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Message: Be careful for bias in sampling

A goal of the Six Sigma project manager, in the MEASURE phase, is to recognize potential bias in the data (or responses) and prevent it from coming into play if possible. Forms of bias that can be introduced into the sampling strategy are:

• Convenience Bias: Often found when time or money is serious constraint and sampling only done when it is convenient. 
• Non response Bias: When a response is needed according to the sampling strategy but the response is incomplete or not provided at all. 
• Response Bias: Occurs when response is misleading, inaccurate or untruthful. occurs when the responder feels pressure that occurs during data collection and influences the response (i.e. social pressure to be accepted and avoid conflict). 
• Voluntary Response Bias: when sample members are self-selected volunteers or when the responders (often people) can choose whether to participate. The resulting sample tends to overrepresent individuals who have strong opinions.