Bias is a widely acknowledged form of systematic error, which distorts the process of investigation, research, and measurement of the research results. The researcher sought to eliminate bias by choosing random population selection procedures and creating a sample that adequately reflects the full spectrum of characteristics in the target group – participants from all performance groups had to reduce the sample bias in this study. As long as all participants voluntarily agreed to provide their responses, no participation bias was observed. No influence on the future participants was exerted, to make them participate against their will.
偏见是一个公认的系统误差，从而扭曲的调查，该过程的研究，以及研究结果的测量。研究人员试图通过选择随机种群选择程序和创建一个样本，充分反映了所有表演团体的目标群体–参与者的特点全谱不得不减少在本研究的样本偏置消除偏见。只要所有参与者自愿同意提供他们的反应，没有观察到参与偏见。在未来的参与者不影响所施加的，让他们参与违背自己的意愿。
