Quantitative Data

Quantitative data

- It is the data that can be measured and expressed in numerical terms. It is concerned with measurements like height, weight, volume, length, size, humidity, speed, age etc. The tabular and diagrammatic presentation of data is also possible, in the form of charts, graphs, tables, etc. Further, the quantitative data can be classified as discrete or continuous data.

Discrete data

reflects a number obtained by counting. Typically, it involves integers.

Continuous data

could be divided and reduced to finer and finer levels. The number of decimal places depends on the precision of the measuring device.

Interval data

is a data which not only classifies and orders the measurements, but also specifies the exact differences between the values.

Ratio data

tell us the exact value between units and also have an absolute zero.

Survey

It is used to collect/gather information from a group of people by employing printed questionnaires mailed to large samples, though it can also be done through the telephone.

experiment study

deliberately assigns subjects to various treatments for studying the reasons for changes in the output response(s).

observational study

collect data in a way that does not directly interfere with how the data arise, i.e. merely "observe".