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Cross Validated : Recent Questions and Answers (Page 15)

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

Statistics book recommendation for absolute beginners and non-mathematics people

Based on this this and this, but also looking for following specificationsFor absolute beginners level, and easy type book.Easy to read (Less text, larger fonts).Not mathematically...

Asked on 12/18/2021

2 answer

Likelihood as a test statistic in a hypothesis test

Suppose I have two samples $S_1,S_2$ of categorical data, and I'd like to design a hypothesis test to check the null hypothesis that they are both iid samples from...

Asked on 12/18/2021

0 answer

How to generate time series with a predefined auto correlation and cross-correlation among the series

I want to generated $N$ time series, each with length of $N_t$, i.e., I am considering $N_t$ time instants. The generated time series must have an auto...

Asked on 12/18/2021

0 answer

When to preprocess data for neural network

In https://cs231n.github.io/neural-networks-2/, the authors say that preprocessing should only be done on the training set, and then the mean, variance, etc. of the training set should be...

Asked on 12/18/2021

1 answer

Aggregation Estimation Issues

I'm analyzing the effect of a law enforcement measure over time on reported violence for districts in a city. If I consider the city as a whole I have access...

Asked on 12/18/2021 by cel

1 answer

Can I see Log-likelihood values for two-step clustering in SPSS?

I need to compare Two-step clustering with latent class analysis. As LCA is not possible in SPSS I did it in R, however, 2-step clustering in R is quite challenging,...

Asked on 12/18/2021 by Yauheniya Volchok

1 answer

Why do people use tanh more often than ReLU in vanilla recurrent neural networks?

For instance, the default activation function of tf.keras.layers.SimpleRNN is tanh.My doubt is because tanh activation functions may also cause (like sigmoids) the vanishing gradient problem....

Asked on 12/18/2021

0 answer

Why does forward selection only take $O(p^2)$ calls to the learning algorithm?

In http://cs229.stanford.edu/notes/cs229-notes-all/cs229-notes5.pdf pg 5, it states that forward search takes $O(p^2)$ (note the notes uses $n$ instead of $p$ for the number if independent...

Asked on 12/18/2021

1 answer

Simulate a variable based on a known correlation and distribution

I have a normally distributed variable (var2) with a mean of 10 and sd of 3:mean <- 10sd <- 3 var2 <- rnorm(n = 1000, mean...

Asked on 12/15/2021

0 answer

Intuition Behind binomial (logistic) GLM

This is a question regarding using logistic regression, and relating it to gaussian distribution or a binomial distribution.model <- glm(target ~ x1, data=data, type='response', family='binomial')model <- glm(target ~ x1,...

Asked on 12/15/2021

2 answer

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