Comparing models of intelligence in Project TALENT: The VPR model fits better than the CHC and extended Gf–Gc models

Intelligence ◽  
2012 ◽  
Vol 40 (6) ◽  
pp. 543-559 ◽  
Author(s):  
Jason T. Major ◽  
Wendy Johnson ◽  
Ian J. Deary
Keyword(s):  
Better Than ◽  
Model Fits

scholarly journals TESTING FOR REGIME SWITCHING IN SINGAPOREAN BUSINESS CYCLES

2005 ◽  
Vol 50 (01) ◽  
pp. 25-34 ◽  
Author(s):  
ROBERT BREUNIG ◽  
ALISON STEGMAN
Keyword(s):  
Model Selection ◽  
Business Cycles ◽  
Nonlinear Model ◽  
Regime Switching ◽  
Markov Switching ◽  
Markov Switching Model ◽  
Switching Model ◽  
Intended Use ◽  
Better Than ◽  
Model Fits

We examine a Markov-Switching model of Singaporean GDP using a combination of formal moment-based tests and informal graphical tests. The tests confirm that the Markov-Switching model fits the data better than a linear, autoregressive alternative. The methods are extended to allow us to identify precisely which features of the data are better captured by the nonlinear model. The methods described here allow model selection to be related to the intended use of the model.

Cast Demographics, Unobserved Segments, and Heterogeneous Switching Costs in a Television Viewing Choice Model

2000 ◽  
Vol 37 (2) ◽  
pp. 173-186 ◽  
Author(s):  
Ron Shachar ◽  
John W. Emerson
Keyword(s):  
Television Viewing ◽  
Switching Costs ◽  
Choice Model ◽  
Predictive Testing ◽  
Demographic Characteristics ◽  
Individual Characteristics ◽  
Scheduling Strategies ◽  
The Cost ◽  
Better Than ◽  
Model Fits

An accurate television viewing choice model is an important tool for television executives and advertisers. The authors present a new viewing choice model, which differs from the traditional Rust-Alpert model in three ways: (1) It introduces a new show characteristic—the demographic characteristics of a show's cast; (2) it allows the preferences over the traditional show categories to be a function of both observable and unobservable individual characteristics; and (3) it allows the cost of switching among the viewing alternatives to vary across show types and individual characteristics. Cross-validated predictive testing shows that this model fits the data better than the Rust–Alpert model does. Furthermore, the authors demonstrate that network executives can improve ratings by using this model. The authors predict that by following their scheduling strategies (in particular, by broadcasting comedies after 10:00 P.M.), ABC, CBS, and NBC could have increased their average ratings by 12.9%, 7.5%, and 6.7%, respectively, on selected evenings.

scholarly journals Essays on inequality and mobility of Korean households' income and consumption

2021 ◽  
Author(s):  
◽  
Sanguk Kwon
Keyword(s):  
Measurement Errors ◽  
Process Model ◽  
Panel Study ◽  
Correction Method ◽  
Permanent Income ◽  
Total Expenditure ◽  
Income Shocks ◽  
Current Income ◽  
Better Than ◽  
Model Fits

This dissertation analyzes income and consumption inequality empirically and theoretically using Korean Labor and Income Panel Study (KLIPS). This dissertation consists of three chapters. First two chapters are about detrended income and consumption excluding the effects of household's characteristics. Third chapter is about observed income and consumption. In the chapters 1 and 2, we track income and consumption of same cohort of Korean households over the lifecycle and find empirical evidences are not explained by existing income and consumption models with iid assumption of income shocks. For example, future cumulative gains in consumption (income) are negatively correlated with initial consumption (income). Second, consumption inequality does not grow over the lifecycle. At the chapter 1, we develop new income process model. Our suggesting generalized restricted income profiles (G-RIP) and stochastic heterogeneous income profile (SHIP) consider iid income shocks as well as household-specific factors of macroeconomy. We find that the estimated model fits the dynamics of inequalities and mobility of income better than the conventional RIP or HIP models. At the chapter 2, we develop new consumption process model. New consumption model has consumption shocks as well as household-specific uncertainty. Therefore, consumption risk is correlated with past consumption, which can explain the observed consumption moments. Our suggesting heterogeneous conditional mean (HCM) model fits the dynamics of inequalities and mobility of income and consumption better than the conventional model that assume iid income shocks. At the chapter 3, we deal with non-classical measurement errors in consumption using a double-differencing correction method. Aguiar and Bils (2015) develop a double differencing correction method to estimate the relative consumption inequality adjusted for measurement errors. In the first step they estimate Engel curve which measurement errors are correlated with error terms of and use current income as an instrument for total expenditure. This chapter provides an alternative instrument based on the permanent income hypothesis (PIH) for total expenditure. A long panel data is required to capture a household's permanent income and using a Korean household panel allows to test a hypothesis that permanent income could be more appropriate instrument than current income. We find the expected lifecycle income is better instrument than current income for current consumption.

scholarly journals A combined timing/spectral study of IRAS 13224-3809 using XMM–Newton data

2020 ◽  
Vol 498 (3) ◽  
pp. 3184-3192 ◽  
Author(s):  
M D Caballero-García ◽  
I E Papadakis ◽  
M Dovčiak ◽  
M Bursa ◽  
J Svoboda ◽  
...  
Keyword(s):  
Galactic Nuclei ◽  
Energy Spectra ◽  
Time Lags ◽  
X Ray ◽  
The Many ◽  
First Time ◽  
Variability Study ◽  
Eddington Limit ◽  
Better Than ◽  
Model Fits

ABSTRACT We present the results from an X-ray variability study of IRAS 13224-3809. This is probably the best source for X-ray reverberation studies since it is X-ray bright, extremely variable, and it has been extensively observed with XMM–Newton. We used all the archival XMM–Newton data from the three EPIC cameras (to increase the signal to noise) and, given the many observations of the source, we were able to compute the time lags spectra in three different flux levels/periods. We fitted the time lags and energy spectra, simultaneously, using a new X-ray reverberation code that computes the time-dependent reflection spectra of the disc as a response to an X-ray flash from a point source located on the axis of the black hole (BH) accretion disc (lamp-post geometry). To the best of our knowledge, this is the first time for active galactic nuclei that both time lags and energy spectra are fitted by a model simultaneously in different flux periods. The model fits in the case when the BH is rapidly rotating are significantly better than the model fits in the case of a Schwarzschild BH. This result strongly favours the hypothesis of a rotating central BH in this source. We also detect significant variations in the height of the X-ray corona. The X-ray height appears to increase from ∼3–5 gravitational radii when the X-ray luminosity is of the order of ∼1.5–3 per cent of the Eddington limit, up to ∼10 gravitational radii, when the luminosity doubles.

Reverse Engineering of Cam Design Based on BP NN

2014 ◽  
Vol 1039 ◽  
pp. 476-483
Author(s):  
Yan Zhao ◽  
Li Xin Lu ◽  
Gui Qin Li ◽  
Zheng Li ◽  
Xiao Yuan ◽  
...  
Keyword(s):  
Reverse Engineering ◽  
Curve Fitting ◽  
Demand Curve ◽  
Back Propagation ◽  
Learning Ability ◽  
Cam Design ◽  
Cubic Curve ◽  
Better Than ◽  
Model Fits

A three layer BP NN is created to design the cam. The data of cam contour ,which can be measured by CMM, has been used for the training where back propagation method is used.Advantage of solving nonliner problems gives BP netwok the ability to make out a more demand curve of cam. Taking advantage of its learning ability,NN model fits the actual cam contour gradually until the error fulfil the demand.Cam contour is ploted by Matlab,the result of which is better than cubic curve fitting,especially in the aspects of precise and velocity.

scholarly journals Modeling Dividend Behavior in Pakistan

2011 ◽  
Vol 3 (6) ◽  
pp. 289-301 ◽  
Author(s):  
Fazli Haleem
Keyword(s):  
Interest Rate ◽  
Dividend Policy ◽  
Manufacturing Sector ◽  
Share Price ◽  
Price Behavior ◽  
Relative Significance ◽  
Investment Demand ◽  
Net Profit ◽  
Better Than ◽  
Model Fits

This study examines the determinants of dividend policy by Lintner (1956) and Braittan (1966) and their extended versions to examine their relative significance in the Pakistani context. The sample consists of thirty-five firms in the overall manufacturing sector and three sub-sectors: textile, energy and chemicals the period 2007 to 2009. The analysis reveals that Lintner model is better than other models examined in the study and net profit and lag dividends are important determinants of dividend policy in Pakistani manufacturing sector. The depreciation and liquidity has significant impact on the dividend policy when included in the Lintner model while investment demand, interest rate, share price behavior and debt turn out to be insignificant. The results imply that for dividend decisions, past dividends, profits and depreciation matters and Lintner model fits the data well in case of manufacturing sector of Pakistan.

Time and Latitude in South Africa

1972 ◽  
Vol 1 ◽  
pp. 27-38
Author(s):  
J. Hers
Keyword(s):  
South Africa ◽  
Cape Town ◽  
Astronomical Observations ◽  
Royal Observatory ◽  
The Republic ◽  
Astronomical Determination ◽  
Limited Accuracy ◽  
Better Than

In South Africa the modern outlook towards time may be said to have started in 1948. Both the two major observatories, The Royal Observatory in Cape Town and the Union Observatory (now known as the Republic Observatory) in Johannesburg had, of course, been involved in the astronomical determination of time almost from their inception, and the Johannesburg Observatory has been responsible for the official time of South Africa since 1908. However the pendulum clocks then in use could not be relied on to provide an accuracy better than about 1/10 second, which was of the same order as that of the astronomical observations. It is doubtful if much use was made of even this limited accuracy outside the two observatories, and although there may – occasionally have been a demand for more accurate time, it was certainly not voiced.

Localization of immunolabels by electron microscopy and image averaging

1983 ◽  
Vol 41 ◽  
pp. 282-283
Author(s):  
J. Frank ◽  
P.-Y. Sizaret ◽  
A. Verschoor ◽  
J. Lamy
Keyword(s):  
Electron Microscopy ◽  
Single Particle ◽  
Attachment Site ◽  
Uranyl Acetate ◽  
Limulus Polyphemus ◽  
Resolution Limit ◽  
Electron Microscopic ◽  
Image Averaging ◽  
Top View ◽  
Better Than

The accuracy with which the attachment site of immunolabels bound to macromolecules may be localized in electron microscopic images can be considerably improved by using single particle averaging. The example studied in this work showed that the accuracy may be better than the resolution limit imposed by negative staining (∽2nm).The structure used for this demonstration was a halfmolecule of Limulus polyphemus (LP) hemocyanin, consisting of 24 subunits grouped into four hexamers. The top view of this structure was previously studied by image averaging and correspondence analysis. It was found to vary according to the flip or flop position of the molecule, and to the stain imbalance between diagonally opposed hexamers (“rocking effect”). These findings have recently been incorporated into a model of the full 8 × 6 molecule.LP hemocyanin contains eight different polypeptides, and antibodies specific for one, LP II, were used. Uranyl acetate was used as stain. A total of 58 molecule images (29 unlabelled, 29 labelled with antl-LPII Fab) showing the top view were digitized in the microdensitometer with a sampling distance of 50μ corresponding to 6.25nm.

Closing the GAP—A 5Å Scanning Microscope

1969 ◽  
Vol 27 ◽  
pp. 6-7
Author(s):  
A. V. Crewe
Keyword(s):  
Normal Form ◽  
The Other ◽  
Resolving Power ◽  
Scanning Microscope ◽  
Conventional Microscope ◽  
Other Hand ◽  
Closing The Gap ◽  
Thermal Sources ◽  
Better Than ◽  
Transmission Microscope

We have become accustomed to differentiating between the scanning microscope and the conventional transmission microscope according to the resolving power which the two instruments offer. The conventional microscope is capable of a point resolution of a few angstroms and line resolutions of periodic objects of about 1Å. On the other hand, the scanning microscope, in its normal form, is not ordinarily capable of a point resolution better than 100Å. Upon examining reasons for the 100Å limitation, it becomes clear that this is based more on tradition than reason, and in particular, it is a condition imposed upon the microscope by adherence to thermal sources of electrons.

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