Like any other market research the amount of data required differs from brand to brand depending on factors such as:
The investment in purchase
Market size
The type of articles & authors
The brands compared against
We encourage you to validate your results against market data to provide greater certainty for you and we would love to help you with.
We recommend looking at behavioral data such as market and sales data to validate the data but also offer validation through opinion data such as: opinion polls if needed.
Here are some examples of sources you can validate your data against.
Market Data
Market share
Sales Data
Nielsen
Internal sales data
Opinion Polls