The data information collected through different sources should be organized. The information arranged in an ascending order is known as the array of data. The set of information related to specific entity is called the field.

The process of arranging data into homogenous group or classes according to some common characteristics present in the data is called classification.

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Spatial dependence is measured as the existence of statistical dependence in a collection of random variables, each of which is associated with a different geographical location.

When data are observed over a period of time the type of classification is known as chronological classification. Such type of classification helps to compare the data of different time periods.

Variables data is data that is acquired through measurements, such as length, time, diameter, strength, weight, temperature, density, thickness, pressure, and height. With variables data, you can decide the measurementâ€™s degree of accuracy.

Discrete variable over a particular range of real values is one for which, for any value in the range that the variable is permitted to take on, there is a positive minimum distance to the nearest other permissible value. The number of permitted values is either finite or countably infinite.

Class limits have the same accuracy as the data values; the same number of decimal places as the data values. The lower class limit of a class is the smallest data value that can go into the class. The upper class limit of a class is the largest data value that can go into the class.

A series of individual observations is a series in which items are listed individually.

Frequency is the number of occurrences of a repeating event per unit time. It is also referred to as temporal frequency, which emphasizes the contrast to spatial frequency and angular frequency