CS Foundation Methods of Collection of data video lectures & Notes
‘Takshila Learning’ your Online study partner is engaged in imparting online lectures for School and Professional courses and also give online training courses like Digital Marketing, Excel & IFRS. Today from our Online Classes CS Foundation segment, we have chosen the topic ‘Collection of Data from Elementary Statistics’.
A Collection of data is the systematic approach to gathering and measuring information from a variety of sources to get a complete and accurate picture conducting by enumeration. The collected data should be numerical in nature, i.e. quantitative, so that we can amply statistical methods and presentation, analysis and interpretation of the same.
Broadly speaking, there are two types of data:
- Primary data
- Secondary data
Primary data are fresh, original and first-hand information’s. This information’s are collected directly from the source by means of field studies. Primary data are original. It is the crudest form of information. The investigator himself collects primary data through surveys, descriptive researches or supervises its collection. It may be collected on a sample, a census basis, or from case studies.
Secondary data are the second-hand information’s collected by someone else. The data which have already been collected and processed by some agency or persons are termed as secondary data. Secondary data may be abstracted from existing records, published sources, or unpublished sources.
PRECAUTION WHILE USING SECONDARY DATA
Before using the secondary data, the investigator should take following precautions:
- Suitable Purpose of Investigation:
First of all, the investigator must ensure that the data are appropriate for the purpose of investigation.
- Adequate Data:
Competency of the data is to be judged in the light of the requirements of the survey as well as the geographical area covered by the available data.
- Definition of Units:
The investigator must ensure that the definitions of units which are used by him are with the earlier investigation. Change of units may lead to wrong conclusions.
- The Degree of Accuracy:
The investigator should note the degree accuracy maintained by each investigator.
- Time and Condition of Collection of Facts:
There should not have been a change of conditions now and then when these were collected. The data which were collected during other times may not suit during the days of calamities.
The investigator should check whether the secondary data is reasonable, consistent, and comparable.
- Homogeneous Conditions:
It is not safe to use published statistics at their face value without knowing their values, means, and limitations.
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