seizure


The data consists of 59 subjects from the randomized progabide trial.


Generalized estimating equations with the original sandwich variance estimator proposed by Liang and Zeger (1986), and eight types of more recent modified variance estimators for improving the finite small-sample performance.

Zheng Li

geesmv

Modified Variance Estimators for Generalized Estimating
Equations

seizure function

<ul>
<li>base:baseline epiliptic seizure counts
  </li>
<li>trt:the indicator for treatment (1=progabide; 0=control)
  </li>
<li>age:baseline age for each subject
  </li>
<li>y1:epiliptic seizure counts in the first week
  </li>
<li>y2:epiliptic seizure counts in the second week
  </li>
<li>y3:epiliptic seizure counts in the third week
  </li>
<li>y4:epiliptic seizure counts in the forth week
  </li>
</ul> 

Format

Thall PF, and Vail SC. Some covariance models for longitudinal count data with overdispersion. Biometrics 1990; 46: 657-671.

seizure: Epiliptic seizure counts from the Randomized Progabide Trial

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