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In order to track prices of many different products from different sources, I must optimally schedule a group of trackers dedicated to price collection (ie. collect one price at a...
Asked on 01/14/2021 by doxav
1 answerI want to sample from the geometric distribution for a very small success rate. The success rate is so small that I represent it by its log. I want the...
Asked on 01/14/2021
1 answerFor a simple linear regression model without intercept, that is$$y_i=ax_i+varepsilon_i$$where $varepsilon_isim_{iid} N(0, tau^2), i=1,2,dots, n$ and $x_i$ is a fixed covariate. My question is what...
Asked on 01/14/2021 by user261225
1 answerI need to forecast sales for a data set where I have the amount sold per item and week. There are also categorical variables that are supposed to be integrated...
Asked on 01/13/2021 by Katy
1 answerAn incidence rate (whether an incidence density or an incidence proportion) measures the probability of an event (typically a new case of the relevant health condition in epidemiology) divided by...
Asked on 01/13/2021
0 answerI know this probably has been discussed somewhere else, but I have not been able to find an explicit answer. I am trying to use the formula $R^2 = 1...
Asked on 01/13/2021 by crazydriver
2 answerAre there any standard techniques I can use to denoise a 3D matrix? I hope to apply something like simple SVD denoising methods (e.g., reconstructed the images with salient singular...
Asked on 01/13/2021 by Haohan Wang
0 answerI'm reading Building Intelligent Interactive Tutors (Woolf, 2009) on student models for ITSs. On page 261, the author presents an example for a simple Bayesian network ($S rightarrow E$), where...
Asked on 01/13/2021 by Vin
1 answerDisclosure: I am not a prominent mathematician (current bachelor student) like others on this website and my approach has been mostly pragmatic. Please do tell me if I can improve...
Asked on 01/12/2021 by G.S. Luimstra
0 answerIn Andrew Ng's Machine Learning course lecture 4.6 on "Normal Equation", he says that in order to minimize $J(theta) = frac{1}{2m}sumlimits_{i=1}^{m}({h_{theta}}(x^{(i)}) - y^{(i)})^2$, where $h_{theta}(x)...
Asked on 01/12/2021 by SomethingSomething
1 answerGet help from others!
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