39 research outputs found

    Permutation-Based Variance Importance Measure.

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    <p>The variables are ranked from the most important (top) to the least important (bottom). Variable importance is represented on the x-axis as the z-score. SAPS II: Simplified Acute Physiology Score II; ARDS: acute respiratory distress syndrome; Charlson: modified Charlson comorbidity index; ICU: intensive care unit.</p

    Single Classification Trees.

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    <p>Each node in the tree represents the splitting variable, as well as the splitting threshold for continuous variables.</p

    Survival Plots.

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    <p>Solid line: PRE period, dashed line: POST period.</p

    Additional file 1 of Sonometric assessment of cough predicts extubation failure: SonoWean—a proof-of-concept study

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    Additional file 1. Supplemental Fig 1: Description of the Pulsar Model 14Âź Sound Level Meter and method for measurement. The Model 14 is a general purpose digital sound level meter which meets the full requirements of IEC 61672 to Class 2. Before each inclusion the Sound Level Meter was calibrated acoustically using an external reference, i.e the Sound Level Calibrator Model 106, which is placed over the microphone. The calibrator generates a stabilized Sound Pressure Level of 94dB (+- 0.3dB) at a frequency of 1 kHz. Using a Low range (Low = 35dB to 100dB), maximum sound level was measured pressing the MAX HOLD button for at least Âœ second and was ultimately noticed. A level of sound in decibels (L) is defined as ten times the base-10 logarithm of the ratio between two power-related quantities I (i.e cough-volume related sound) and Io (i.e the human hearing threshold) as follows: L = 10 * Log 10 (I/ Io). Thus, an apparent mild increase from 73 to 76 dB in sound level results in multiplying acoustic energy by a factor two
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