thar: thar

In demogR: Analysis of Age-Structured Demographic Models

Description

Caughley's (1966) survival data on Himalayan thar (Hemitargus jemlahicus).

Usage

data(thar)

Format

A data frame with 13 observations on the following 3 variables.

age

age class

count

the number of individuals at the start of the age class

deaths

observed deaths in the age class

Details

Caughley (1966) smoothed the counts within age classes and this data set used those reported smoothed counts.

Source

Caughley, G. 1966. Mortality patterns in mammals. Ecology 47:906-918.

Examples

data(thar)
thar.lt <- with(thar, 
    life.table(x=age, 
        nDx=deaths, 
        nKx=count, 
        type="cohort", 
        iwidth=1, 
        width12=c(1,1)))
thar.lt

Example output

    x nax    nMx    nqx     lx    ndx    nLx   Tx   ex
1   0 0.5 0.5317 0.5317 1.0000 0.5317 0.7341 3.49 3.49
2   1 0.5 0.0208 0.0208 0.4683 0.0098 0.4634 2.75 5.88
3   2 0.5 0.0532 0.0532 0.4585 0.0244 0.4463 2.29 4.99
4   3 0.5 0.1124 0.1124 0.4341 0.0488 0.4098 1.84 4.24
5   4 0.5 0.1392 0.1392 0.3854 0.0537 0.3585 1.43 3.72
6   5 0.5 0.1912 0.1912 0.3317 0.0634 0.3000 1.07 3.24
7   6 0.5 0.2182 0.2182 0.2683 0.0585 0.2390 0.77 2.88
8   7 0.5 0.2558 0.2558 0.2098 0.0537 0.1829 0.53 2.55
9   8 0.5 0.3125 0.3125 0.1561 0.0488 0.1317 0.35 2.25
10  9 0.5 0.3182 0.3182 0.1073 0.0341 0.0902 0.22 2.05
11 10 0.5 0.3333 0.3333 0.0732 0.0244 0.0610 0.13 1.77
12 11 0.5 0.4000 0.4000 0.0488 0.0195 0.0390 0.07 1.40
13 12 1.0 1.0000 1.0000 0.0293 0.0293 0.0293 0.03 1.00

demogR documentation built on May 1, 2019, 10:56 p.m.