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Traders Joking

This is a discussion on Traders Joking within the Traders Joking forums, part of the Non-Related Discussion category; Elephant in the room...

      
   
  1. #581
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    Elephant in the room

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  2. #582
    member mql5's Avatar
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    Two forex trading newbies talking with each other

    Two traders are talking (taken from this mql5 thread):

    Consider a linear regression model xi = a + b * i + ei in time i = 1, 2, ..., n, where the errors ei are white noise with the Laplace distribution. The error density then has the form p (x, c) = 0.5 * c * exp (-c * | x |), log (p (x, c)) = log (0.5) + log (c) -c * | x |

    The likelihood function for the noise will have the form L = p (d1, c) * p (d2, c) * ... * p (dn, c), where di = xi-ab * i are the residuals of the model. Logarithm of the likelihood function LL = n * log (0.5) + n * log (c) -c * S, where S = | d1 | + | d2 | + ... + | dn |. S does not depend on the parameter c, therefore the problem of maximizing LL is solved in two stages
    and it is the reply:

    This is all true. The question is what exactly to take for the sliding between the two rows. For example, there is a traditional opinion that the length of the perpendicular to the regression line. But it seems to me that this is not quite the right way. For it gives a separation not relative to the previous values, but relative to a certain midpoint of them. Such a substance as the "asymmetry" of the opening is lost, and I would like to feel it.
    And what do you think?
    • minimization of S (since c> 0) with respect to a and b ?
      or
    • maximization of LL with respect to the parameter c, with the found value of S ?
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  3. #583
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    Quote Originally Posted by mql5 View Post
    Two traders are talking (taken from this mql5 thread):

    Consider a linear regression model xi = a + b * i + ei in time i = 1, 2, ..., n, where the errors ei are white noise with the Laplace distribution. The error density then has the form p (x, c) = 0.5 * c * exp (-c * | x |), log (p (x, c)) = log (0.5) + log (c) -c * | x |

    The likelihood function for the noise will have the form L = p (d1, c) * p (d2, c) * ... * p (dn, c), where di = xi-ab * i are the residuals of the model. Logarithm of the likelihood function LL = n * log (0.5) + n * log (c) -c * S, where S = | d1 | + | d2 | + ... + | dn |. S does not depend on the parameter c, therefore the problem of maximizing LL is solved in two stages
    and it is the reply:

    This is all true. The question is what exactly to take for the sliding between the two rows. For example, there is a traditional opinion that the length of the perpendicular to the regression line. But it seems to me that this is not quite the right way. For it gives a separation not relative to the previous values, but relative to a certain midpoint of them. Such a substance as the "asymmetry" of the opening is lost, and I would like to feel it.
    And what do you think?
    • minimization of S (since c> 0) with respect to a and b ?
      or
    • maximization of LL with respect to the parameter c, with the found value of S ?
    I am impressed with your knowledge. So, according to your explanation - it is possible to make money on Forex, right?
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  4. #584
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    Tang Tawanwad photo

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    more..
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  5. #585
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    TITANIC - the new version

    TITANIC - the new version

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  6. #586
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    sleepy

    Sleepy for weekend

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    The friends

    Two friends

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    sleeping

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  9. #589
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    THE TOYS - อาหมวยหาย (阿妹走) [Official MV]

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