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Cross Validated : Recent Questions and Answers (Page 38)

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

Normalizing zero inflated predictors for multiple regression

Hope I got it right, as this is my first active post :-)I was trying to find a solution the whole day for my problem. I am trying to...

Asked on 11/14/2021 by Eugen Cuic

0 answer

Should we always calculate the z in a confidence interval as 1 - (alpha/2)?

I'm currently beginning my studies in statistics and all of the examples of confidence interval questions I studied used (let's assume a 95% confidence interval) as a z formula z...

Asked on 11/14/2021

1 answer

What are the contours lines on the Cook's list vs Leverage h_ii / (1-h_ii) plot?

According to the documentation, plot #6 of plot.lm in R: "In the Cook's distance vs leverage/(1-leverage) plot, contours of standardized residuals that are equal in magnitude are lines through...

Asked on 11/14/2021 by user291965

1 answer

How to define and plot a distribution function in python?

I want to define a distribution function (gaussian or skewed,...), the X axis is from 0 to 255. I have the mode which is located at the point 100 and...

Asked on 11/14/2021 by khadoudj

0 answer

Should multivariate time series by normalized in any way before fitting a VAR model?

I have many time series on very different scales; some take on values in the millions, while some are restricted to $[-1,1]$. Should I preprocess them in any way,...

Asked on 11/14/2021 by theQman

0 answer

Sample Size Calculation - Two Independent Means

I am trying to design an email test to measure the demand lift obtained from a marketing promotion (treatment) versus no promotion (control). To do so, I want to calculate...

Asked on 11/14/2021 by user291972

1 answer

Unbiased estimatior for $bar{x} $ from a Random Sample with unequal selection probability

I have the following population: Where the left column is the age of our individuals and the right column is their weight (in...

Asked on 11/14/2021 by PLanderos33

1 answer

How the concordance index is calculated in Cox model if the actual event times are not predicted?

I am new to the field of survival analysis. I was reading about the interpretation of C-index and realized it only cares about the sequence of predictions. I was always...

Asked on 11/14/2021

2 answer

How to estimate the leafsize of the kd-tree?

The kd-tree implementation proposed by the scipy python libray asks for the value of the leafsize parameter that is to say the maximum number of points a node can hold....

Asked on 11/12/2021 by curiosus

1 answer

Understanding the Stata margins command on dichotomous variables

If I run the margins command on a dichotomous variable, what does the output tell me exactly? On a continuous variable I understand that it tells me the average value...

Asked on 11/12/2021

1 answer

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