All of these changes can introduce biases into the stations' long term records.

Missing data may have introduced bias into our results.

The low response rates for blood donation could also have introduced bias, the direction of which would be difficult to predict.

The experimenter may introduce cognitive bias into a study in several ways.

First, the retrospective nature of the data collection introduces inherent biases.

In addition, she noted, "the subjects were not randomly selected," a factor that might have introduced bias into the results.

This approach can introduce biases to the statistical analysis.

The objective is to be able to choose one theory as preferable to another without introducing cognitive bias.

Because volunteers have insufficient training in research and monitoring protocols, they are more at risk of introducing bias into the data.

Make sure you're not introducing bias into your readings (e.g. taking measurements at different times of day).