The document Notes - Organisation of Data Class 11, Statistics for Economics | EduRev Notes is a part of the Commerce Course Statistics for Economics - Class XI.

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**Organization of Data**

1. Classification of Data: The process of grouping data according to their characteristics is known as classification of data.

2. Objectives of Classification:

a] To simplify complex data

b] To facilitate understanding

c] To facilitate comparison

d] To make analysis and interpretation easy.

e] To arrange and put the data according to their common characteristics.

3. Statistical Series: Systematic arrangement of statistical data

**I. Can be on the basis of individual units :**

The data can be individually presented in two forms:

i] Raw data: Data collected in original form.

ii] Individual Series: The arrangement of raw data individually. It can be expressed in two ways.

a] Alphabetical arrangement : Alphabetical order

b] Array: Ascending or descending order.

**II. Can be on the basis of Frequency Distribution:**

Frequency distribution refers to a table in which observed values of a variable are classified according to their numerical magnitude.

1. Discrete Series: A variable is called discrete if the variable can take only some particular values.

2. Continuous Series: A variable is called continuous if it can take any value in a given range. In constructing continuous series we come across terms like:

a] Class : Each given internal is called a class e.g., 0-5, 5-10.

b] Class limit: There are two limits upper limit and lower limit.

c] Class interval: Difference between upper limit and lower limit.

d] Range: Difference between upper limit and lower limit.

e] Mid-point or Mid Value: Upper limit - Lower limit

2

f] Frequency: Number of items [observations] falling within a particular class.

**i] Exclusive Series: Excluding the upper limit of these classes, all the items of the class are included in the class itself. E.g., :**

Marks | 0-10 | 20-Oct | 20-30 | 30-40 |

Number of Students | 2 | 5 | 2 | 1 |

**ii] Inclusive Series: Upper class limits of classes are included in the respective classes. E.g.,**

Marks | 0-9 | 19-Oct | 20-29 |

Number of Students | 2 | 5 | 2 |

**Open End Classes : The lower limit of the first class and upper limit of the last class are not given. E.g.,**

Marks | Below 20 | 20-30 | 30-40 | 40-50 | 50 and above |

Number of Students | 7 | 6 | 12 | 5 | 3 |

**iii] Cumulative Frequency Series: It is obtained by successively adding the frequencies of the values of the classes according to a certain law.**

a] â€˜Less thanâ€™ Cumulative Frequency Distribution :

The frequencies of each class-internal are added successively.

b] â€˜More thanâ€™ Cumulative Frequency Distribution:

The more than cumulative frequency is obtained by finding the cumulative totals of frequencies starting from the highest value of the variable to the lowest value.

Marks | No. of Students |

0-10 | 2 |

10-20 | 5 |

20-30 | 10 |

30-40 | 12 |

40-50 | 17 |

50-60 | 4 |

Marks | No. of Students |

Less than 10 | 2 |

Less than 20 | 7 |

Less than 30 | 17 |

Less than 40 | 29 |

Less than 50 | 46 |

Less than 60 | 50 |

Marks | No. of Students |

More than 0 | 50 |

More than 10 | 48 |

More than 20 | 43 |

More than 30 | 33 |

More than 40 | 21 |

More than 50 | 4 |

52 videos|42 docs

### NCERT Textbook - Organisation of Data

- Doc | 18 pages
### Discrete and Continuous

- Video | 18:23 min
### Definitions and Classification

- Video | 12:07 min
### NCERT Solutions - Organisation of Data

- Doc | 6 pages

- Classification and Series
- Video | 14:41 min