Snapshot of the Pack: Parametric Bootstrap or Resample a projection matrix pack

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Title Parametric Bootstrap or Resample a projection matrix pack
Items 3
Created by Maria Paula Balcazar-Vargas
Created at 14:03:43 on Wednesday, 09 July 2014
Last updated at 09:41:32 on Friday, 25 July 2014

Description

This pack contains a workflow, a file and documentation (tutorial to run the workflow). The Parametric Bootstrap or Resample a projection matrix Workflow provides an environment to resample a projection matrix using a multinomial distribution for transitions and a log normal distribution for fertilities (Stubben, Milligan, and Nantel. 2011). The resample is based on number of plants surveyed. The projection matrix A is first split into separate transition and fertility matrices. Dead fates are added to the transition matrix and the columns are then sampled from a Multinomial distribution based on the size in each corresponding stage class in n. The fertility rates are sample from a Log Normal distribution using the lnorms function. The same variance is applied to all rates by default. (Stubben, Milligan and Nantel 2013, Caswell 2001 see section 12.1.5.2).

The goal of a demographic analysis is very often to estimate lambda, because lambda is estimated from imperfect data, such estimation are uncertain. Therefore, when the results have policy implications it is important to quantify that uncertainty. Confidence interval is one of the traditional tools to doing so (see outputs: Confidence interval of Lambda).

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