constant slope of an indicator

• 02/21/2021 at 2:18 PM #162190
  gnellas77

  hi there, i want to extend a previous question of mine,

  i want to screen stocks that their bollinger bandwidth indicator has a constant slope for the last 10 days lets say. Actually it would look like an almost straight horizontal line with small fluctuations. the following algorithm i received it is valid but returns the bollinger bandwidth indicator as an almost straight line but for some stocks it returns it with an upward slope:

  bollinger bandwidth slope

  Periods = 10 Bol = BollingerBandWidth[20](close)-BollingerBandWidth[20](close)[1] Cond = summation[Periods]((Bol >= 0) AND (Bol <= 0.01)) = Periods SCREENER[Cond]

  1 2 3 4 5

  Periods = 10 Bol   = BollingerBandWidth[20](close)-BollingerBandWidth[20](close)[1] Cond    = summation[Periods]((Bol >= 0) AND (Bol <= 0.01)) = Periods   SCREENER[Cond]

  in order to have an almost horizontal line of the bollinger bandwidth indicator for the last 10 days i thought to use the dy/dx formula that gives the slope of a line. for the y-values i use the bollinger bandwidth values and for the x-values i thought to use past days with the help of “day” or “days” command. Assuming that Bol is the dy how can i write the dx formula (in order for the Bol to be divided by 1, Bol[2] to be divided by 2 and so on…

  thank you.

  

  gnellas77

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  02/22/2021 at 9:41 AM #162310
  Nicolas

  a “flat” line is purely visual. In your indicator you are measuring the variation in points, which can be very different from an intrusment to another!

  You should use the BB% indicator which is the percentage of the price minus the lower band divived by the bands difference, so it is somehow ‘universal’ for all instruments.

   

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  gnellas77

  

  Nicolas

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