drug lit stats
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what determines statistical significance
alpha
what determines clinical significance
delta
variable that is being manipulated
factors or treatments
independent
variable that is the outcome
dependent
PICO
problem
intervention
comparison
outcome
intervention plus comparison is what
independent variable
discrete data
nominal and ordinal
lists/tables
continuous data
interval and ratios
graphs
male - female
nominal
difference between the poisson and the binomial distribution
binomial - all eligibe phenomena are studied
poisson - only the cases with a particular outcome are studied
scale - severity (pain scale)
ordinal
constant and defined units of measurement
scale that can cross 0. -20-----20
temperature
interval
scale that doesn't cross the O. 0-----32
if zero - then dead
ratio
normal curve tests
parametric
test of non-normal curve
nonparametric
when is a fisher's exact test used
if the expected value is less than 5
which scales have a SD
interval and ratio
standard deviation expressed as percentage of the mean
useful to compare the relative differences between two or more samples
coefficient of variation
the statistics found that the null hypothesis is false when it is really true
type I or alpha
the statistics found the null hypothesis is true when it is really false
type II or beta
what is the P in PICO studing
the population at risk
predetermined largest probability of a false non-rejection of the null the researchers are willing to accept
beta
the smaller selected the larger the sample size that is needed
probability that a difference will be detected and the null hypothesis will be rejected when it should be rejected
power
what is power usually
80%
what does power depend on
sample size
alpha level
delta
what is beta usually
20%
determine how much of a change want to see
effect size
delta
range of values that has a specified probability of containing the parameter being estimated
confidence interval
3 SEM
99%
2 SEM
95%
1 SEM
68%
how many times more likely an outcome is in one group compared to the other
risk ratio
odds of an outcome in one group compared to the odds of the outcome in the other group
odds ratio
the probability that a healthy person will develop A disease in a specified period
incidence
the number of cases at a specific time
prevalence
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Author:
tab
ID:
188592
Filename:
drug lit stats
Updated:
2012-12-11 01:03:20
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drug lit stats
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drug lit stats
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