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Collecting Quantitative Data. Creswell Chapter 6. Who Will You Study?. Identify unit of analysis Specify population Describe sampling approach Class = convenience sample Describe relevant characteristics. Permissions. IRB – VSU and administrator Student assent Parent consent

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Collecting quantitative data

Collecting Quantitative Data

Creswell Chapter 6


Who will you study
Who Will You Study?

  • Identify unit of analysis

  • Specify population

  • Describe sampling approach

    • Class = convenience sample

  • Describe relevant characteristics


Permissions
Permissions

  • IRB – VSU and administrator

  • Student assent

  • Parent consent

  • Colleague assent


What for
What for?

  • Any activity outside normal instruction

    • Activities

    • Survey/questionnaires

    • Interview

    • Audio or video records

    • Use of student work samples


What information
What information?

  • Consider RQs

  • Consider triangulation

    • Three Es

  • Consider covariates

    • Disaggregated subgroups

  • Include field notes


Types of measures
Types of Measures

  • Performance

  • Attitude – self-report

  • Behavior - observable

  • Facts - archival


What instruments
What Instruments?

  • Locating an instrument (p.160)

    • Standardized test prep CRCT

    • Norm-referenced STAR

    • Widely used instrument AR, DIBELS

    • Used in research

  • Creating an instrument


Reliability
Reliability

  • Scores are stable & consistent

  • Test-retest

  • Alternative forms

  • Split half

  • Inter-rater


Threats to reliability
Threats to Reliability

  • Questions or tasks are unclear

  • Data collection procedures are unclear

  • Assessment criteria are unclear

  • Student factors


Validity
Validity

  • Assessment

    • Makes sense

    • Is meaningful

    • Measures what is intended


Types of validity
Types of Validity

  • Content

    • Items represent target

  • Criterion

    • Scores related to outcomes

  • Construct

    • Scores are meaningful and fullfil purpose


Threats to validity
Threats to Validity

  • Poor research design

  • Poorly designed assessments

  • Irrelevant assessments

  • Inability to predict

  • Participant factors


Scales of measurement
Scales of Measurement

  • Nominal (categories)

  • Ordinal (ranking)

  • Interval e.g. Likert

  • Ratio (true zero)


Administration
Administration

  • Standardize procedures

  • Use written protocols

  • Record field notes ASAP

  • Ethics

    • Permission

    • Anonymity & confidentiality



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