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I'm trying to find a rigorous derivation for the backpropagation algorithm, and I've gotten myself into something of a confusion. The confusion comes from when and why people transpose the...
Asked on 12/27/2021
1 answerSay I have a probability of default of 0.02 (which is annual so over next year) for a certain client. Then say this client takes out a 180 day loan,...
Asked on 12/27/2021 by mathella
1 answerHere's my code in R but I unfortunately can't share my data, and I can't reproduce it by randomly creating a data set. I can say that the data...
Asked on 12/25/2021
1 answerLogistic regression with lasso versus PCA?Got asked this question in an interview. I know the main difference is that Lasso is a regularization technique (adding vars to minimize effect of...
Asked on 12/25/2021 by Manas
2 answerI was toying with R to see how the number of variables might affect spurious regression. Suppose that we have an $I(1)$ vector $y$ and a matrix ...
Asked on 12/25/2021 by badmax
1 answerLet's say we have a model mod <- Y ~ X*Condition + (X*Condition|subject)# Y = logit variable # X = continuous variable # Condition = values A...
Asked on 12/25/2021 by User33268
2 answerI am trying very hard (I am not a statistician) to understand the concepts of "groups" and "levels" in mixed effect models. In particular, I am trying to understand this...
Asked on 12/25/2021
1 answerI know that in order to test whether a random effect has a significant impact on a model it's necessary to sequentially remove one random effect at a time and...
Asked on 12/25/2021 by ribelles
1 answerIn class we are told to be very careful when using mixed models and to use the simplest models, to avoid talking nonsense. I posted questions previously about this but...
Asked on 12/25/2021
1 answerI have a linear model with response variable $textbf{y}$ and explanatory variable matrix $textbf{X}$ for which coefficients $textbf{b}$ are physically meaningful and worth estimating: begin{equation}textbf{y}...
Asked on 12/25/2021
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