# Grouped and ungrouped data

Introduction and Example Rounding of numbers is done so that one can concentrate on the most important or significant digits. A rich man might think in hundreds of thousands of dollars. GO Data Data can be defined as groups of information that represent the qualitative or quantitative attributes of a variable or set of variables, which is the same as saying that data can be any set of information that describes a given entity.

Data in statistics can be classified into grouped data and ungrouped data. Any data that you first gather is ungrouped data. Ungrouped data is data in the raw. An example of ungrouped data is a any list of numbers that you can think of. Grouped Data Grouped data is data that has been organized into groups known as classes.

## Direct Method

A data class is group of data which is related by some user defined property. For example, if you were collecting the ages of the people you met as you walked down the street, you could group them into classes as those in their teens, twenties, thirties, forties and so on.

Each of those groups is called a class. Each of those classes is of a certain width and this is referred to as the Class Interval or Class Size. This class interval is very important when it comes to drawing Histograms and Frequency diagrams. All the classes may have the same class size or they may have different classes sizes depending on how you group your data.

The class interval is always a whole number. Below is an example of grouped data where the classes have the same class interval.For grouped data, we cannot find the exact Mean, Median and Mode, we can only give estimates.

To estimate the Mean use the midpoints of the class intervals: Estimated Mean = Sum of (Midpoint × Frequency) Sum of Freqency. Unlike ungrouped data, grouped data has been organized into several groups.

## Measure of Central Tendency for Grouped Data - MEAN | NCERT MATH

To create grouped data, the raw data is sorted into groups, and a table showing how many data points occur in each group timberdesignmag.com  · Data sets that belong to Histograms, clusters, classes (ex: gender, nationality, customer segment) are grouped data and pretty much anything else (ex: date of birth, mobile numbers, emails, salaries etc) is considered timberdesignmag.com://timberdesignmag.com Apr 16,  · The word data refers to information that is collected and recorded.

It can be in form of numbers, words, measurements and much more. There are two types of data and these are qualitative data and quantitative data. The difference between the two types of data is that quantitative data is used to describe numerical.

## Grouped and Ungrouped Data - [PDF Document]

Median for Ungrouped Data. From KineticMaths. Jump to: navigation, search. The Median. The median is the middle value in an ordered array of numbers. To calculate the median value we should first consider the following steps: Arrange the data as an ordered array.

· Background: Poisson regression is routinely used for analysis of epidemiological data from studies of large occupational cohorts.

It is typically implemented as a grouped method of data analysis in which all exposure and covariate information is categorised and person-time and events are timberdesignmag.com://timberdesignmag.com

Frequency Distribution of Ungrouped and Grouped Data |Class Interval & Limits