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200370
Odds Ratio
Descrição
HBS108 (Measures of Association) Mapa Mental sobre Odds Ratio, criado por shirley.ha em 10-09-2013.
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hbs108
measures of association
hbs108
measures of association
Mapa Mental por
shirley.ha
, atualizado more than 1 year ago
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Criado por
shirley.ha
quase 11 anos atrás
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Resumo de Recurso
Odds Ratio
similar to RR but...
1. Is used mainly to analyse data from case-control studies.
2. Gives an approximation to the RR
3. Is used when RR is inappropriate (e.g., when examining rare diseases in the population using case-control designs).
4. Both OR and RR are also accompanied by confidence intervals.
ratio of the odds of exposure among cases to the odds of exposure among the controls.
why we use it?
Because RR cannot be calculated in case-control studies, because these studies usually examine rare and uncommon diseases
Unlike a cohort study, we do not know the risk for exposure in the population
Interpretation
used to calculate risk from case-control studies but if the study is done well (that is, bias is limited as much as possible and the disease is rare),
valid measure of association that approximates the RR from a cohort study
the larger the OR, the stronger the association between the disease and the exposure
Confidence Intervals
provide information about the precision of the association.
CORRELATION CO-EFFICIENT (r)- Measures of assoc btwn the two variables
statistical measurement describing the degree and strength of the association between two continuous variables
Correlation rules
r=0
is no association between the variables
r=1
perfect +ve correlation, meaning that both variables move in the same direction together.
r=-1
perfect -ve correlation, meaning that as one variable goes up, the other goes down
measures the degree to which values for two measures move together in a synchronised manner
r closer 0- INDEPENDENT
CLOSER TO ONE ANOTHER- DEPENDENT
2 ASPECTS
Strength
Direction
correlation by itself does not imply causation
correlations assess the strength of associations.
Anexos de mídia
r (image/png)
r-correlation (image/png)
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