ABSITE ch 44 statistics.txt

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alshada
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4859
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ABSITE ch 44 statistics.txt
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2010-01-23 16:51:33
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statistics ABSITE
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ABSITE ch 44 statistics
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  1. Incorrectly rejecting null hypothesis
    Type I error
  2. Accepting the null hypothesis incorrectly
    Type II error
  3. Hypothesis that no difference exists between groups
    Null hypothesis
  4. Spread of data around a mean
    Variance
  5. Prospective study with random assignment; avoids treatment biases
    Randomized controlled trial
  6. Prospective study where patient and doctor are not told what treatment will be; avoids observational biases
    Double blind controlled trial
  7. Prospective study comparing disease rates between exposed and unexposed groups
    Cohort study
  8. Retrospective study in which those who have the disease are compared with a similar population who do not have the disease
    Case-control study
  9. Combining data from different studies
    Meta-analysis
  10. Comparison of means from two groups of quantitative data
    Student´┐Żs T test
  11. Comparison of means of before and after studies
    Paired T test
  12. Comparison of means for more than 2 groups
    ANOVA
  13. Comparison of two groups with categorical variables
    Chi-squared test
  14. Incidence in exposed/incidence in unexposed
    Relative risk
  15. Probability of making the correct conclusion
    Power
  16. Number of people with disease in a population
    Prevalence
  17. Number of new cases diagnosed over a certain time frame in a population
    Incidence
  18. Ability to detect disease, or true positives/(true positives + false negatives)
    Sensitivity
  19. Ability to state no disease is present, or true negatives/(true negatives + false negatives)
    Specificity
  20. Likelihood that with a positive result, the patient actually has the disease
    PPV
  21. Likelihood that with a negative result the patient does not have the disease
    NPV
  22. True positives + true negatives/true positives + true negatives + false positives + false negatives
    Accuracy

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