Table 3:
Performance measures and their definitions.
Metrics
Calculation
RMSE
R
M
S
E
=
∑
3
0
𝑖
=
1
(
𝑇
𝑖
−
𝑃
𝑖
)
2
/
3
0
MAD
∑
M
A
D
=
3
0
𝑖
=
1
|
𝑇
𝑖
−
𝑃
𝑖
|
/
3
0
MAPE
∑
M
A
P
E
=
3
0
𝑖
=
1
|
(
𝑇
𝑖
−
𝑃
𝑖
)
/
𝑇
𝑖
|
/
3
0
RMSPE
R
M
S
P
E
=
∑
3
0
𝑖
=
1
(
(
𝑇
𝑖
−
𝑃
𝑖
)
/
𝑇
𝑖
)
2
/
3
0
∗
N
o
t
e
that
𝑇
and
𝑃
represent the actual and predicted failure time, respectively.