1988 Compilation of Elemental Concentration Data for Usgs Agv‐1, Gsp‐1 and G‐2

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

doi:10.1111/j.1751-908x.1992.tb00492.x

Cited by 45 publications

(28 citation statements)

References 10 publications

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“…These results show excellent overall agreement with accepted values (Gladney et al, 1992); Ba is the only element whose concentration differs within analytical error.…”

Section: Methodssupporting

confidence: 78%

Data Report: Trace Element Geochemistry of Leg 142 Basalts by Instrumental Neutron Activation Analysis

Allan¹

1995

Proceedings of the Ocean Drilling Program, 142 Scientific Results

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During Leg 142, two units of moderately evolved basalt were recovered from the East Pacific Rise axis at 9°3θ'N. Instrumental neutron activation analysis of seven samples from these units shows them to be light rare-earth-element (REE)-depleted, normal mid-ocean ridge basalt, with (La/Sm) N of 0.52-0.56, flat chondrite-normalized medium-to-heavy rare earth patterns, and slight negative europium anomalies. Unit 2 contains slightly higher amounts of REE and Hf and lower amounts of Cr than Unit 1, with both units similar in composition to the most-evolved samples previously collected from this section of the ridge crest.

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“…These results show excellent overall agreement with accepted values (Gladney et al, 1992); Ba is the only element whose concentration differs within analytical error.…”

Section: Methodssupporting

confidence: 78%

Data Report: Trace Element Geochemistry of Leg 142 Basalts by Instrumental Neutron Activation Analysis

Allan¹

1995

Proceedings of the Ocean Drilling Program, 142 Scientific Results

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“…These results were compared with those reported by Verma and Cruz-Huicochea (2013) from the t test and by Gladney et al (1992) from the 2s method. We note that the comparison of the ANOVA, F-t, and 2s methods should, however, be better or more objectively performed if the ANOVA and F-t tests were applied at a less strict 95% confidence level.…”

Section: Comparison Of the Anova With F-t Tests And The Two Standard mentioning

confidence: 94%

“…This application therefore will allow the user to compare the results of application of ANOVA (this work) with the combined application of F and t tests (Verma and Cruz-Huicochea, 2013). Although it is customary to present major-element data as oxides, we have shown them as elements, because the compilation by Gladney et al (1992), which lists the data as elements, was used initially. Thus, because these authors had compiled the major-elements as elements (%), we continued their "unconventional" approach in this work.…”

Section: Evaluation Of Geochemical Data For International Reference Mmentioning

confidence: 99%

New critical values for F and their use in the ANOVA and Fisher’s F tests for evaluating geochemical reference material granite G-2 (U.S.A.) and igneous rocks from the Eastern Alkaline Province (Mexico)

Cruz-Huicochea

Verma

2013

Journal of Iberian Geology

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“…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%

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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1988 Compilation of Elemental Concentration Data for Usgs Agv‐1, Gsp‐1 and G‐2

Cited by 45 publications

References 10 publications

Data Report: Trace Element Geochemistry of Leg 142 Basalts by Instrumental Neutron Activation Analysis

Data Report: Trace Element Geochemistry of Leg 142 Basalts by Instrumental Neutron Activation Analysis

New critical values for F and their use in the ANOVA and Fisher’s F tests for evaluating geochemical reference material granite G-2 (U.S.A.) and igneous rocks from the Eastern Alkaline Province (Mexico)

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

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