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Silverfish
  • Member for 9 years, 4 months
  • Last seen this week
198 votes

Correlation between a nominal (IV) and a continuous (DV) variable

63 votes

Geometric interpretation of multiple correlation coefficient $R$ and coefficient of determination $R^2$

52 votes

"The total area underneath a probability density function is 1" - relative to what?

51 votes
Accepted

Generating random numbers manually

45 votes
Accepted

What does an Added Variable Plot (Partial Regression Plot) explain in a multiple regression?

44 votes
Accepted

How can the regression error term ever be correlated with the explanatory variables?

42 votes

Intuitive explanation of convergence in distribution and convergence in probability

37 votes

If my histogram shows a bell-shaped curve, can I say my data is normally distributed?

36 votes
Accepted

In multiple linear regression, why does a plot of predicted points not lie in a straight line?

35 votes
Accepted

The linearity of variance

34 votes

Graph for relationship between two ordinal variables

33 votes
Accepted

Does mean = median imply that a unimodal distribution is symmetric?

32 votes
Accepted

Is there any difference between $r^2$ and $R^2$?

27 votes

What is an example of perfect multicollinearity?

26 votes
Accepted

How does one find the mean of a sum of dependent variables?

24 votes

Odds made simple

24 votes

What are some of the most common misconceptions about linear regression?

23 votes

What is the distribution of $R^2$ in linear regression under the null hypothesis? Why is its mode not at zero when $k>3$?

22 votes
Accepted

Why are “time series” called such?

21 votes
Accepted

Is using correlation matrix to select predictors for regression correct?

21 votes

Why shouldn't the denominator of the covariance estimator be n-2 rather than n-1?

20 votes

Correlation between OLS estimators for intercept and slope

20 votes

Real life examples of distributions with negative skewness

20 votes

If X and Y are uncorrelated, are X^2 and Y also uncorrelated?

20 votes

Is standard deviation totally wrong? How can you calculate std for heights, counts and etc (positive numbers)?

19 votes
Accepted

Will larger correlation coefficient values result in greater slopes between x and y?

19 votes
Accepted

Will two distributions with identical 5-number summaries always have the same shape?

19 votes
Accepted

Ink to data ratio and plot backgrounds

18 votes

How to derive the mean and variance of a $k$-truncated Poisson?

17 votes
Accepted

Why are principal components in PCA (eigenvectors of the covariance matrix) mutually orthogonal?