I have this code for price percentage change:

Pricechange=(C-Ref(C,-1))*100/Ref(C,-1);

Now i want to set a sell signal that will generate the signal if price falls 
for more than 4%

Normally it can be done as Sell= -Pricechange>4;

but this code looks into one particular bar to meet the condition but i want if 
cumulative price fall on some consecutive days is more than 4% then also it 
will generate the signal.

For better understanding suppose after few days of buy occur, price on 4th day 
price falls 1%,2nd
How could it be done?

Suppose my buy is Buy= pricechange>5 and V>wma(v,15);

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