Selection Bias

by Raywat Deonandan, PhD

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    About the Lecture

    The lecture Selection Bias by Raywat Deonandan, PhD is from the course Statistical Biases.

    Included Quiz Questions

    1. Sampling scheme
    2. Total population
    3. Informed consent
    4. Time-frame of study
    5. Method used for data collection
    1. Control subjects were chosen from patients’ with GI disorders
    2. Control subjects were chosen from hospitalized patients
    3. Control subjects did not include those with pancreatitis
    4. Control subjects were less likely to enjoy the taste of coffee
    5. Control subjects were more likely to leave the hospital prior to study completion
    1. Change the time of the meeting to avoid conflicting with working hours
    2. Distribute the flyer to more areas
    3. Offer more enticing compensation for study participation
    4. Change the study type from retrospective to prospective
    5. Recruit people at the hospital in person rather than with a flyer
    1. It is impossible to determine the presence of bias after the data has been collected
    2. Bias cannot be measured using statistics because it comes from the research process itself
    3. The error must be systematic and result in an incorrect association or estimate
    4. Bias is entirely or mostly avoidable
    5. It is easier to remove bias during design and implementation than during data analysis
    1. Create errors that can be measured through statistical analysis
    2. Mask an association between two variables that are really related
    3. Cause us to underestimate the size of a real relationship
    4. Cause us to overestimate the size of a real relationship
    5. Create a spurious relationship between two variables
    1. Those excluded due to informed consent
    2. Those excluded based on inclusion criteria
    3. All were discussed as potential sources of selection bias
    4. Those who are lost to follow up
    5. Those who chose not to participate in the study

    Author of lecture Selection Bias

     Raywat Deonandan, PhD

    Raywat Deonandan, PhD

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