WK3-EBCII_Desc Stats

WK3-EBCII_Desc Stats - Biostatistics Basics An introduction...

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1 © 2006 Biostatistics Basics An introduction to an expansive and complex field
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Evidence-based 2 © 2006 Variable Types Independent variables Precede dependent variables in time Manipulated by the researcher Usually Tx or Intervention Dependent variables Outcome measures Depends on the independent variable
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Evidence-based 3 © 2006 Populations A population is the group from which a sample is drawn e.g., headache patients in a chiropractic office; automobile crash victims in an emergency room Practicality of inclusion Sample (a subset of a population)
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Evidence-based 4 © 2006 Random samples Selection method– equal chance or bias? Random samples are representative of the source population Non-random samples are not representative May be biased regarding age, severity of the condition, socioeconomic status etc.
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Evidence-based 5 © 2006 Random samples (cont.) Limited practicality in healthcare research Randomly assigned to treatment and control groups Equal chance Random assignment is also known as randomization
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Evidence-based 6 © 2006 Descriptive statistics ( DSs) A way to summarize data from a sample or a population DSs vs Inferential statistics DSs are not capable of testing hypotheses DSs illustrate the shape , central tendency , and variability of a set of data
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Evidence-based 7 © 2006 DSs terms The shape of data frequencies of the values of observations Central tendency location of the middle of the data Variability Spread or Dispersion
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Evidence-based 8 © 2006 Hypothetical study data (partial from book) Case # Visits 1 7 2 2 3 2 4 3 3 5 4 4 6 3 3 7 5 8 3 3 9 4 4 10 10 6 6 11 11 2 12 12 3 3 13 13 7 7 14 14 4 4 Distribution provides a summary of: Frequencies of each of the values 2 – 3 3 – 4 4 – 3 5 – 1 6 – 1 7 – 2 Ranges of values Lowest = 2 Highest = 7 etc.
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Evidence-based 9 © 2006
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This note was uploaded on 01/07/2012 for the course PHPR 1212 taught by Professor Young during the Summer '11 term at Palmer Chiropractic.

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WK3-EBCII_Desc Stats - Biostatistics Basics An introduction...

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