Statistics

Introduction to Collecting Data

Data Collection is the process of gathering and measuring information on targeted variables in an established systematic fashion, which then enables one to answer relevant questions and evaluate outcomes.

Types of Data Collection

• **Primary Data**: Data that is collected first-hand, directly from the source.
• **Secondary Data**: Data that has been already collected by someone else for a different purpose.

Methods of Data Collection

Primary Data Collection Methods:

• Surveys and Questionnaires
• Interviews
• Observations
• Experiments

Secondary Data Collection Methods:

• Literature Review
• Government Publications
• Company Records
• Internet

Factors to Consider in Data Collection

• **Reliability**: The consistency of the data collection method.
• **Validity**: The accuracy of the data collection method in measuring what it is intended to measure.
• **Bias**: Any influence that distorts the data collection process.