Fig. 7
From: Adverse condition and critical event prediction in commercial buildings: Danish case study
ACCEPT graphical detection result plot with LIN and PV algorithm combination on fault case “ventilation fails”. As seen here the gradual evolution is non-linear (though tending to increase between fault start at 661 and fault end at 769) although the fault parameter vector is linear - that is due to the addition of the residual matrix (with small signal to noise ratio - SNR) in Eq. 12 as well as the possibility of the variable being to some extent non-linear with time even though it has been projected using only one score vector and containing high SNR