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Table 2 Percentage of non-convergence for 150 and 500 clusters

From: Binomial outcomes in dataset with some clusters of size two: can the dependence of twins be accounted for? A simulation study comparing the reliability of statistical methods based on a dataset of preterm infants

Outome/

Method of

Random intercept

Perc. of non-

Random intercept

Perc. of non-

No of clusters

estimation

variance

convergence*

variance

convergence*

  

2 covariates

4 covariates

death

PQL

0.5 to 2

3 to 0%

0.5 to 2

53 to 0%

150

GH

0.5 to 2

0 to 1%

0.5 to 2

0 to 1%

 

GEE

0.5 to 2

3 to 1%

0.5 to 2

3 to 1%

death

PQL

0.5 to 2

≤ 1%

0.5 to 2

≤ 1%

500

GH

0.5 to 2

0%

0.5 to 2

0%

 

GEE

0.5 to 2

≤ 2%

0.5 to 2

≤ 1%

O 2 dep

PQL

0.5 to 2

0%

0.5 to 2

18 to 0%

150

GH

0.5

20 to 27%

0.5

0%

  

1

19 to 28%

1

0%

  

2

18 to 28%

2

0%

 

GEE

0.5 to 2

5 to 0%

0.5 to 2

6 to 0%

O 2 dep

PQL

0.5 to 2

0%

0.5 to 2

0%

500

GH

0.5

37 to 48

0.5

≤ 1%

  

1

35 to 46%

1

≤ 1%

  

2

34 to 46%

2

≤ 1%

 

GEE

0.5 to 2

0%

0.5 to 2

≤ 1%

  1. *for percentage of twins ranging from 2 to 20%