Notes: Statistics Lecture - Data Collection

Introduction

• Statistics Chapter 2: Discussion on Data Correction and Collection.
• Purpose of discussion: How to collect data, primary and secondary sources.

Data Sources

1. Primary Data Collection

• Personal Interviews:
  • Direct personal investigation.
  • Data collection through direct conversation with individuals.
  • Use:
    • Suitable for small scale.
    • Necessary for accuracy and originality.
• Use of Witness:
  • Suitable for special events.
  • Risk of personal bias.

2. Secondary Data Collection

• Published Sources:
  • Data published by government (e.g., RBI bulletins, Agricultural Statistics).
  • Newspapers and research papers.
• Institutional Sources:
  • Census India, National Sample Survey Office.
  • Important for policymaking and secondary data finding.

Data Collection Methods

• Correspondent Method:
  • Use of correspondents in large areas.
  • A way to get continuous information.
• Mail and Questionnaires:
  • Wide coverage, low cost, time-saving.
  • Limitations: Less flexibility.
• Enumerator Method:
  • Data collection through personal interviews.
  • High cost and time requirement.
• Telephonic Conversation:
  • Data collection by phone, limited accuracy.

Conclusion

• Utility and limitations of various sources and methods.
• Choosing the right method for data collection is important.
• Major contribution of Census and National Sample Survey Office in data collection in India.