Results 251 to 260 of about 9,997,446 (295)

A factorial analysis of sex ratio data

Annals of Human Genetics, 1961
SummaryThe application of a factorial analysis of x2 to sex ratio data is discussed. It is shown how such an analysis resolves the main sources of variation in binomial data. Some extensive data are treated by this method, and it is concluded that they provide good evidence for a positive association between the sexes of successive children in a family.
openaire   +2 more sources

Ratio Variables in Aggregate Data Analysis

Sociological Methods & Research, 1979
This article discusses three different uses of ratio variables in aggregate data analysis: (1) as measures of theoretical concepts, (2) as a means to control an extraneous factor, and (3) as a correction for heteroscedasticity. In the use of ratios as indices of concepts, a problem can arise if it is regressed on other indices or variables that ...
Bollen, Kenneth A, Ward, Sally
openaire   +2 more sources

Generalized likelihood ratio tests for complex fMRI data

SPIE Proceedings, 2004
Functional magnetic resonance imaging (fMRI) intends to detect significant neural activity by means of statistical data processing. Commonly used statistical tests include the Student-t test, analysis of variance, and the generalized linear model test. A key assumption underlying these methods is that the data are Gaussian distributed.
Sijbers, J. (author), Den Dekker, A.J. (author)   +1 more
openaire   +4 more sources

Estimating the Herfindahl Index from Concentration Ratio Data

Journal of the American Statistical Association, 1985
Abstract High concentration ratio (C)—Herfindahl (H) index correlations found in United States studies may be biased upward by using estimated H. For New Zealand data, correlations between C and actual H are lower; the H—C relationship appears to be nonlinear.
Claudio Michelini, Michael Pickford
openaire   +1 more source

Paediatric normative data for urine NGAL/creatinine ratio

Acta Paediatrica, 2013
AbstractAimThe objective of this study was to establish age‐dependent urine NGAL (neutrophil gelatinase‐associated lipocalin)/creatinine ratio values in healthy children and adolescents.MethodsThe study was performed using a random sample of 172 healthy children and adolescents (M–88, F–84), aged median 9.75 (0.2–17.9) years.
Agnieszka, Rybi-Szumińska, Anna, Wasilewska, Miecyslaw, Litwin, Zbigniew, Kułaga, Michal, Szumiński   +4 more
openaire   +2 more sources

The Correlation Ratio for Ranked Data

Journal of the American Statistical Association, 1939
(1939). The Correlation Ratio for Ranked Data. Journal of the American Statistical Association: Vol. 34, No. 207, pp. 533-538.
openaire   +1 more source

EIGENANALYSIS OF SELECTION RATIOS FROM ANIMAL RADIO-TRACKING DATA

Ecology, 2006
The development of methods to analyze habitat selection when resources are defined by several categories (e.g., vegetation types) is a topical issue in radio-tracking studies. The White and Garrott statistic, an extension of the widely used test of Neu et al., can be used to determine whether habitat selection is significant. As well, Manly's selection
Calenge, C., Dufour, Anne-Béatrice
openaire   +3 more sources

Ratio-Based Gradual Aggregation of Data

2012
Majority of databases contain large amounts of data, gathered over long intervals of time. In most cases, the data is aggregated so that it can be used for analysis and reporting purposes. The other reason of data aggregation is to reduce data volume in order to avoid over-sized databases that may cause data management and data storage issues. However,
openaire   +1 more source

A TEST FOR SEGREGATION RATIOS IN FAMILY DATA

Annals of Human Genetics, 1956
SummaryA method is given for checking the agreement of the observed segregation of a character in family data, and the expected segregations calculated on the basis of Mendelian ratios and the Hardy‐Weinberg formulae. The method is only worked out in detail for the simple case of two alleles, one recessive to the other; in principle it could be ...
openaire   +2 more sources

GOLDEN RATIO IN ANTHROPOMETRIC DATA

2014
The term as golden ratio has been used in lots of area such as, architecture, art etc.. for a long time and it can be defined as a constant. In various investigations indicate that this ratio has been used in the livings anatomical designing and in nature itself.
openaire   +1 more source