# Tag Info

Accepted

### "Derivative" of an indicator function

As a matter of mathematical trivia, the derivative of an indicator function is zero, except at the threshold where it does not exist. But \begin{align} \mathbb E[\text{I}(i)] &= \mathbb E\big[\...
• 33.7k

### Lack of skilled IT workforce, but they do not raise wages

The factual observations you've listed fit neatly with the law of supply. You've seen that wages (price) have fallen, and during the same period, supply has gone down. The fact that companies ...
• 1,346
Accepted

### What R-squared is a low R-squared?

Disclaimer: this answer comes from a microeconomic research perspective. Time series / macroeconomic specialists will likely have other perspectives. There is no general rule for what's too low ...
• 458
Accepted

### Type - I Error & Type - II Error: Pregnancy test analogy - is it legit?

Presumably here the null hypothesis is $H_0:$ You are not pregnant the alternative hypothesis is $H_1:$ You are pregnant so being pregnant would be the positive result. You take a pregnancy test ...
• 4,755

### Calculating Gini Coeffecient

All of these answers are true but don't provide an easy solution which doesn't use excel/code. Gini can be fairly easily computed by hand too. The Gini coefficient fundamentally shows the shaded ...
• 954

### Python vs R (vs Stata): the old battle revisited

I use all three programs. Python can do everything that R can do and R can do everything that Python does, but I must say R is superior to Python when it comes to the packages. For that reason for ...
• 55.5k
Accepted

### How is Regression different from Econometrics?

To put it simply regression modeling is a technique, a tool, used by econometricians. Regression deals with dependence amongst variables within a model. But it cannot always imply causation. As ...
• 6,935
Accepted

• 33.7k

### Lack of skilled IT workforce, but they do not raise wages

Developing a point made in Dan's answer, it is important to distinguish between a movement along a supply curve and a shift of the whole curve, in this case the supply curve for skilled IT personnel. ...
• 8,346