biostat Flashcards
likelihood ratio
+; sen/1-speci
-:(1-sen)/speci
intention to treat
keeps randomization
dependent and independent variables and study type
qual: chi-square, logistic regression —-t-test, anova, linear regression
quan; logistic regression————-correlation, linnear regression
fatality vs mortality rate
fatality in a perticular population ( in Heart attach and using a procedure ) mortality is that procedure in general population
ascertainment bias
study pupolation is differ from target population due to nonrandom selection methos
berkson bias
disease studied using only hospital based population
prevalance bias
or neyman, exposure happen long before disease assessment can cause study to miss disease patients that die or recover
attrition bias
significant losss of sudy participant
primary secondary tertiary and quanternary preventions
second+ comlications and irreversiible pathological changes,
tertiary; limit the impairment and disabilities,
quaternary ;unnecessary and excessive interventions by the health care, (medical record to limit the unnecessary repeat cardiac catheterization)
mcneamer test
patinet their own control
HOW TO find the modifier
stratification(two groups ) analysis
liklihood ration
the probability of an indevidual with disease testing positive divided by the probability of an individual without the disease testing positive
Hawthorne effect
awareness of the participation impact the behavior
the opposite of intention to treat
pre portocol
standardized mortality
whatever wwith standardiezed at first = what happened vs EXPECTED
