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Reliability, Validity, Bias - Gathering, Analyzing and Using Educational Data - Lecture Slides, Slides of Statistics

Alagappa UniversityStatistics

Main topics covered in this course includes descriptive statistics, correlation, normal distributions, hypothesis testing, regression, ANOVA, and power. General goals of this course include: developing an understanding of statistical concepts, improving reasoning and critical thinking skills. This lecture keywords are: Reliability, Validity, Bias, External Validity, Internal Validity, Systematic Errors, Population, Generalizable Or Transferable, Internal Validity

Typology: Slides

2012/2013

Uploaded on 08/31/2013

dhaval
dhaval 🇮🇳

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Reliability, Validity, and Bias

Reliability

• Reliability is the extent to which an experiment,

test, or any measuring procedure yields the same

result on repeated trials.

  • Without the agreement of independent observers able to replicate research procedures, or the ability to use research tools and procedures that yield consistent measurements, researchers would be unable to satisfactorily draw conclusions, formulate theories, or make claims about the generalizability of their research.

External Validity

• External validity refers to the extent to which

the results of a study are generalizable or

transferable.

Internal Validity

  • Internal validity refers to
    • (1) the rigor with which the study was conducted; the study's design, the care taken to conduct measurements, and decisions concerning what was and wasn't measured
    • (2) the extent to which the designers of a study have taken into account alternative explanations for any causal relationships they explore
  • In studies that do not explore causal relationships, only the first of these definitions should be considered when assessing internal validity.

Bias can be due to…

  • Undercoverage
  • Nonresponse
  • Behavior of the interviewer or respondent
  • Poorly worded questions