Table 4 Eigenvalues, eigenvectors of the covariance matrix and cumulative contribution of variance.

From: A multivariate process quality correlation diagnosis method based on grouping technique

No

Eigenvalues

Eigenvectors

Cumulative contribution rate of variance

1

2.9772

(− 0.5751, − 0.5653, − 0.5747, 0.1396)T

74.43%

2

0.9873

(0.0835, 0.1953, − 0.0384, 0.9764)T

99.11%

3

0.0236

(− 0.2351, − 0.5326, 0.7976, 0.1580)T

99.70%

4

0.0118

(0.7791, − 0.5989, − 0.1793, 0.0461)T

100%

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