Table 6 Computes the time and space complexity in MS and BT, respectively for each classifier based on the different feature sets.

From: BOO-ST and CBCEC: two novel hybrid machine learning methods aim to reduce the mortality of heart failure patients

Features set

Time complexity

Space complexity

DT

GB

SVM

ET

CBCEC

DT

GB

SVM

ET

CBCEC

ALL

15.3

106

82.8

53.2

1351

7145

172,333

38,555

1,807,929

2,476,100

FI

12.2

105

77.1

26.3

957

7097

172,301

33,499

1,720,345

2,471,340

IG

11.8

82.2

53.6

24.5

754

7113

170,140

33,515

1,740,521

2,475,788

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