Biomed Stats

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Author:
cbennett
ID:
300420
Filename:
Biomed Stats
Updated:
2015-04-10 14:21:32
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biomed stats
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Biomed Stats
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  1. non-numeric or narrative info
    qualitative data
  2. numeric or quantifiable info (ex: weights of kindergartners)
    quantitative
  3. variable the researcher manipulates
    independent variable
  4. the variable the researcher is attempting to prove.
    dependent variable
  5. infinite number of values between two points
    cannot be 1.5 children, etc...
    discrete variable
  6. has, in theory, an infinite number of values between two points
    ex: body temp
    continuous variable
  7. NOIR
    • nominal
    • ordinal
    • interval
    • ratio
  8. lowest level
    assigns characteristics into categories
    nominal or named variable
  9. next in hierarchy of measurement
    rank order of variable along some dimension
    ordinal or Order
  10. attribute is rank-ordered on a scale that has equal distances between points on that scale
    interval = equal distances
  11. equal distances between score units and which has a true, meaningful zero point
    (a true ratio can be calculated)
    ratio measurement
  12. higher levels of measurement provide ...
    • more information
    • can be analyzed with more powerful stat tools
  13. a subset of a population
    ideally selected to be representative of the population
    sample
  14. the entire set of individuals having common characteristics
    population
  15. used to describe and summarize data set
    allows us to describe, compare, determine a relationship
    usually straightforward
    descriptive
  16. draw conclusion about a single variable in a population
    evaluate relationships between variables
    are the relationships "real"?
    inferential
  17. Type of stat that measures:
    existence of relationship between x and y
    magnitude of the strength of relationship
    the nature of the relationship
    inferential stats
  18. one variable being described
    univariate
  19. two variables being compared
    bivariate
  20. more that two variables being compared
    multivariate
  21. Name the two kinds of frequency
    • absolute
    • relative
  22. symbol: f
    number of times a score occurs
    absolute frequency
  23. most commonly percent %=(f/N) X 100
    proportion of times a score occurs
    relative frequency
  24. Name the 5 basic shapes of charts
    • modality
    • symmetry and skewness
    • kurtosis
    • central tendency
    • variability
  25. modality
    • peaks or high points in the data
    • unimodal
    • bimodal
    • multimodal
  26. draw a line through the center and produces mirro images
    symmetrical
  27. distribution is lopsided or skewed
    asymmetrical
  28. the skewed tail points to the right
    positive skewness
  29. the skewed tail points to the left
    negative skewness
  30. refers to how pointy the peak of distribution
    how concentrated the middle of the distribution
    • kurtosis
    •   platykurtic (low, flattened)
    •   leptokurtotic (high narrow)
  31. Ideal distribution
    bell-shaped curve
    unimodal
    symmetrical
    normal distribution
  32. when do you use a bar graph?
    discrete info
  33. when do you use a histogram
    continuous info
  34. the point at 25% below and 75% above the median
    Quartile 1 (Q1)
  35. the point at 50% below and 50% above the median
    Quartile 2 (Q2)
  36. the point at 75% below and 25% above the median
    Quartile 3 (Q3)

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