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Cross Validated : Recent Questions and Answers (Page 35)

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

How to predict unknown time series in using Facebook Prophet?

The problem is predicting hits on different stories published on a website. I am aware that for this kind of time series forecasting, facebook prophet is a popular library. However,...

Asked on 11/20/2021

0 answer

Choosing the right model for prediction

Given a set of temperatures of different cities for a month, which prediction model should I use for a two day look ahead prediction? Regression models or Time series?...

Asked on 11/18/2021

1 answer

Relation between P-value in a randomness test, number of samples, and entropy

Consider tests of randomness of bit sequences of fixed size $n$ bits as in cryptography (e.g. NIST Special Publication 800-22 page 1-4; notice this uses captital-$P$ for...

Asked on 11/18/2021

1 answer

Is there a way to use cor function with factor variables without creating dummy variables? (R)

I have a dataset with several categorical predictors with varying factor levels. Is there a way to generate a correlation matrix from this data without having to create a bunch...

Asked on 11/18/2021 by Charles Orlando

1 answer

What's the intuition behind contrastive learning or approach?

Maybe a noobs query, but recently I have seen a surge of papers w.r.t contrastive learning (a subset of semi-supervised learning). Some of the prominent and recent research papers which...

Asked on 11/18/2021

2 answer

What is the difference between econometrics and statistics?

It's never been very clear to me what distinguishes econometrics from statistics. My preliminary understanding was that statistics is data-focused whereas econometrics always starts from theory. But is that it?...

Asked on 11/18/2021

6 answer

Central limit theorem - num random variables vs. sample size?

Does the Central Limit Theorem require the number of random variables to increase to a sufficiently large number or the number of samples of each random variable to increase to...

Asked on 11/18/2021 by imagineerThat

1 answer

How to smooth an existing PDF?

I've generated a PDF of binned data using the python package binsmooth. The PDF is plotted in the following image: I am trying to smooth...

Asked on 11/18/2021 by crimson_idiot

1 answer

Finding variance and mean of an expression?

I want to compute the expectation and variance of the following expression.$ Z|H_{i}=(|h_{i}|^{2}|s[n]|^{2}+|w[n]|^{2}+2mathcal{R}(h_{i}s[n]w^{*}[n]))$where,$s[n]$ is PSK signal and $h$ is rayleigh distributed and $w[n]$ is...

Asked on 11/18/2021

0 answer

One-sample t-test on count data

I’m working with sports performance data (ice hockey). The question I’m trying to answer is: Does the number of duels player A won in a specific match differ significantly from...

Asked on 11/16/2021 by Zarya

0 answer

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