Estimating Measures of Location and Scale

Wilcox, Rand R.

doi:10.1016/b978-0-12-820098-8.00009-9

Cited by 7 publications

(4 citation statements)

References 63 publications

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“…These coherence and pressure criteria are consistent with our previous practice in Wang and Tanimoto (2020). To better ensure the robustness of our analysis, we apply a 20% trimmed mean method (e.g., Wilcox, 2012) to exclude outliers. By definition, we exclude 20% of both ends of sorted coherent PSDs.…”

Section: Discussionmentioning

confidence: 99%

“…“kh” and “kz” fields in Tables 1 and 2 are numbers of one‐hour coherent and high‐pressure time intervals for the entire duration of two stations for both horizontal and vertical components. The remaining columns are computed using Equations 1–3 with a 20% trimmed mean approach (e.g., Wilcox, 2012). Standard deviations are estimated from the distribution of coherent data segments (see green points in Figure 2).…”

Section: Discussionmentioning

confidence: 99%

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Estimation of Vs30 at the EarthScope Transportable Array Stations by Inversion of Low‐Frequency Seismic Noise

Wang

Tanimoto

2022

JGR Solid Earth

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The interaction between the atmosphere and the solid Earth through surface pressure variations can be quantified by analyzing low-frequency seismic data with collocated pressure data, particularly data in the frequency band between 0.01 and 0.05 Hz (e.g., Sorrells, 1971; Tanimoto & Wang, 2018). Sorrells (1971) proposed the theoretical framework where the excitation mechanism is wind-related pressure waves that move along the surface and cause ground deformation recorded by broadband seismic sensors. We examine the propagating plane-wave pressure wave model in details by quantitively analyzing collocated wind data in Tanimoto and Wang (2021), and find that the assumption is reasonable when pressure variations are large. Similar principles are also applicable in ocean-bottom-seismometers compliance studies (Crawford et al., 1991) and in evaluating near-surface structure on Mars (Kenda et al., 2017). Expanding on the work of Sorrells (1971), we can use the ratios of collocated seismic and pressure data to estimate the subsurface elastic structure at collocated stations. Better understanding of near-surface structure is important for seismic site effects and ground motion prediction studies (e.g., Borcherdt, 1994; Sánchez-Sesma & Crouse, 2015;Trifunac, 2016). The procedure for retrieving half-space structure at fixed frequencies has been demonstrated and applied to estimate half-space structure at 784 USArray Transportable Array (hereafter TA) stations (Wang & Tanimoto, 2020).Although the half-space approach provides estimates of near-surface structure in a straightforward manner, it lacks depth constraints that are essential for site effects parameters, such as Vs30. Vs30 is the time-averaged shear-wave velocity from the surface to 30 m below, and it is one of the primary quantities for ground motion prediction studies (e.g., Dobry et al., 2000). In order to estimate Vs30 for a layered structure beneath a station, we

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Estimation of Vs30 at the EarthScope Transportable Array Stations by Inversion of Low‐Frequency Seismic Noise

Wang

Tanimoto

2022

JGR Solid Earth

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“…The exclusion criteria were as follows: (1) patients with glaucoma, diabetic fundus disease or other eye diseases or the manual intraocular lens used in surgery which was a disposable intraocular lens implantation system. (2) Abnormal time were screened based on InterQuartile Range [ 13 ] (IQR) principle. Abnormal time greater than the sum of the upper quartile and 1.5 times IQR were excluded.…”

Section: Methodsmentioning

confidence: 99%

The impact of preloaded intraocular lens implantation system (TECNIS iTec®) in routine cataract surgery in China: a time-motion analysis

et al. 2023

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Objective To evaluate the impact on surgical efficiency and labor time cost of preloaded intraocular lens (IOL) implantation system compared with manual IOL implantation system in age-related cataract surgery in China. Methods This study was an observational, multicenter, prospective time-motion analysis. IOL preparation time, operation time, cleaning time, number and cost of cataract surgeries in eight participating hospitals were collected. The linear mixed model was used to explore factors associated with the difference in operation time between the preloaded IOL implantation system and the manual IOL implantation system. A time-motion model was constructed to convert the operation time cost saved by using preloaded IOL into economic benefits from hospital and social perspective, respectively. Results There were 2,591 cases included in the study (preloaded IOL: 1,591 cases; manual IOL: 1,000 cases). The preloaded IOL implantation system was significant time-saving in both preparation time and operation time compared to the manual IOL implantation system (25.48s vs. 47.04s, P < 0.001 and 353.84s vs. 367.46s, P = 0.004, respectively). An average total of 35.18s can be saved by using preloaded IOL per procedure. The results of linear mixed model showed that the type of IOL was the main factor leading to the difference in preparation time between preloaded IOL and manual IOL implantation system. By switching from manual IOL to preloaded IOL, the model projected additional 392 surgeries can be performed each year and an increase in revenue of $565,282 per hospital, a 9% increase from hospital perspective. And the annual productivity loss saved by using preloaded IOL was $3,006 in eight hospitals from perspective of society. Conclusion Compared with manual IOL implantation system, the preloaded IOL implantation system reduces lens preparation time and operation time, which increases potential surgical volume and revenue, and reduces the loss of work productivity. This study provides real-world evidence to support the advantages of the preloaded IOL implantation system in improving efficiency of ophthalmic surgery in China.

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“…The oxygen saturation values can be described by the normal distribution. One measure of variability is the interquartile range, IRQ, which describes the range of the middle half of the dataset, that is, the distance between the first quartile Q1 and the third quartile Q3 [ 24 ].…”

Section: Decision Algorithmmentioning

confidence: 99%

Wearable Pulse Oximeter for Swimming Pool Safety

Kałamajska

Misiurewicz

Weremczuk

2022

Sensors

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The purpose of this research was to develop an algorithm for a wearable device that would prevent people from drowning in swimming pools. The device should detect pre-drowning symptoms and alert the rescue staff. The proposed detection method is based on analyzing real-time data collected from a set of sensors, including a pulse oximeter. The pulse oximetry technique is used for measuring the heart rate and oxygen saturation in the subject’s blood. It is an optical method; subsequently, the measurements obtained this way are highly sensitive to interference from the subject’s motion. To eliminate noise caused by the subject’s movement, accelerometer data were used in the system. If the acceleration sensor does not detect movement, a biosensor is activated, and an analysis of selected physiological parameters is performed. Such a setup of the algorithm allows the device to distinguish situations in which the person rests and does not move from situations in which the examined person has lost consciousness and has begun to drown.

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Estimating Measures of Location and Scale

Cited by 7 publications

References 63 publications

Estimation of Vs30 at the EarthScope Transportable Array Stations by Inversion of Low‐Frequency Seismic Noise

Estimation of Vs30 at the EarthScope Transportable Array Stations by Inversion of Low‐Frequency Seismic Noise

The impact of preloaded intraocular lens implantation system (TECNIS iTec®) in routine cataract surgery in China: a time-motion analysis

Wearable Pulse Oximeter for Swimming Pool Safety

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