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Algorithmic Criminology - Statistics Department
child for these approaches ... 2Usual criminology practice begins with a statistical model of some criminal justice process assumed to be have generated the data.
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Featurizing Text: Converting Text into Predictors for ...
www-stat.wharton.upenn.eduquantitative features extracted from text can elucidate the structure of a model. Key Phrases: sentiment analysis, n-gram, latent semantic analysis, text mining Research supported by NSF grant 1106743 1
Logs In Regression - Statistics Department
www-stat.wharton.upenn.eduStatistics 621 Robert Stine Fall, 2001 1
BART: Bayesian Additive Regression Trees
www-stat.wharton.upenn.eduditive Regression Trees) which uses a sum of trees to model or approximate f(x) = E(Y j x). The essential idea is to elaborate the sum-of-trees model (2) by imposing a prior that regularizes the flt by keeping the individual tree efiects small. In efiect, the gj’s become a dimensionally adaptive random basis of \weak
State-Space Models - Statistics Department
www-stat.wharton.upenn.eduState-space models are natural in. Statistics 910, #14 3 this class of indirectly observed processes, such as an array in which we observe only the marginal totals. State-space models The data is a linear function of an underlying Markov process (the \state") plus additive noise. The state is observed directly
The Yule Walker Equations for the AR Coefficients
www-stat.wharton.upenn.edu• multiply both sides of the model by x i, x ix i+1 = Xp j=1 (φ jx ix i−j+1)+x iξ i+1, where i and j are the time and term indices, respectively, • take expectance, hx ix i+1i = Xp j=1 (φ jhx ix i−j+1i)+hx iξ i+1i where the {φ j}s are kept outside the expectance operator because they are deterministic, rather than statistical ...
Forecasting ARMA Models
www-stat.wharton.upenn.eduForecasts revert quickly to series mean Unless model is non-stationary or has very strong autocorrelations Prediction intervals open as extrapolate Variance of prediction errors rapidly approaches series variance 8-10.00-5.00 0.00 5.00 10.00 Y 196 198 200 202 204 206 208 210 Rows observed forecast
Practice Questions: Multiple ... - Statistics Department
www-stat.wharton.upenn.educertain features of the vehicle, particularly those relating to its performance. Among the predictors, the displacement measures the size of the engine in cubic inches, and ... Statistics 621 Multiple Regression Practice Questions
Explaining Normal Quantile ... - Statistics Department
www-stat.wharton.upenn.edudistribution that de nes the y-axis; choices include a normal distribution, the shown gamma distribution (with shape parameter 3), a beta distribution, t-distributions (with 3 and 6 degrees of freedom), and a mixture of a normal and gamma. 3 Empirical QQ plots Applying this analogy to the normal QQ plot of data requires more work and imagina-
Analysis of Variance for Regression/Multiple Regression
www-stat.wharton.upenn.eduMultiple Linear Regression Model One possible model for the population regression function is the multiple linear regression model, an analogue of the simple linear regression model: " " Interpretation of: The change in the mean of if is increased by one unit and all other explanatory variables, " are held fixed.
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