Cross Validated Questions, Problems & Solutions : TransWikia.com ~ Page 42

Getting Different R-squared for Same Model Equation

I have built two linear model in R using 'lm' function with some tricks as follows: Model-1: With default optionl1 <- lm(dist ~ speed, data = cars)Model-2: Supplying the...

Asked on 11/09/2021

0 answer

How to maximize the steady state transition probability for a state in a Markov chain by altering that state's outgoing transition probabilities?

Let's say we have a transition matrix of which can be solved to come up with steady state transition probabilities...

Asked on 11/09/2021 by Rob Goldstone

0 answer

Find out if increase in a series of values is statistically significant

Let's say I have a series of previous year's weekly sales for a product ${x_i}$ and the series of sales for the same product this year ${y_i}$. How...

Asked on 11/09/2021

1 answer

Covariance between sample mean of two simple random samples

Suppose that we have two simple random samples without replacement $A$ and $B$ from a population $P$ of size $N$ such that $B = P-A$...

Asked on 11/06/2021 by Ana Pau De la Fuente

0 answer

Distribution of the maximum of two correlated normal variables

Say I have two standard normal random variables $X_1$ and $X_2$ that are jointlynormal with correlation coefficient $r$. What is the distribution function of $max(X_1, X_2)$? ...

Asked on 11/06/2021

2 answer

How to formulate a classification problem with time series element

Let’s say i want to do customer attrition prediction. Now customer attrition can happen anytime during an year. There are 2 ways i can think of setting up the problem.Fix...

Asked on 11/06/2021 by Rishu

1 answer

Asymmetric error measure for forecasts

I am building a model for forecasting some number of activations. My data set has a panel structure. Now, I want to come up with a forecast performance measure...

Asked on 11/06/2021 by user235039

1 answer

How to model variance of a heteroskedastic dataset

I have a dataset (scatter plot shown below) where x-axis corresponds to observed value and y-axis being the true value (yeah, sort of flipped from the convention where y is...

Asked on 11/06/2021 by Yilei Huang

1 answer

What analysis do I do? (Wage, education, gender)

I'm doing research on pay in function of degree (master vs. doctorate) and gender (man vs. woman). My research consists of 1 dependent variable: salary (salary varies from 210 euro...

Asked on 11/06/2021 by marvdste

2 answer

Is random seed a hyper-parameter to tune in training deep neural network?

For building deep neural networks, there are a lot of random components in each training. On one hand, I feel it is uncanny to "tune" random seed. But in my...

Asked on 11/06/2021

1 answer

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