Types of Secondary dtaa
Documentary secondary data include written materials such as notices, correspondence (inclusing emails), minutes of meetings, reports to shareholders, diaries, transcripts of speeches and administrative and public records. Written documents can also include books, journal and magazine articles and newspapers, These can be important raw data sources in their own right as well as a storage medium for compiled data.
Survey based secondary data refers to data collected using a survey strateggy usually by questionnairs that have already been analysed for their original purpose.
Multiple source secondary data- can be based entirely on documentary or on survey secondary data or can be an amalgam of the two. The key factor is that different data sets have been combined to form another data set prior to your accessing the data.
Advantages of secondary data
- May have fewer resource requirements
- Unobtrusive
- Longitudinal studies may be feasible
- Can provide comparative and contextual data
- Can result in unforeseen discoveries
- Permanence of data
Disadvantages of secondary data
- May be collected for a purpose that does not match your need
- Access may be difficult or costly
- Aggregations and definitions may be unsuitable
- No real control over data quality