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Table 2.
Summary of generalized linear model results assessing the effects of application type (KTW, Keuwlsoft and Bolden), sound pressure level (Loudness), device ID, frequency, and pseudo-calibration status on SPL measurement differences from a standard SLM meter.
| Term | Estimate | Std. Error | t value | Pr(> |t|) |
|---|---|---|---|---|
| (Intercept) | −2.186370 | 0.816466 | −2.678 | 0.008230 |
| KTW | −1.057913 | 0.791175 | −1.337 | 0.183187 |
| Keuwlsoft | 2.883210 | 0.771488 | 3.737 | 0.000263 |
| Loudness | 0.044063 | 0.006087 | 7.239 | 2.13e−11 |
| Device | −0.913715 | 0.560684 | −1.630 | 0.105261 |
| Frequency | 0.087583 | 0.078929 | 1.110 | 0.268913 |
| Pseudo-calibration | 1.100097 | 0.782767 | 1.405 | 0.161958 |
| KTW × Device | 1.035711 | 0.597526 | 1.733 | 0.085078 |
| Keuwlsoft × Device | 5.527259 | 0.586548 | 9.423 | < 2e−16 |
| KTW × Frequency | 0.310508 | 0.105203 | 2.952 | 0.003668 |
| Keuwlsoft × Frequency | −0.398091 | 0.102310 | −3.891 | 0.000149 |
| Device × Frequency | −0.107445 | 0.060214 | −1.784 | 0.076369 |
| KTW × Pseudo-calibration | −1.230312 | 1.112390 | −1.106 | 0.270482 |
| Keuwlsoft × Pseudo-calibration | −2.854431 | 1.105030 | −2.583 | 0.010740 |
| Device × Pseudo-calibration | 1.554114 | 0.592343 | 2.624 | 0.009592 |
| Frequency × Pseudo-calibration | −0.011144 | 0.105022 | −0.106 | 0.915637 |
| KTW × Device × Pseudo-calibration | −1.125539 | 0.845215 | −1.332 | 0.184978 |
| Keuwlsoft × Device × Pseudo-calibration | −5.615112 | 0.841387 | −6.674 | 4.45e−10 |
| KTW × Frequency × Pseudo-calibration | −0.011710 | 0.147883 | −0.079 | 0.936992 |
| Keuwlsoft × Frequency × Pseudo-calibration | 0.389246 | 0.147810 | 2.633 | 0.009333 |
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