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Details

EBM wk 3
Introduction to Basic statistical concepts, hypothesis testing, and searching the national library of medicine (LLUSOM 2014)
30
Medical
Professional
09/18/2010

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Cards

Term
Nominal data
Definition
Qualitative, Numbers used to classify data into groups

Ex. hair color, gender

Bar Graph

Measure of central tendency: Mode
Term
Ordinal
Definition
Ranks, numbers used to rank data

Ex. economic status

Bar Graph

Measure of central tendency: Mode & Median
Term
Continuous
Definition
quantitative, numeric data with fixed intervals between values

ex. height, blood pressure, etc

Histogram

Measure of central tendency: Mode, Median and Mean
Term
Mean
Definition
average
Term
Median
Definition
middle observation
Term
mode
Definition
most frequent number

least useful
Term
Distrubutions of Data: Skewed to the Right
Definition
[image]

Positively Skewed

mean > median
Term
Distrubutions of Data: skewed Left
Definition
[image]

Negatively Skewed

median > mean
Term
Distrubutions of Data: Kurtosis
Definition
More peaked than normal = positive

More flattened than normal = negative
Term
Bell Curve percentages
Definition
[image]
Term
Proportion
Definition
A/A+B
Term
Ratio
Definition
A/B
Term
Incidence Rate
Definition
New, from cohort and clinical trials

Total # new cases over a specified time period/ Total population at risk over time period
Term
Prevalence Rate
Definition
All, from cross-sectional and clinical trials

depends on duration of disease


total # of disease at given pt in time/ Total pop. at the same time
Term
Hypothesis Testing Steps
Definition
1. State hypothesis
2. Decide statistical test
3. Select level of significance for test
4. Calculate
5. Draw and (re)state conclusion
Term
Null Hypothesis
Definition
Ho: No difference between two variables

if p>0.05 retain null
Term
Type I or alpha error
Definition
Incorrectly rejecting the null when p<0.05

False postive
Term
Type II or Beta Error
Definition
Incorrectly retaining null when p>0.05

False negative

most common reason is insufficient sample size
Term
probabilty of obtaining a false abnormal
Definition
1 - (1-.05)^n
Term
Power
Definition
the probability a study will detect a clincally important difference if one exists

1-B
1-.20 = .80 or 80%
Term
Therapy: Best study design?
Definition
Randomized Control
Term
Diagnosis: study design
Definition
cross-sectional survey
Term
Screening: study design
Definition
cross- sectional survey
Term
Prognosis: study design
Definition
cohort study
Term
Causation: study design
Definition
cohort study or case-control study
Term
"4S" Sources of evidence
Definition
Systems, Synopses, summaries (cochrane, UpToDate), studies (national library of medicine)
Term
Therapy: best search term
Definition
clinical trial [publication type]
Term
diagnosis: best search term
Definition
sensitivity [text word]
Term
prognosis: search term
Definition
cohort studies
Term
etiology/harm: search term
Definition
risk [text word]
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