1. Abstraction : model is described using universal principles and properties- reusable across situations, hides complexity.
2. Transparency : close representation to real world-intuitively clear and understandable from any point of view.
3. Effectiveness : readily translated into actual information systems that are durable, reliable, and extensible.
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disadvantages *not to scale *there are limitations
Advantages and Disadvantages of primary data are: Advantages 1. Data is basic 2. Unbiased information 3. Original data 4. Data from the primary market/ population 5. Data direct from the population. Disadvantages. 1. Large volume of data. 2. Huge volume of population. 3. Time consuming 4. Direct and personal intervention has to be there. 5. Raw data.
two main early navigational data models were the hierarchical model and the CODASYL model (network model)
One advantage of inferential statistics is that large predictions can be made from small data sets. However, if the sample is not representative of the population then the predictions will be incorrect.
The main advantage of a Thurstone scale is that it provided data and information about AIDS. The biggest disadvantage is that it is very complicated to figure the data.