Alpha coefficient - Factbites

Alpha coefficient - Factbites
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Topic: Alpha coefficient

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	LIGO S2 Calibration: Alpha, Beta coefficients
		There probably are fluctuations in the alpha coefficient with faster time scales, which may be of order 10%.
		Histograms of alpha*beta coefficients, unity gain frequencies and phase margin during science times: L1, H1, H2.
		Finally, we calculate the alpha coefficient dividing the solution to the equation above by the corresponding value of beta.
	www.phys.lsu.edu /faculty/gonzalez/S2Calibration (1632 words)

	Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations
		The equilibrium requirement {nabla}xB={alpha}B for the Maxwell stresses in a magnetic field B has the curious property that the torsion coefficient {alpha} is constant along every individual field line (B{center_dot}{nabla}{alpha}=0) but is completely unrelated from one field line to the next.
		The magnetic fields to be seen in nature sometimes have untidy internal field topologies because of the interlacing of their field lines by convection of their footpoints.
	www.osti.gov /energycitations/product.biblio.jsp?osti_id=20551358 (279 words)

	Citations: User involvement and user satisfaction: An exploratory contingency model - Amoako-Gyampah, White (ResearchIndex)
		alpha coefficient most frequently [61] Furthermore, some researchers consider the Cronbach alpha coefficient to be the most important [58] Examples of instruments with reported Cronbach alpha coefficients are those for measuring user information satisfaction [38] 62] user involvement [5]
		Previous research has investigated the effect of the interaction between user participation and uncertainty on IS success.
		[75] The model that we propose in this paper is also a contingency model, however, our outcome variable is RE success and not IS success.
	citeseer.ist.psu.edu /context/251725/0 (279 words)

	Summary
		The reason for the large number of unclear correlations in the study of distance of the flare from an alpha inversion is that there is a small bug in the program that calculates the spearman correlation when the number of elements in the arrays to be correlated is between 20,000 and 30,000.
		One of the important correlations from this is that the variance of alpha and the mean of Bz are related through a mutual correlation with the number of pixels in the magnetogram.
		In fact, we found using a spearman's correlation that the coefficient for this correlation is 0.966 with a significance of 0.00.
	solar.physics.montana.edu /www/hahn/NEWSTUFF/Summary (5192 words)

	WWWFinance - Asset Pricing and Risk Management: Campbell R. Harvey
		The alpha is the intercept in the regression.
		The coefficient in the linear relation is the asset's beta or the ratio of the conditional covariance with the market to the conditional variance of the market.
		This is a regression that allows us to estimate the stock's beta coefficient.
	www.duke.edu /~charvey/Classes/ba350/riskman/riskman.htm (3012 words)

	Homework 7
		Calculate the alpha transmission coefficient and the decay constant
		For a non constant potential barrier the expression for the transmission coefficient found in part (b) can be used as a guide.
		(a) Calculate the transmission coefficient for a particle with mass m and kinetic energy E passing through the rectangular potential barrier
	electron6.phys.utk.edu /qm1/homework/homework7.htm (173 words)

	Neuroscience-Net - Physiology Section Article #10001
		An EC50 of 85 uM and a Hill coefficient of 2.5 were calculated for oocytes expressing the alpha
		receptor, with an EC50 of 142 uM and a Hill coefficient of 2.29.
		Hill coefficients and EC50s fall within the range of that previously reported for recombinant glycine receptors (Taleb and Betz, 1994; Bormann et al., 1993; Cascio et al., 1993; Langosch et al., 1990).
	www.neuroscience.com /physio01/htm/main.html (4786 words)

	Probability and Statistics Resources
		Feldt L., A test of the hypothesis that Cronbach's alpha reliability coefficient is the same for two tests administered to the same sample, Psychometrika, 45, 1080, 99-105.
		Barchard K., and A. Hakstian, The robustness of confidence intervals for coefficient alpha under violations of the assumption of essential parallelism, Multivariate Behavioral Research, 32, 1997, 169-191.
		Clogg, Petkova, and Haritou, Statistical methods for comparing regression coefficients between models, American Journal of Sociology, 100, 1995, 1261-1293.
	home.ubalt.edu /ntsbarsh/Business-stat/R.htm (4786 words)

	Alpha - Wikipedia, the free encyclopedia
		Alpha (Investment), a coefficient measuring the risk-adjusted performance, considering the risk due to the specific security, rather than the overall market.
		Alpha is often used as an adjective to indicate the first or most significant occurrence of something, as in alpha male or alpha version.
		Alpha is used in the Christian New Testament to refer to God as the beginning of all things.
	en.wikipedia.org /wiki/Alpha (597 words)

	Alpha - Wikipedia, the free encyclopedia
		Alpha (Investment), a coefficient measuring the risk-adjusted performance, considering the risk due to the specific security, rather than the overall market.
		Alpha is often used as an adjective to indicate the first or most significant occurrence of something, as in alpha male or alpha version.
		Alpha is used in the Christian New Testament to refer to God as the beginning of all things.
	en.wikipedia.org /wiki/Alpha (597 words)

	Alpha - Wikipedia, the free encyclopedia
		Alpha (Investment), a coefficient measuring the risk-adjusted performance, considering the risk due to the specific security, rather than the overall market.
		Alpha is often used as an adjective to indicate the first or most significant occurrence of something, as in alpha male or alpha version.
		Alpha was the first name used for a subtropical storm in the Atlantic tropical basin when these were named according to the NATO phonetic alphabet in 1972 and 1973.
	en.wikipedia.org /wiki/Alpha (601 words)

	Webb and Associates
		For statisticians, the alpha coefficient in the a intercept in the regression equation y = a + bx, the same equation used to calculate the beta coefficient.
		The beta coefficient is a measure of the security's volatility relative to the market.* Since beta reflects only the market-related portion of a security's risk, it is a narrower measure than standard deviation, which reflects total risk (both market-related and unique).
		Beta can be interpreted, roughly, as the percentage performance of the security which has historically accompanied a 1% move in the relative index.
	www.webbandassoc.com /glossary_ext.htm (6243 words)

	Alpha - Wikipedia, the free encyclopedia
		Alpha (Investment) - A coefficient measuring the risk-adjusted performance, considering the risk due to the specific security, rather than the overall market.
		Humans and their nearest species-relatives, the chimpanzees, show deference to the alpha of the community by ritualized gestures such as bowing, allowing the alpha to walk first in a procession, or standing aside when the alpha challenges.
		alpha version or alpha release - the first release of a computer program or other product, likely to be very unstable but useful for demonstrating internally and to select customers.
	en.wikipedia.org /wiki/Alpha (6243 words)

	Temperature coefficient of resistance - Chapter 12: THE PHYSICS OF CONDUCTORS AND INSULATORS - Volume I - DC
		The "alpha" (α) constant is known as the temperature coefficient of resistance, and symbolizes the resistance change factor per degree of temperature change.
		For some metal alloys, the temperature coefficient of resistance is very close to zero, meaning that the resistance hardly changes at all with variations in temperature (a good property if you want to build a precision resistor out of metal wire!).
		A negative coefficient for a material means that its resistance decreases with an increase in temperature.
	www.allaboutcircuits.com /vol_1/chpt_12/6.html (6243 words)

	Buy Direct - Thermistors, Pt RTD Elements, Temperature Sensors
		The larger Alpha or Beta the greater the change in resistance with temperature, and the temperature versus resistance curve is steeper.
		The resistance of NTC thermistors decreases with increasing temperature.
		The emf is generated when a temperature gradient exists between this wire junction and a reference junction.
	www.sensorsci.com /thermistors_rtd_thermocouples.htm (6243 words)

	Alpha Temperature Coefficient - BetaTHERM Sensors Temperature Solutions
		The approach of using temperature coefficient values is adequate provided that accurate alpha values and resistance values are available for a range of temperature points for the thermistor materials.
		For Negative Temperature Coefficient (NTC) Thermistors, typical values of alpha are in the range -3%/°C to -6%/°C. The temperature coefficient is a basic concept in thermistor calculations.
		Alpha is also referred to as the temperature coefficient.
	www.betatherm.com /alpha.htm (6243 words)

	Method and a six port network for use in determining complex reflection coefficients of microwave networks - Patent 4521728
		is the complex reflection coefficient associated with the microwave network,.alpha.
		Geometrically, equation (1) is the equation of a circle in the complex reflection coefficient plane.
		The working principle of the known six port reflectometer is based on that an unknown complex reflection coefficient can be determined by four microwave power measurements and obtained at the intersection of three circles drawn from these four power measurements in the complex reflection coefficient plane.
	www.freepatentsonline.com /4521728.html (5952 words)

	Max-Planck-Institut für
		Bhattacharya, J. and P.P. Kanjilal: Revisiting the role of correlation coefficient to distinguish chaos from noise.
		Bhattacharya, J.P, P.P.Kanjilal and S.H. Nizamie: Decomposition of posterior alpha rhythm.
		Soff: Resummation of QED Perturbation Series by Sequence Transformations and the Prediction of Perturbative Coefficients.
	www.mpipks-dresden.mpg.de /library/Preprints_2000.htm (5952 words)

	Priestley-Taylor Alpha Coefficient: Variability and Relationship to NDVI in Arctic Tundra Landscapes
		Priestley-Taylor Alpha Coefficient: Variability and Relationship to NDVI in Arctic Tundra Landscapes
		Average daily values of the Priestley-Taylor coefficient () were calculated for two eddy covariance (flux) tower sites with contrasting vegetation, soil moisture, and temperature characteris- tics on the North Slope of Alaska over the 1994 and 1995 growing seasons.
		Because variations in have been shown to be associated with changes in vegetation, soil moisture, and meteorological condi- tions in Arctic ecosystems, we hypothesized that values would be significantly different between sites.
	www.awra.org /jawra/papers/J01172.html (252 words)

	glosb.html
		Specifically, the alpha error probability of erroneously accepting the observed correlation coefficient as not-equal-to-zero when in fact (in the population) it is equal to zero may be much larger than.05 in this case.
		The Beta coefficients are the regression coefficients you would have obtained had you first standardized all of your variables to a mean of 0 and a standard deviation of 1.
		Thus, the advantage of Beta coefficients (as compared to B coefficients which are not standardized) is that the magnitude of these Beta coefficients allow you to compare the relative contribution of each independent variable in the prediction of the dependent variable.
	www.statsoft.com /textbook/glosb.html (252 words)

	Nuclear Structure Laboratory, Publications
		"New Limit on the D Coefficient in Polarized Neutron Decay," L.J. Lising, S.R. Hwang, J.M. Adams, J.M. Anaya, T.J. Bowles, T.E. Chupp, K.P. Coulter, M.S. Dewey, S.J. Freedman, B.K. Fujikawa, A. García, G.L. Greene, G.L. Jones, H.P. Mumm, J.S. Nico, R.G.H. Robertson, T.D. Steiger, W.A. Teasdale, A.K. Thompson, E.G. Wasserman, F.E. Wietfeldt, J.F. Wilkerson, Phys.
		"Shape of the 8B alpha and neutrino spectra," C.E. Ortiz, A. García, R. Waltz, M. Bhattacharya, and A. Komives, Phys.
		"A Measurement of Gamow-Teller Strength for 176Yb ® 176Lu and the Efficiency of a Solar Neutrino Detector," M. Bhattacharya, C.D. Goodman, R.S. Raghavan, A. García, M. Palarczyk, J. Rapaport, I.J. van Heerden, P. Zupranski, Phys.
	www.nd.edu /~nsl/Publications/publications.html (252 words)

	Journal of the American Water Resources Association: Priestely-Taylor alpha coefficient: Variability and relationship to NDVI in arctic tundra landscapes
		ABSTRACT: Average daily values of the Priestley-Taylor coefficient (alpha) were calculated for two eddy covariance (flux) tower sites with contrasting vegetation, soil moisture, and temperature characteristics on the North Slope of Alaska over the 1994 and 1995 growing seasons.
		The PT model has been shown to provide acceptable accuracy for predicting daily evaporation in Arctic ecosystems if the value of the a coefficient is known (Rouse et al., 1977).
		Because variations in ct have been shown to be associated with changes in vegetation, soil moisture, and meteorological conditions in Arctic ecosystems, we hypothesized that alpha values would be significantly different between sites.
	www.findarticles.com /p/articles/mi_qa4038/is_200212/ai_n9149542 (1187 words)

	IAEA1401: ZZ DROSG-2000, Legendre Coefficient Library for 59 monoenergetic neutron source reactions
		3) Some (exotic) monoenergetic (d,n) reactions and (alpha,n) reactions and their inverse reactions were added.
		This program calculates differential cross sections and energies of some (n,p), (n,d), (n,t) and (n,alpha) reactions by detailed balance from the time reversed reactions covered under 1).
		As an option, a white spectrum at a chosen angle ready for plotting is produced.
	www.nea.fr /abs/html/iaea1401.html (1187 words)

	materiaLAB - online!publications : Anisotropic thermal expansion causes deformation of marble claddings
		The graphs of the coefficient of thermal expansion alpha as a function of temperature show a decrease in gradient at about 100°C. This decrease indicates that most of the irreversible effects have already happened before heating up to that temperature.
		Although frequently just one coefficient for thermal expansion is specified in literature, this is a rather dubious approach, as this coefficient varies with the direction of measurement and is a nonlinear function of temperature.
		This residual dilatation can be explained by means of the thermal anisotropy of the calcite grains in connection with the natural preferred orientation in marble rocks: the grains are orientated in such a way that their crystallographic c-axes are predominantly parallel to the direction of the maximum thermal expansion of marble.
	atpmw3.tuwien.ac.at /materiaLAB/OnlinePublications/Online/Widhalm.Marble.ThermalExpansion/comments.html (1187 words)

	R: Asymptotic confidence intervals of Pearson correlation coefficient
		Pearson correlation coefficient estimate, can be single value or vector.
		This function returns confidence intervals for a list of Pearson correlation estimates given a sample size N and significant level alpha.
		The function returns asymptotic lower and upper bound(s) of Pearson correlation coefficient(s).
	www-personal.umich.edu /~zhud/genentov/cor.confint.html (1187 words)

	CO2Tab Product Information
		Coefficient of thermal expansion, ALPHA = r (V/T)P
		Viscosity (dynamic), MU Thermal conductivity, KT Surface tension, ST Prandtl number, PR Static dielectric constant, DC Isothermal Joule-Thomson coefficient, IJT
		Heat capacity at constant volume, CV Heat capacity at constant pressure, CP Speed of sound, W
	www.chemicalogic.com /co2tab/product_information.htm (1187 words)

	Chemistry: WebElements Periodic Table : Periodic properties : Linear expansion coefficient: Definition
		is the length at 273 K, alpha is the coefficient of linear thermal expansion, then the length at temperature t is given by:
		The coefficient of linear thermal expansion is the ratio of the change in length per degree K to the length at 273 K. Units
		The coefficient of volume expansion is about three times the linear coefficient.
	www.webelements.com /webelements/properties/text/definitions/coeff-thermal-expansion.html (249 words)

	materiaLAB - online!publications : Acoustic Emission and Anisotropic Expansion when Heating Marble
		"alpha" is the mean thermal expansion coefficient for the heating from "RT" to 50°C. The indices "max" and "min" denote the orientation of the specimens in the direction of maximum and minimum thermal expansion respectively.
		After the first heating-cooling cycle a permanent elongation was observed.
		When heating the specimens again to the same maximum temperature, no further residual dilatations occurred (see Table 1).
	atpmw3.tuwien.ac.at /materiaLAB/OnlinePublications/Online/Widhalm.Marble.AnisotropicExpansion/results.html (249 words)

	Lecture Five
		We must note here that alpha, thermal expansion coefficient is greatest for a gas, then comes the liquid and then a solid.
		One must also be aware of the influence of the pressure dependence of the viscosity on the thermal history as well, so far this has not been explored in great depth.
		This can also lead to positive feedback from temperature dependence of Q (exponential dependence on T) and thermal runaway (melting) Tidal dissipation is responsible for volcanism observed in Io (predictions made before the arrival of Pioneer in 1979 by Pat Cassen at NASA Ames) and other icy planets.
	www.msi.umn.edu /~davey/lecture4.htm (2142 words)

	A comparison of consensus, consistency, and measurement approaches to estimating interrater reliability. Stemler, Steven E.
		Cronbach’s alpha coefficient is a measure of internal consistency reliability and is useful for understanding the extent to which the ratings from a group of judges hold together to measure a common dimension.
		The Spearman rank coefficient provides an approximation of the Pearson correlation coefficient, but may be used in circumstances where the data under investigation are not normally distributed.
		In this case, then, since both ratings being correlated are in the form of rankings, a correlation coefficient can be computed that is governed by the number of pairs of ratings (Glass and Hopkins, 1996).
	pareonline.net /getvn.asp?v=9&n=4 (6903 words)

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In the News (Tue 29 Dec 09)