PS 233

2. The Problem of Heteroskedasticity. Heteroskedasticity is one of two possible violations of our assumption E(ee')=s2InSpecifically, it is a violation of the assumption of constant error varianceIf errors are heteroskedastic, then coefficients are unbiased, but standard errors and t-tests are wr

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1.3mmPU10cm 2.PS 3.PS

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PS HISTORY

PS HISTORY

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PS 233

2. Evaluating Our Models. Our hypothesis tests tend to focus on individual coefficients t-testsIn addition, we may want to make an overall evaluation of our modelIs the model a good fit?" to the dataDoes the model explain" the dependent variable?. 3. Explaining" Variance. What do we mean whe

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PS 233

The Problem of Heteroskedasticity. Autocorrelation is one of two possible violations of our assumption E(ee')=s2InSpecifically, it is a violation of the assumption E(et,et-1)=0Coefficients are unbiased, but standard errors and t-tests are wrong.Generally, standard errors are TOO SMALL. Patterns

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PS 233

2. Standards of Model Evaluation. Statistical Significance of CoefficientsT-testsSubstantive Size of EffectsGenerate predictions from the modelSize of ResidualsCompare to substantive effectsForecasting Out-of-Sample. 3. Statistical Significance of Coefficients. First thing we want to do with a

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PS 1.2a

PS 1.2a. Hybrid Active-Passive Rotor Systems for Vibration and Performance. Principal Investigators. Kon-Well Wang Diefenderfer Chaired Professor Mechanical Engineering Tel : (814) 865-2183. Edward Smith Professor Aerospace Engineering Tel : (814) 863-0966 . Graduate Student

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PS 233

2. OLS Assumptions about Error Variance and Covariance. Talked last time about omitted variable biasViolates the assumption E(e)=0This was only one of the assumptions we made about errors to show that OLS is BLUEAlso assumed cov(e)=E(ee')=s2InThat is, we assumed e ~ (0, s2In). 3. What Should ee

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PS-21

PS-21. Physical Science in the 21st Century First Fall Institute Septber 19, 2010 University of Alabama, Tuscaloosa AL J. W. Harrell, Stan Jones, Dennis Sunal, Cynthia Sunal, April Nelms WIKI Website: http:// ps21-pd.wikispaces.com

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PS 148

PS 148. To Monsieur Pierre Antoine Dumas and to Monsieur Barthèlemy Artru, Curès at Boulieu and at Peaugres,(Ardèche), repectively, 1837-10-30, Ps 148, . Introduction.

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PS

7a. FI. PS . 1. N2 Gas. 2. TE. TT. 8a. 8b. 3. VE. DAQ. Computer. 4. 7b. Labview. 6b. 6a. Chiller. TT-Temperature Transistor TE-Temperature Element VE-Voltage Element TI1- Temperature Indicator Inlet TI2- Temperature Indicator Outlet FI-Flow Indicator. Water Trap. TI1.

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PS-21

PS-21. Physical Science in the 21st Century Second Fall Institute November 16, 2012 University of Alabama, Tuscaloosa AL J. W. Harrell, John Vincent, Stan Jones, Dennis Sunal, Cynthia Sunal, Donna Turner PS-21 Website: http://ps21pd.weebly.com/

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Woodlands PS

Woodlands PS. How to use an Instructional Intelligence Framework to develop continuity and consistency across all year levels. Opening Thoughts. “The chains of habit are too weak to be felt until they are too strong to be broken.” Dr Samuel Johnson

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PS 372

PS 372. Introduction. Practical Application. 1.) As citizens in the US you are often called upon to evaluate empirical research and theoretical arguments about political phenomena. (Debates on Abortion / Death Penalty; Election Polls in US; Events in other parts of the world)

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PS 148

PS 148. To Monsieur Pierre Antoine Dumas and to Monsieur Barthèlemy Artru, Curès at Boulieu and at Peaugres,(Ardèche), repectively, 1837-10-30, Ps 148,. Introduction.

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PS II

E acceptor. 2 H +. E acceptor. ADP. ATP. e. e. e. 2 e-. H 2 O. light. light. O 2. NADP. NADPH 2. ETS. PS I. PS II. A:. B:. D:. C:. NADPH 2. ATP. NADP. ADP. From light reaction : NADPH 2 and ATP. In stroma. CO 2. 6 C ( unstable ). 5 C RuBP. 3 C PGA. 3 C PGAL

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PS Upgrade

PS Upgrade. 22 June 2010 CALO Upgrade Meeting. Pascal Perret LPC Clermont. PreShower Function. Part of CALO system: SPD, PS, ECAL, HCAL Same granularity than SPD and ECAL 6016 cells used for: Trigger L0: hadron / electron differentiation

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PS 1TFB

PS 1TFB. Introduction. 3 cavity voltage feedbacks in parallel. The PS one turn Feedback is nothing more than a cavity voltage feedback It has the same role as the fast feedback on narrow frequency bands

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