Truncated Data

Definition

Truncated Data: Data with left-truncation (subjects entered study after time 0).

Truncation is a selection mechanism by design. Only subjects who satisfy certain conditions regarding their survival time $T$ are included in the sample.

Types of Truncation

1. Left Truncation (Delayed Entry): Only subjects who have not yet experienced the event at time $T\_L$ are included.

   • Condition: $T>T\_L$

2. Right Truncation: Only subjects who have already experienced the event before time $T\_R$ are included.

   • Condition: $T<T\_R$

Related

• Censored Data