ROC curves in english.mov


Uploaded by drcuello on 13.08.2012

Transcript:
welcome back
thank you for being here
We will see the ROC curves
In five minutes, approximately
now remember the last
lecture when we saw
the sensitivity and the specificity in patients with
uh...
positive or negative tests
those tests were, such as the ultrasound, were
categoric tests
I mean, they were
whether positive or negative tests
let's imagine we now know use a continuous test
first we imagine this group of patients in which we suspect to have
appendicitis
some patients will have appendicitis and some patients will not have appendicitis
now we draw us our blood sample
chain we
experience
to seek or disease patients chand
there
healthy patient in these right
this then reversed as the white blood cells from three thousand to the right
twenty thousand to the left
ham
healthy patients and it is the station would be distributed and easily
approximately this is what happens in real-life
too much in the station
with twenty thousand
white blood cells
what will happen if we could see the station us possibly
pulley
peace with the station being a troop of skin
well with the station be a false positive
the station will be a
through positive
and we can
drove pauline
with it reported it
going up
wish represents the sensitivity
and there
towards possibly going to the right
represents
uh... one-liners if he said
now imaging team
tation
winter disease yet which is a true positive
is calling up india graphic
in blue
put peace patience without them decide as to the right becoming did direct
bosses d'etre portuguese
we remove will be going off
canada false-positive would be going
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this foregoing cry that software
wielding a sixteen-year
knees
which is cool
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and the low
gentler right on the square except you're here
which is called
and demanded a are a secret
now lives in st obtaining caught up plucked
took a lot of point
initiation obtained by
copyright
iddm program
the d_c_ needs to know
is usually
process
too much induced
uh...
hirose which one is a shorter
averell andes represents the best
coat off point
incase text
and hours katy steding thousand
white house sells burmese puny in here
now in my game have folded and dusty text just as compared
afforded investing tests
we have these these jewish inspections
best you can see there are
macy's pigeons used to be among
healthy patient so we can not
differentiate
uh...
and into the whole thing
d_c_ stations
willingness to take separate species from healthy
indices being stations will be to that
left
and a healthy patient would be to the right
pc seller ideal tests of course
that oldie stations
would be great to classify
setback this means that they would be true positives
and the false positives
would be to the right
as you can see you can't you hear obtained
capra fred
horrible secret
which area opportunity arrows he corp use one
this is the best extent you can never acting
these area under are a secret plan paint
indeed carrier its
plastics
and you can see now you can compare
one or two or more
continuous test