L5 -clinical research.360.s08

L5 -clinical research.360.s08 - Goals of clinical research...

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    Goals of clinical  research 1. Description: symptoms, effects of  mental illness, prevalence 2. Explanation: causes of disorders,  why do treatments work 3. Prediction: who will do well or  poorly 4. Control: does treatment work
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    Process of science Research question Hypothesis  Hypothesis testing  Theory REPEAT! Theory Data Hypothesis Theory development,  validation, correction
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    Steps of hypothesis testing 1. Defining your variables  2. Selecting a sample 3. Selecting a research design 4. Measurement considerations 5. Collecting data 6. Analyzing data 7. Making conclusions about  whether hypothesis is confirmed.
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    1. Defining variables Variable  = measurable  characteristic or condition with  two or more values Participant (or measured) variable Manipulated variable Continuous or grouping variable
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    Examples 1. Manipulated or participant variable? 2. Continuous or grouping variable? Optimism Abuse history Length of treatment Quality of treatment Anxiety
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    1. Defining variables Operation definition  = defining a  variable in measurable terms Hypothesis: Playing violent  videogames leads to violent behavior. Operational definition of “violent  videogames”? Operational definition of “violent  behavior”?
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    Examples Create operational definitions of: Happiness Intelligence Depression Hostility Fear
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    2. Selecting a sample Population  of interest!  Sample   Goal is generalization! Populatio n with  PTSD Sample
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    2. Selecting a sample Representative sample   = sample that  adequately represents population Sample size Random sample Chance variability: differences that  exist naturally between people Biased samples: not representative
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    Issues with clinical samples Finding participants Treatment settings Volunteer community samples Exclusion criteria Regression to the mean
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    3. Selecting research  design Non-experimental research Experimental research Single-case studies Meta-analysis
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    Non-experimental research All variables are measured  Methods  Surveys and interviews Observations Cross-sectional vs. longitudinal
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    Epidemiological research Surveys/interviews with HUGE  samples Outcomes of study: Incidence Prevalence Lifetime prevalence Risk factors
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  Non-experimental  research Pros Easier, cheaper Can determine direction of relationship! More
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This note was uploaded on 02/11/2009 for the course PSYC 360 taught by Professor Borders during the Fall '07 term at USC.

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L5 -clinical research.360.s08 - Goals of clinical research...

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