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Cross Validated : Recent Questions and Answers (Page 26)

Find answers to your questions about Cross Validated or help others by answering their Cross Validated questions.

Estimating the blockchain mining time for $N$ nodes

I am trying to simulate a set of times for the below problem. There are N nodes. Each node generates a random number($R$) in the range $[0,K]$ per...

Asked on 12/03/2021 by SlowMountain

2 answer

GLMM indicates a negative trend, graph shows a positive trend

I'm analyzing my data in R using a GLMM, of the format: glmer(y~x1+x2+x3+x4+(1|site),data=df,family=poisson) This produces a negative trend for variable x3. On the other hand, the graph of this result...

Asked on 12/03/2021

2 answer

Question on solution to a typical stochastic process - interview question

What is the solution to the following SDE $$ dX_t = X_t^2 dt + sigma dW_t$$ where $X_t$ is the random variable;$W_t$...

Asked on 12/01/2021

0 answer

Proving a hypothesis test is not a UMP test

Let $X_1,...,X_n$~ $n(theta,sigma_0^2)$, where $sigma_0^2$ is known. Given the hypothesis $H_0: theta = theta_0$ vs $H_1: theta neq theta_0$, I know that a LRT has rejection regionbegin{equation}lvert bar{X}...

Asked on 12/01/2021 by harisf

1 answer

Cluster analysis considering uncertainty

Does anyone know how to do cluster analysis that considers the uncertainty (s.e. or confidence intervals in the data?)I want to do cluster analysis on group estimates state-level and...

Asked on 12/01/2021 by Estela

1 answer

Causal estimates have high correlation with naive estimates - what may this imply?

In an observational study, suppose that individuals can choose from $N$ different treatments, and there are the same confounders for each treatment and the outcome. The naive probability, $frac{text{successful outcomes}_i}{text{cases...

Asked on 12/01/2021 by Cam.Davidson.Pilon

2 answer

How to inform the space and time complexity of K-means, SOM and Hierachical clustering

In the paper I am writing, one of the reviewers asked for an "a simple computational complexity analysis or time computational demands of their method"My question is : Can I...

Asked on 12/01/2021

1 answer

In SARSA and Q-learning algorithms in RL, is policy updated during the iteration for Q-value learning?

In the video by Prof Brunskill "Stanford CS234 winter 2019 lecture 4" for model-free control (https://www.youtube.com/watch?v=j080VBVGkfQ), at 57:49/1:17:45, the pseudo code for SARSA includes line 8 for...

Asked on 12/01/2021 by Ruye

1 answer

Mathematical explanation for this relationship

I have analyzed some data, and noticed that it fits this relationship quite well: $$P(A|Bcap C) = P(A|B)frac{P(A|C)}{P(A)}$$ I am wondering what the interpretation of this would be mathematically,...

Asked on 12/01/2021 by Azmisov

0 answer

Definition of a support vector (SVM)

I have a question regarding the definition of support vectors. It is usually stated that support vectors are those vectors which lie...

Asked on 12/01/2021 by Confucius

1 answer

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