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1.12

• corrected the frailty variance for the MIG and MBS models

1.11

• corrected the observed log-likelihood function for the MIG model
• option MBS (mixture of Birnbaum-Saunders) was added in frailty.fit function

1.10

• corrected the variance of frailty for the MIG model and its estimated standard error

1.9

• option MIG (mixture of inverse gaussian) was added in frailty.fit function

1.8

• removed dependency of frailtypack package

1.7

• option TN (truncated normal) was added in frailty.fit function

1.6

• fixed bugs in summary.extrafrail function to compute p-values

1.5

• option exp (exponential) was added in frailty.fit function as baseline model
• fixed bugs in summary.extrafrail function for pe distribution as baseline model

1.4

• option pe (piecewise exponential) was added in frailty.fit function as baseline model

1.3

• option BS (Birnbaum-Saunders) was added in frailty.fit function

1.2

• fixed bugs in summary.extrafrail function

1.1

• function frailtyWL was deprecated
• function frailty.fit was included. Besides the shared weighted Lindley frailty model, this function allows to perform estimation for the shared gamma and shared inverse gaussian frailty models.

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They may not be fully stable and should be used with caution. We make no claims about them.
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