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Sampling/Study Design

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by

habeba ali

on 23 February 2015

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Transcript of Sampling/Study Design

Sampling/Study Design
Expressing the Results
Type of bias:
1-lead time bias
Discussing the Results
type of bias:
1-Confounding bias:
you can try to
decrease
but you can
never eliminate
all factors affecting
the results of your intervention
Corresponding type of bias:
1-convenience sample
2-
berkson's bias
3-volunteer effect/non respondent bias
solution:
1-random independent sample
2-weight data

sampling
design
commonest type of bias
:
1-incomparable groups
solution:
random ascertainment
Data Collection
#Data itself
#Data Collection
#Time you looked for the data
type of bias:
1-Late look /Spectrum bias
#Person who is collecting the data
type of bias:
1-Experimenter Expectancy
type of bias:
1-Recall bias

solution:
2-triangulation/confirmation
Type of bias:
1-
measurment bias:
a-Method of collection
e.g leading question
b-
Hawthorne effect
solution:
1-control Group
solution:
1-stratification


solution:
1-double Blinding
solution:
1-use
Life Expectancy
instead of how long patient lives after diag.
Solution:
1-
Metanalysis
of Multiple studies
Full transcript