Figure 6

Difference between the reference and estimated respiratory rates, namely \({f}_{th}(k)-{\widehat{f}}_{edr}(k)\), where \({\widehat{f}}_{edr}(k)\) was computed from \({\widehat{r}}_{rs}(n)\), \({\widehat{r}}_{dw}(n)\), \({\widehat{r}}_{sr}(n)\), and \({\widehat{r}}_{cm}(n)\). Differences are given in Hz. Each row corresponds, from top to bottom, to the Drivers, Fantasia, and Sleep datasets. For each case, the least-squares regression line is indicated by a solid line.