# Why do we calculate the variance?

### Why do we calculate the variance?

It makes it possible to characterize the dispersion. values ​​relative to the mean. Thus, a distribution with the same expectation and variance larger will appear as more spread out. The fact that we take the square of these deviations from the mean prevents positive and negative deviations from canceling each other out.

### How to do the sum sign?

How to make the symbolSum“Σ (Sigma)

1. Make the symbolSum” under Windows (Microsoft software) Make the symbolSum” uppercase: Alt + 9 3 1 –>Σ …
2. Make the symbolSum” on Mac/MacBook. Make the symbol Uppercase “Sigma” (sum symbol): Alt ⌥ + ⇧ Shift + S –>Σ

### What is theta?

The Theta is an indicator measuring the impact of the passage of time in the price of the option (call or put). It corresponds to the value that will be subtracted from the option at each unit of time (day or week) that passes.

### What is the theta of an option?

Theta of an option. What is Theta? The Theta is an indicator measuring the impact of the passage of time in the price of the option (call or put). It corresponds to the value that will be subtracted from the option at each unit of time (day or week) that passes.

### What is the letter theta called?

In Modern Greek, the letter is called θήτα (thếta), pronounced /ˈθita/. In ancient Greek, it is called θῆτα (thễta), pronounced /tʰɛ̂ːta/. The letter theta is transmitted to the Etruscan alphabet via the Greek alphabet used in Euboea – alphabet that the Etruscans learned at Pithekusses (Ischia), near Cumae.

### What is Alphabet Theta?

In the Cyrillic alphabet, theta gives rise to the archaic letter fita, Ѳ, used to write proper names derived from Greek. The Slavic peoples, who adopt this alphabet, pronounce it [f] instead of [θ]. Suddenly doubling with the letter Ф, it was removed from Russian in 1918. In the…