“…1.4 Available data sources Günther et al (1998) describe in detail the different data sources which are used for panel-based market research. A "panel" is defined to be a sample which may be observed continuously and for several years if possible.…”
Section: Theories On Advertising Effectsmentioning
“…1.4 Available data sources Günther et al (1998) describe in detail the different data sources which are used for panel-based market research. A "panel" is defined to be a sample which may be observed continuously and for several years if possible.…”
Section: Theories On Advertising Effectsmentioning
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