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Lecture 23

CSC302H1 Lecture 23: 2014.04.01


Department
Computer Science
Course Code
CSC302H1
Professor
Matt Medland
Lecture
23

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! EFFORT ESTIMATION

o
estimated
(
F
)
≤ estimated
(
N
)
∙ estimated
(
T
)
o
 !!"#$
$%%!"#$
An estimate&!' (
)(
oThree-point Estimating*!
)
wi
&(+
mi
&) 
bi
&!+
E=
i
wi+4mi+bi
6
Condence Intervals
oCondence Intervals for Work Factor
(!(
!! !*
!! (!(

#!((,!! $ 
-,$.
x-axis&!!
y-axis&!- ./&
,!! (!((-!.&
,$!(-!.+
0()!! 
!&1
2-
.()&1
23(3(45%) 678(
/&5
oCondence Intervals for Feature Estimation
,$
oCondence Intervals for Delta (from Capacity
Constraint)
F

N
&!
T
&9
F
 !
!
f1, f 2, … , f k
0
f1, f 2, … , f k
!!! 
!
6&

:$'
'
$!
F
) !

!!
dev1, dev2, … , devn
;) !!<&!
$2
D
(
T
)
=N ∙ T F
&
,&(
)
T

P
(
D
(
T
)
0
)
!9
 *
D
(
T
)
80
2
-&5(+8
P
(
D
(
F
)
500
)
=90
.
-(+8
P
(
D
(
F
)
5
)
=90
.
#&$9
(78&
1
(=&
578
:2
# #(
=(-!.6
=9
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