<P> In applied statistics, (e.g., applied to the social sciences and psychometrics), common - method variance (CMV) is the spurious "variance that is attributable to the measurement method rather than to the constructs the measures are assumed to represent" or equivalently as "systematic error variance shared among variables measured with and introduced as a function of the same method and / or source". For example, an electronic survey method might influence results for those who might be unfamiliar with an electronic survey interface differently than for those who might be familiar . If measures are affected by CMV or common - method bias, the intercorrelations among them can be inflated or deflated depending upon several factors . Although it is sometimes assumed that CMV affects all variables, evidence suggests that whether or not the correlation between two variables is affected by CMV is a function of both the method and the particular constructs being measured . </P> <P> Several ex ante remedies exist that help to avoid or minimize possible common method variance . Important remedies have been compiled and discussed by Chang et al. (2010), Lindell & Whitney (2001) and Podsakoff et al. (2003). </P>

Difference between common method variance and common method bias
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