# Posts Tagged ‘ ods system ’

## Example 9.14: confidence intervals for logistic regression models

November 15, 2011
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Recently a student asked about the difference between confint() and confint.default() functions, both available in the MASS library to calculate confidence intervals from logistic regression models. The following example demonstrates that they yield d...
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## Example 9.14: confidence intervals for logistic regression models

November 15, 2011
By

Recently a student asked about the difference between confint() and confint.default() functions, both available in the MASS library to calculate confidence intervals from logistic regression models. The following example demonstrates that they yield d...
Read more »

Tags: , , , , , , , ,
Posted in SAS | Comments Off

## Example 9.14: confidence intervals for logistic regression models

November 15, 2011
By

Recently a student asked about the difference between confint() and confint.default() functions, both available in the MASS library to calculate confidence intervals from logistic regression models. The following example demonstrates that they yield d...
Read more »

Tags: , , , , , , , ,
Posted in SAS | Comments Off

## Example 8.42: skewness and kurtosis and more moments (oh my!)

June 27, 2011
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While skewness and kurtosis are not as often calculated and reported as mean and standard deviation, they can be useful at times. Skewness is the 3rd moment around the mean, and characterizes whether the distribution is symmetric (skewness=0). Kurtos...
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## Example 8.42: skewness and kurtosis and more moments (oh my!)

June 27, 2011
By

While skewness and kurtosis are not as often calculated and reported as mean and standard deviation, they can be useful at times. Skewness is the 3rd moment around the mean, and characterizes whether the distribution is symmetric (skewness=0). Kurtos...
Read more »

Tags: , , , , , ,
Posted in SAS | Comments Off

## Example 8.42: skewness and kurtosis and more moments (oh my!)

June 27, 2011
By

While skewness and kurtosis are not as often calculated and reported as mean and standard deviation, they can be useful at times. Skewness is the 3rd moment around the mean, and characterizes whether the distribution is symmetric (skewness=0). Kurtos...
Read more »

Tags: , , , , , ,
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## Example 8.34: lack of robustness of t test with small n

April 12, 2011
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Tim Hesterberg has effectively argued for a larger role for resampling based inference in introductory statistics courses (and statistical practice more generally). While the Central Limit Theorem is a glorious result, and the Student t-test remarkabl...
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## Example 8.18: A Monte Carlo experiment

December 13, 2010
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In recent weeks, we've explored methods to fit logistic regression models when a state of quasi-complete separation exists. We considered Firth's penalized likelihood approach, exact logistic regression, and Bayesian models using Markov chain Monte Ca...
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