Stats Revision

History
Lowering of extremely high scores or the raising of extremely low scores during post-testing
Changes in biological and psychological conditions that occur in time. e.g., age, fatigue, hunger
Changes that occur over time in the measurement of the DV. e.g., human observer
 
Changes due to simple exposure of participants to the measurements, I.e., pre-test may sensitise participants
Differential loss of participants during a study. I.e., greater loss from one group than from others
Without random assignment we don't know if groups were equivalent prior to treatment
Affecting performance occurring between pre- and post- measurement of the DV
Maturation
Lowering of extremely high scores or the raising of extremely low scores during post-testing
Changes in biological and psychological conditions that occur in time. e.g., age, fatigue, hunger
Changes that occur over time in the measurement of the DV. e.g., human observer
 
Changes due to simple exposure of participants to the measurements, I.e., pre-test may sensitise participants
Differential loss of participants during a study. I.e., greater loss from one group than from others
Without random assignment we don't know if groups were equivalent prior to treatment
Affecting performance occurring between pre- and post- measurement of the DV
Measurement
Lowering of extremely high scores or the raising of extremely low scores during post-testing
Changes in biological and psychological conditions that occur in time. e.g., age, fatigue, hunger
Changes that occur over time in the measurement of the DV. e.g., human observer
 
Changes due to simple exposure of participants to the measurements, I.e., pre-test may sensitise participants
Differential loss of participants during a study. I.e., greater loss from one group than from others
Without random assignment we don't know if groups were equivalent prior to treatment
Affecting performance occurring between pre- and post- measurement of the DV
Statistical Regression
Lowering of extremely high scores or the raising of extremely low scores during post-testing
Changes in biological and psychological conditions that occur in time. e.g., age, fatigue, hunger
Changes that occur over time in the measurement of the DV. e.g., human observer
 
Changes due to simple exposure of participants to the measurements, I.e., pre-test may sensitise participants
Differential loss of participants during a study. I.e., greater loss from one group than from others
Without random assignment we don't know if groups were equivalent prior to treatment
Affecting performance occurring between pre- and post- measurement of the DV
Selection
Lowering of extremely high scores or the raising of extremely low scores during post-testing
Changes in biological and psychological conditions that occur in time. e.g., age, fatigue, hunger
Changes that occur over time in the measurement of the DV. e.g., human observer
 
Changes due to simple exposure of participants to the measurements, I.e., pre-test may sensitise participants
Differential loss of participants during a study. I.e., greater loss from one group than from others
Without random assignment we don't know if groups were equivalent prior to treatment
Affecting performance occurring between pre- and post- measurement of the DV
Instrumentation
Lowering of extremely high scores or the raising of extremely low scores during post-testing
Changes in biological and psychological conditions that occur in time. e.g., age, fatigue, hunger
Changes that occur over time in the measurement of the DV. e.g., human observer
 
Changes due to simple exposure of participants to the measurements, I.e., pre-test may sensitise participants
Differential loss of participants during a study. I.e., greater loss from one group than from others
Without random assignment we don't know if groups were equivalent prior to treatment
Affecting performance occurring between pre- and post- measurement of the DV
Mortality or attrition
Lowering of extremely high scores or the raising of extremely low scores during post-testing
Changes in biological and psychological conditions that occur in time. e.g., age, fatigue, hunger
Changes that occur over time in the measurement of the DV. e.g., human observer
 
Changes due to simple exposure of participants to the measurements, I.e., pre-test may sensitise participants
Differential loss of participants during a study. I.e., greater loss from one group than from others
Without random assignment we don't know if groups were equivalent prior to treatment
Affecting performance occurring between pre- and post- measurement of the DV
Interaction of the 7 threats with one another
Lowering of extremely high scores or the raising of extremely low scores during post-testing
Changes in biological and psychological conditions that occur in time. e.g., age, fatigue, hunger
Changes that occur over time in the measurement of the DV. e.g., human observer
 
Changes due to simple exposure of participants to the measurements, I.e., pre-test may sensitise participants
Differential loss of participants during a study. I.e., greater loss from one group than from others
Without random assignment we don't know if groups were equivalent prior to treatment
Affecting performance occurring between pre- and post- measurement of the DV
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