Data series

A collection of related data points from a single data source that are viewable as a single row within a table. They represent the change over time of a specific indicator.

Dataset

A collection of data series that relate to a particular subject within a domain

Deficit areas

Areas that either do not produce or produce an insufficient amount of a given commodity to meet local demand (derived or final demand).

Dekad

Ten-day period, usually referring to a period of rainfall, starting on the first day of the month. Every month is composed of exactly three dekads. The last dekad of the month comprises days 21 through the end of the month, and can contain 8 to 11 days.

Demand curve

The relationship between the price of a commodity and the quantity that buyers are willing or able to buy, with all other things being equal. For most commodities, there is an inverse relationship between price and quantity demanded: a rise in price is associated with a decline in quantity demanded.

Derived demand

Demand for a commodity to be used as an input to another productive activity (e.g., the demand for maize as feed for poultry production).

Destination

The country where goods were ultimately delivered.

Dipole

Two opposing patterns in space.

Domain

Also, Data domain

A logical grouping of data that contains a collection of data series.

Drought

A drought is a period of below-average precipitation in a given region, resulting in prolonged shortages in the water supply, whether atmospheric, surface water or ground water. This document, however, makes a distinction between a single failed rainy season and consecutive failed rainy seasons; the latter is referred to as a drought.

Dynamic analysis of margins

Analysis of changes in marketing margins over time.

Dynamical forecasts

Dynamical models use laws of physics and observed conditions to estimate future conditions.