and MA[1] < MA;
vtEv3qV.png
Thanks MD I appreciate the quick response! Looks like it's providing good results. While trying to keep it simple, I was pondering ways to make this a little more sophisticated. Like somehow putting in a condition like "is it greater than X bars ago." Not sure how this would work. One workaround would be to just create two different scans where MA2 and MA1 are isolated and flip flopped and just reconcile them against each other with multiple scans to figure out when the slope flips to positive.

Forgive my ramblings thanks for your help!

Andy
 

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