11 questions linked to/from Understanding "variance" intuitively
260k views

### Statistics Jokes

Well, we've got favourite statistics quotes. What about statistics jokes?
326k views

### Why square the difference instead of taking the absolute value in standard deviation?

In the definition of standard deviation, why do we have to square the difference from the mean to get the mean (E) and take the square root back at the end? Can't we just simply take the absolute ...
• 5,875
168k views

### How would you explain covariance to someone who understands only the mean?

...assuming that I'm able to augment their knowledge about variance in an intuitive fashion ( Understanding "variance" intuitively ) or by saying: It's the average distance of the data ...
• 14.8k
57k views

### Intuitive explanation of unit root

How would you explain intuitively what is a unit root, in the context of the unit root test? I'm thinking in ways of explaining much like I've founded in this question. The case with unit root is ...
• 2,062
26k views

### What is a standard deviation?

What is a standard deviation, how is it calculated and what is its use in statistics?
• 949
67k views

### Conceptual understanding of root mean squared error and mean bias deviation

I would like to gain a conceptual understanding of Root Mean Squared Error (RMSE) and Mean Bias Deviation (MBD). Having calculated these measures for my own comparisons of data, I've often been ...
2k views

### What is sigma2 in output of MCMC regression by MCMCregress of MCMCpack package of R

I am using following data and code: ...
• 10.1k
666 views

### How far is my average from the series values?

I'm sure there's a name for this concept, but I can't find it (I'm not familiar with statistical terms): Suppose I have a series of numbers, and an average of those. I'm wondering how correct this ...
• 113
345 views

### Empirical Implications of Unbiased Estimators

I am familiar with the layperson explanation of an unbiased estimator as follows: if we repeat an experiment under identical conditions many times, the average value of the estimate will be close to ...
173 views

### Intuitive explanation of "invariance"

...assuming that I'm able to augment their knowledge about variance in an intuitive fashion Understanding "variance" intuitively and about covariance How would you explain covariance to ...
• 2,955
1 vote
### What is the intuition behind the $N$ in the denominator in the definition of variance?
There are many questions and answers on why $n-1$ is used instead of $n$ in sample vs population variance. However, I wonder why the population variance definition even has $n$ in the first place. The ...