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27 Cards in this Set
- Front
- Back
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is confounding a non causal relationship
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yes!!!!!!! but it IS causally related to the outcome just not in the cause pathway of exposure to disease outcome-- it's own pathwya
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what three conditions must be met in order for something to be confounding
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associated with the epxosure of interest (causally or not)
causally related to the outcome And is NOT part of the exposure outcome causal pathway |
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if you control for your factor and the OR goes down, then
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your variable was confounding
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what are some ways that you can control for confounding
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conduct RCT
matching statification adjustment |
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what is another name for interaction
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effect modification
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define effect modification
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refers to the situation where the effect of the risk factor differs depending on the presence or absence of a third factor.
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how can you determine if something is an effect modifier?
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if when you ask if the assocation is found in all groups? If your answer is it depends, then you have an effect modifier.
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what is adjustment
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use of stats to control for confounding
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what are two ways to stratify by stats
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adjustment based on stratification
adjusment based on multiple regression |
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what are two types of stratifciation adjustments
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direct method
mantel haenszel |
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what are four ways to use multiple regression
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mutliple linear
logistic cox poisson |
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how do you use antel haenszel
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adjust OR
weighted average of OR from strata formed by suspected confounder |
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T or false. regression coefficient epxresses the strength of the association between predictor and slope
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true!
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T or F. correlation coefficient expresses the strength of the association (slope)
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FALSE only tells you how good of a line is it
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what is the letter for regression coeffiecient
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B1
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Y =
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B0 +B1(X) + B2X + B3X
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put it in words-- if you talk about beta for age
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controlling for all other variables, for every 5 years incrase in age, leukocyte count decreases
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T or false. regression coefficient epxresses the strength of the association between predictor and slope
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true!
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T or F. correlation coefficient expresses the strength of the association (slope)
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FALSE only tells you how good of a line is it
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what is the letter for regression coeffiecient
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B1
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Y =
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B0 +B1(X) + B2X + B3X
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put it in words-- if you talk about beta for age
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controlling for all other variables, for every 5 years incrase in age, leukocyte count decreases
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define adjusted rate
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weighted average of age specific rates in the study population using as weight the number of individuals in an arbitrary standard population
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what is logistic regression
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multiple regression where the dependent variable is the log(Oddds)
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In logistic regression what is the ajusted OR =
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e^beta1
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what is required about the variable in logistic regression
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must be binary
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what is Cox proportional hazards regression
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log RR
multiple regression applied in the context of survival analysis. |
