On the Relationship of Least Squares to Cross-Correlation Quantitative Spectral Analysis

1983 ◽  
Vol 37 (6) ◽  
pp. 567-569 ◽  
Author(s):  
R. B. Lam
Keyword(s):  
Spectral Analysis ◽  
Least Squares ◽  
Cross Correlation ◽  
Quantitative Spectral Analysis ◽  
Relationship Of ◽  
The Relationship

Influence of Uncertain Demand on Product Variety: Evidence from the International Tourist Hotel Industry in Taiwan

2011 ◽  
Vol 17 (6) ◽  
pp. 1275-1285 ◽  
Author(s):  
Chiang-Ming Chen ◽  
Chia-Yu Yeh ◽  
Jin-Li Hu
Keyword(s):  
Least Squares ◽  
Demand Function ◽  
Hotel Industry ◽  
Product Variety ◽  
Random Coefficients ◽  
Uncertain Demand ◽  
International Tourist ◽  
Different Types ◽  
Relationship Of ◽  
The Relationship

Hotels provide many different types of rooms in terms of capacity as well as quality to diversify their products. This paper examines the relationship of uncertain demand and product variety by using monthly operation data from international tourist hotels in Taiwan during 2007–2009. First, the authors apply the two-stage least squares (2SLS) and random-coefficients models to estimate the demand function in Taiwan's international tourist hotel industry. They then examine the relationship between uncertain demand and product variety. The empirical results indicate that the market's uncertain demand significantly induces the hotels to expand their product variety.

The distribution of corticotectal projection neurons correlates with the interblob compartment in macaque striate cortex

1996 ◽  
Vol 13 (3) ◽  
pp. 461-466 ◽  
Author(s):  
Barry Lia ◽  
Jaime F. Olavarria
Keyword(s):  
Cross Correlation ◽  
Random Distribution ◽  
Striate Cortex ◽  
Projection Neurons ◽  
Chi Square ◽  
Cortical Projections ◽  
Cross Correlation Analysis ◽  
Chi Square Analysis ◽  
Relationship Of ◽  
The Relationship

AbstractWhile much attention has been given to the correlation between cytochrome-oxidase (CO) compartments and patterns of cortico-cortical projections originating from supragranular layers in the striate cortex, little is known in this regard about patterns of cortico-subcortical projections originating from infragranular cortex. We studied the tangential distribution of the striate cortex neurons projecting to the superior colliculus and used two approaches to analyze the relationship of this distribution to the arrangement of CO “blobs.” First, chi-square analysis indicated that significantly fewer labeled neurons were found within the CO blob compartment than the number expected for a random distribution. Second, spatial cross-correlation analysis – which circumvents the inherent subjectivity of delineating blob boundaries – revealed an area around blob centers in which there was a decreased probability of encountering labeled cells. The size of this area compared well with that of our outlines of CO blobs. We conclude that corticotectal projection neurons in the striate cortex are distributed preferentially within the interblob compartment of the infragranular striate cortex. These results demonstrate that the spatial distribution of cortico-subcortical projection neurons within infragranular cortex can correlate with the CO architecture of the primary visual cortex.

scholarly journals Simultaneous radar and spaced receiver VHF scintillation observations of ESF irregularities

2006 ◽  
Vol 24 (5) ◽  
pp. 1419-1427 ◽  
Author(s):  
D. Tiwari ◽  
B. Engavale ◽  
A. Bhattacharyya ◽  
C. V. Devasia ◽  
T. K. Pant ◽  
...  
Keyword(s):  
Cross Correlation ◽  
Spectral Width ◽  
Maximum Height ◽  
Plasma Bubble ◽  
Equatorial Spread F ◽  
Structure And Dynamics ◽  
Spread F ◽  
Vhf Scintillation ◽  
Relationship Of ◽  
The Relationship

Abstract. Simultaneous observations of equatorial spread F (ESF) irregularities made on 10 nights during March-April 1998 and 1999, using an 18-MHz radar at Trivandrum (77° E, 8.5° N, dip 0.5° N) and two spaced receivers recording scintillations on a 251-MHz signal at Tirunelveli (77.8° E, 8.7° N, dip 0.4° N), have been used to study the evolution of Equatorial Spread F (ESF) irregularities. Case studies have been carried out on the day-to-day variability in ESF structure and dynamics, as observed by 18-MHz radar, and with spaced receiver measurements of average zonal drift Vo of the 251-MHz radio wave diffraction pattern on the ground, random velocity Vc, which is a measure of random changes in the characteristics of scintillation-producing irregularities, and maximum cross-correlation CI of the spaced receivers signals. Results show that in the initial phase of plasma bubble development, the greater the maximum height of ESF irregularities responsible for the radar backscatter, the greater the decorrelation is of the spaced receiver scintillation signals, indicating greater turbulence. The relationship of the maximum spectral width derived from the radar observations and CI also supports this result.

The relationship of mindfulness and self-compassion to desired wildland fire leadership

2015 ◽  
Vol 24 (2) ◽  
pp. 201 ◽  
Author(s):  
Alexis L. Waldron ◽  
Vicki Ebbeck
Keyword(s):  
Least Squares ◽  
Partial Least Squares ◽  
Wildland Fire ◽  
Self Compassion ◽  
Path Modelling ◽  
Wildland Firefighting ◽  
Supervisor Leadership ◽  
Relationship Of ◽  
The Relationship ◽  
Modelling Approach

A quantitative approach was adopted to explore facets of mindfulness and self-compassion in relation to their ability to predict crewmembers’ perceptions of their supervisors’ leadership capabilities. The sample comprised 43 wildland fire crews consisting of their primary supervisors (n = 43) and crewmembers (n = 246). A partial least-squares path modelling approach was employed to test hypotheses regarding the relationships among mindfulness, self-compassion and leadership. Findings revealed that supervisor scores on mindfulness were significant predictors of crewmember-rated scores of supervisor leadership. Although not as strong, aspects of self-compassion were also significant predictors of perceived supervisor leadership. Unlike mindfulness, the aspects of self-compassion that predicted supervisor leadership were more varied between desirable self-compassion scores and undesirable self-compassion scores. Overall, the results indicate that mindfulness and self-compassion were predictors of desired wildland fire leadership by crewmembers; these results suggest potential functions that mindfulness and self-compassion could serve in the development of leaders in wildland firefighting.

Statistical appendix

1962 ◽  
Vol 59 (1) ◽  
pp. 63-66 ◽  
Author(s):  
R. C. Campbell
Keyword(s):  
Least Squares ◽  
Unit Area ◽  
Crop Plants ◽  
Iterative Calculation ◽  
Least Squares Fit ◽  
Image Position ◽  
Relationship Of ◽  
The Relationship

Bleasdale & Nelder (1960) refer to several models which have been used in studying the relationship of yield and density in crop plants and indicate that they regard as most satisfactory the equation:where ω = yield/plant, ρ = number of plants/unit area and A and B are constants. The estimation of the constants for any given case is a very unattractive arithmetic exercise requiring a fairly large number of observations and a tedious iterative calculation; Nelder (1961) has discussed the least squares fit with the equation in the formwhich may readily be derived from (1) by the substitutionsThe data in the present case do not justify attempting this process but some progress can be made by the substitutionsby means of which it is easy to derive from (1) that

Multivariate Least-Squares Methods Applied to the Quantitative Spectral Analysis of Multicomponent Samples

1985 ◽  
Vol 39 (1) ◽  
pp. 73-84 ◽  
Author(s):  
David M. Haaland ◽  
Robert G. Easterling ◽  
David A. Vopicka
Keyword(s):  
Spectral Analysis ◽  
Least Squares ◽  
Quantitative Spectral Analysis

scholarly journals Temperate glacier time response from field data

1993 ◽  
Vol 39 (132) ◽  
pp. 323-326 ◽  
Author(s):  
D. M. McClung ◽  
Richard L. Armstrong
Keyword(s):  
Mass Balance ◽  
Field Data ◽  
Cross Correlation ◽  
Climate Variations ◽  
Climate Zone ◽  
Local Climate ◽  
Glacier Terminus ◽  
Relationship Of ◽  
The Relationship ◽  
General Climate

AbstractThe relationship of glacier response due to mass-balance changes is of fundamental importance when climate variations are to be understood. In this paper, two aspects of the problem are analyzed from field data: (1) advance/retreat of the glacier terminus due to changes in mass balance, and (2) cross-correlation of mass-balance data from two glaciers in the same climate zone. The results show: (1) the terminus can respond quickly in accordance with expected minimum time-scale, and (2) two glaciers in the same general climate zone may have very different yearly mass balance and advance/retreat behaviour. This latter result indicates the importance of local climate variations.

scholarly journals The study of pituitary-thyroid hormones ratio based on regression analysis

2015 ◽  
Vol 96 (5) ◽  
pp. 831-837
Author(s):  
F Kh Kamilov ◽  
V N Kozlov ◽  
V N Baymatov ◽  
A N Mamtsev ◽  
D Yu Smirnov
Keyword(s):  
Body Weight ◽  
Regression Analysis ◽  
Thyroid Hormones ◽  
Least Squares ◽  
Least Squares Method ◽  
Thyroid Stimulating Hormone ◽  
Hormone Levels ◽  
Relationship Of ◽  
The Relationship ◽  
Stimulating Hormone

Aim. To work up a mathematical model for calculation of the levels of pituitary-thyroid hormones system by least squares method in rats with experimental hypothyroidism. Methods. To study the relationship of hormones levels regression analysis was used. The search of coefficients was performed using the least squares method. Investigations were carried out on rats, which were divided into six groups of 12 rats each: the first group was control, in the animals of second, third, fourth, fifth and sixth groups hypothyroidism was induced by daily intragastric administration of tiamazol in following doses: 2.5; 20.0; 10.0; 5.0 and 1.0 mg per 100 g of rat body weight for 3 weeks. Results. Regression analysis was carried out, the type of regression as well as parameters were chosen; statistical analysis of the relationship of hormones was conducted based on the obtained results. By comparing the calculation results of the laboratory analysis sufficiently high reliability of the developed model was set up. The deviation of the arithmetic mean value of the level of thyroid stimulating hormone, produced on the basis of experimental and calculated data, is 2.7%. The accuracy of thyroid stimulating hormone levels calculations increased with the decrease of thyrostatic medication dose. The relative error while calculating the free thyroxine levels in the same groups of rats did not exceed 2.15%, accounting for 1.64; 1.34; 0.36 and 2.15%, respectively, when administered daily 20.0; 10.0; 5.0 and 1.0 mg of antithyroid drug per 100 g body weight. One can argue about the reliability of the constructed model to reproduce the performance levels of the hormones of the pituitary-thyroid system. Conclusion. In the absence of modern high sensitive immunochemiluminescent diagnostic methods the results can be used for thyroid-stimulating hormone levels calculation as one of the major markers of the thyroid gland functional state.

scholarly journals From the First Spectral Analysis of Blood Pressure Variability in the World to the Present Time: Contribution of the Department of Physiology of the Faculty of Medicine, Masaryk University, Brno

2013 ◽  
pp. 341-350 ◽  
Author(s):  
Z. NOVÁKOVÁ
Keyword(s):  
Blood Pressure ◽  
Spectral Analysis ◽  
Baroreflex Sensitivity ◽  
Risk Index ◽  
Blood Pressure Measurement ◽  
Blood Pressure Regulation ◽  
Pressure Regulation ◽  
Prevention Of Hypertension ◽  
Relationship Of ◽  
The Relationship

The review shows the significance of blood pressure regulation studies conducted during several decades at the Department of Physiology, Faculty of Medicine, Masaryk University, Brno. Continuous non-invasive blood pressure measurement was first introduced and patented here and, with the obtained data, the first spectral analysis of blood pressure was performed. This method was used in many different physiological studies on the relationship of blood pressure regulation to circulatory parameters, breathing, and baroreflex sensitivity. The article deals with studies on risk stratification of sudden cardiac death according to decreased baroreflex sensitivity, 24-hour heart rate variability, the amount of extrasystoles and late potentials. Importance of the new method of determination of one summation risk index is described here. A summary of the new conception of the relationship between low baroreflex sensitivity and hypertension is presented. Here, not only pathological changes of the vessel wall but also increased sympathetic activity and genetic predisposition play a role. Importance of studies conducted in young adults is highlighted, as inherited BRS decrease contributes to earlier blood pressure increase in the young. This research is highly topical, since prevention of hypertension in childhood is possible. Recent studies are dedicated to blood pressure regulation in young diabetics.

Automated Analysis of Flour Extracts for Uric Acid and Its Correlation With Degree of Insect Defilement

1983 ◽  
Vol 66 (3) ◽  
pp. 625-631
Author(s):  
Raymond R Galacci
Keyword(s):  
Uric Acid ◽  
Least Squares ◽  
Sodium Acetate ◽  
Automated Analysis ◽  
Color Intensity ◽  
Automated Method ◽  
Straight Line ◽  
The Difference ◽  
Relationship Of ◽  
The Relationship

Abstract An automated method is described for quantitating uric acid in a sodium acetate extract of flour. The difference in color intensity developed in a flour extract treated with the enzyme uricase and one that is not treated is measured spectrophotometrically. A mean recovery of 97.1% was obtained for 50 g flour samples spiked with 1 mg uric acid. The method can measure as little as 50 ng uric acid in 50 g flour and is used to establish a correlation between the uric acid in the flour and the number of insect fragments and excreta pellets present. A 42-data point least squares straight line having a slope of 1.62 and a correlation coefficient of 0.750 (99.9-100% valid) is used to establish the relationship of uric acid to insect defilement.

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