We recorded that across the British national press there is consistent, systemic bias against women. (politics.co.uk)
Use of anomalies also removes any potential systemic bias in those measurements. (skepticalscience.com)
Moreover, samples are often unrepresentative of the population, introducing systemic biases by overweighting the preferences of certain demographics: Yair Lapid had always predicted that he would win more seats than he was forecast, because pollsters relied on calling people by landline, and his supporters, predominantly young, had only mobile phones. (blog.politics.ox.ac.uk)