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## Self-Replicating ProgramsNot sure if this has any practical applications, other than to write a virus. But I am just curious about it. Have you ever written a progr… Started by Decision Science in Data Mining SoftwareLatest Reply |

## Yet Another Interesting Math Problem - The Collatz ConjectureTake any positive integer n. If n is even, divide it by 2 to get n / 2. If n is odd, multiply it by 3 and add 1 to obtain 3n + 1. Repeat th… Started by Decision Science in Data Mining SoftwareLatest Reply |

## My interview on my non-Markovian approach to modeling energy/commodity markets at Global Derivatives 2016Dear Colleagues, I would like to let you know that I was invited to give an Interview on my Non-Markovian approach to modeling Commodity m… Started by Valery A. Kholodnyi in QuantLatest Reply |

## Hiking ChallengeThis question may look like a job interview question for a software engineering position, but the problem, as well as the solution, is very… Started by Vincent Granville in Data Mining SoftwareLatest Reply |

## Help on learning Business AnalyticsHi, I am a MBA with 10 years experience primarily in consulting and strategy. My last stint for my company was in BI and descriptive analyt… Started by Varun Rajwade in Careers and ConsultingLatest Reply |

## Challenge: Representation of Numbers as Infinite ProductsThis is our new challenge of the week. Previous challenges can be found here. While infinite products are equivalent to infinite sums when… Started by Vincent Granville in Data Mining SoftwareLatest Reply |

## Logistic Regression: why KS drop a lot after 2 months?Dear all , After I set up a logistic regression ,KS =43, but after 2 months, when i tested the new population , KS = 31, what will be the… Started by FRANK in Data Mining SoftwareLatest Reply |

## Interesting Math Brain TeaserWe see them all the times, some companies are still using them to hire people - a bad idea in my opinion. Anyway I've found this one posted… Started by Vincent Granville in Data Mining SoftwareLatest Reply |

## Can you explain this mathematical paradox?The formula e^{Pi * i) = -1 (see picture below) has been deemed one of the most beautiful mathematical equations, see for example a Quora d… Started by Vincent Granville in Data Mining SoftwareLatest Reply |

## Market Mix Models : Confidence in coefficientsIn market mix models, my sales(y) depends on 4 promotions(p1--p4). Let (b11, b21, b31, b41 ) be the coefficients of p1--p4 in one iteration… Started by Raghu Chittari in Business AnalyticsLatest Reply |

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