## A Conceptual Vocalubary of Time Series Analysis

 Search full text

Browse the glossary using this index

Special | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | ALL

### D

#### difference operator

Differences of order d are defined as

$$\bigtriangledown^d=(1-B)^d$$

where we may expand the operator $$(1-B)^d$$ algebraically to evaluate for higher integer values of d. When d = 1, we drop it from the notation.