1988 Compilation of Elemental Concentration Data for USGS DTS‐1, G‐1, PCC‐1 and W‐1

Gladney, Ernest S.; Jones, Elizabeth A.; Nickell, Eric J.; Roelandts, Iwan

doi:10.1111/j.1751-908x.1991.tb00114.x

Cited by 49 publications

(40 citation statements)

References 11 publications

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“…The compiled data were first processed by applying all thirty-three discordancy tests at 95% confidence level through DODESSYS software (Verma and Díaz-González, 2012). This confidence level was chosen to make comparable the multiple test method of used here with the "two standard deviation method" practiced by Gladney et al (1991). The statistical results from the outlier-free data of G-1 (for the same chemical elements as for G-2) are summarised in Table 9.…”

Section: Geochemical Reference Materials Granite G-1 From Usamentioning

confidence: 99%

“…Verma, 2005, H 0 will be accepted and H 1 will be rejected, whereas in the light of the new interpolated critical value obtained from the best-fit equation (Table 4 or ES4), H 0 will be rejected and H 1 will be accepted. On the other hand, for Trial 2 (results of two analysts; Table 7), H 0 will be accepted and H 1 will be rejected according to the literature critical values (Miller and Miller, 2005;Verma, 2005), but H 0 will be rejected and H 1 will be ac- was applied to these data ( Gladney et al (1991). This implies that the multiple test method of practiced here performs better (provides less dispersion) than the two standard deviation method used by Gladney et al (1991).…”

Section: Chemistrymentioning

confidence: 99%

“…On the other hand, for Trial 2 (results of two analysts; Table 7), H 0 will be accepted and H 1 will be rejected according to the literature critical values (Miller and Miller, 2005;Verma, 2005), but H 0 will be rejected and H 1 will be ac- was applied to these data ( Gladney et al (1991). This implies that the multiple test method of practiced here performs better (provides less dispersion) than the two standard deviation method used by Gladney et al (1991). The application of t test showed that none of the mean values obtained in the present work was significantly lower or higher than the literature values at 95% confidence level.…”

Section: Chemistrymentioning

confidence: 99%

“…The geochemical data for granite G-1 were compiled from a published report by Gladney et al (1991). These authors applied the so called "two standard deviation method" to eliminate discordant observations and also reported their "recommended" or "consensus" values for different elements.…”

Section: Geochemical Reference Materials Granite G-1 From Usamentioning

confidence: 99%

“…Geochemical data for major-and trace-elements in RM are generally obtained from the application of different analytical methods in laboratories worldwide (e.g., Gladney et al, 1991Gladney et al, , 1992Imai et al, 1995;Velasco-Tapia et al, 2001;Marroquín-Guerra et al, 2009;Pandarinath, 2009a).…”

Section: Geochemical Reference Materials Granite G-1 From Usamentioning

confidence: 99%

See 4 more Smart Citations

Alternative approach for precise and accurate Student´s t critical values and application in geosciences

Verma

Cruz-Huicochea

2013

Journal of Iberian Geology

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We applied an alternative Monte Carlo simulation approach to obtain precise and accurate critical values (with 3 to 8 decimal places) for the Student´s t test for normal samples of degrees of freedom up to 6000 and for two-sided confidence levels of 50% to 99.9% and correspondingly for one-sided confidence levels of 75% to 99.95%. As an innovation, unlike the existing literature precision estimates of critical values are also individually reported. Prior to our work, critical values (with 2 or 3 decimal places) were available in tables in the published literature. Twenty-eight regression models were evaluated to obtain the best regression fitting of the tabulated data. All conventional polynomial (from quadratic up to 8th order) regressions failed for this purpose. New equations based on double or triple natural logarithm-transformations are proposed for all not-tabulated degrees of freedom, including fractional values if required as well as for probability computations. More importantly, we suggest that these kinds of log-transformations are likely to be useful for all cases where conventional polynomial regressions fail to perform satisfactorily. To demonstrate the utility of these new critical values and best-fit equations, we provide specific examples of applications in geochemistry, chemistry and medicine. The probability estimates, obtained from the present explicit approach, are consistent with commercial and freely available software. Additionally, a more extensive application of our t values is given for processing inter-laboratory data for geochemical reference materials granites G-1 and G-2 from U.S.A. as well as for evaluating geochemical data for basic rocks from the Canary and Azores Islands.Keywords: Monte Carlo simulation, Student t test, polynomial regressions, statistical method, geochemical reference material. ResumenAplicamos un método de simulación alterno tipo Monte Carlo para obtener valores críticos precisos y exactos de t de Student (de 3 a 8 puntos decimales) para muestras normales con grados de libertad hasta 6000 y para niveles de confianza de dos colas de 50% a 99.9% y por consecuencia, para niveles de confianza de una cola de 75% a 99.95%. Como una innovación, se reporta en forma individual la precisión de los valores críticos, lo cual no sucede en la literatura publicada. Previo a nuestro trabajo, en las tablas de la li-32

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Section: Geochemical Reference Materials Granite G-1 From Usamentioning

confidence: 99%

Section: Chemistrymentioning

confidence: 99%

Section: Chemistrymentioning

confidence: 99%

Section: Geochemical Reference Materials Granite G-1 From Usamentioning

confidence: 99%

Section: Geochemical Reference Materials Granite G-1 From Usamentioning

confidence: 99%

See 3 more Smart Citations

Alternative approach for precise and accurate Student´s t critical values and application in geosciences

Verma

Cruz-Huicochea

2013

Journal of Iberian Geology

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Main Geochemical Signatures Related to Meteoritic Impacts in Terrestrial Rocks: A Review

2003

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The chemical composition of impact melt rocks, breccias and ejecta layers is dominated mainly by the proportions and composition of target rocks. However, small quantities of vaporized and molten meteorite material mixed with them significantly alter the concentrations and ratios of certain elements and isotopes. The identification of this meteoritic signature is used to propose an impact formation for structures of uncertain origin, as well as a possible criterion for infemng the impactor type. The most common criteria applied to these studies are the detection of a positive siderophile element anomaly, the Re-Os isotopic

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Two decades with PIXE spectrometry at the University of Liège

Roelandts

Weber

1999

J Radioanal Nucl Chem

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The different important stages of the development of proton induced X-ray emission (PIXE) spectrometry utilised with success since 1976 at Liege University are outlined. The methodological efforts (irradiation, target preparation, calibration, matrix effect corrections) to improve quantitative trace element analysis are emphasized. Examples of applications in geological, biomedical and environmental sciences are selected in order to illustrate the potential of the technique in these fields.

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1988 Compilation of Elemental Concentration Data for USGS DTS‐1, G‐1, PCC‐1 and W‐1

Cited by 49 publications

References 11 publications

Alternative approach for precise and accurate Student´s t critical values and application in geosciences

Alternative approach for precise and accurate Student´s t critical values and application in geosciences

Main Geochemical Signatures Related to Meteoritic Impacts in Terrestrial Rocks: A Review

Two decades with PIXE spectrometry at the University of Liège

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