sir_exp: Calculate SMR

In WetRobot/popEpi: Functions for Epidemiological Analysis using Population Data

Calculate SMR

Description

Calculate Standardized Mortality Ratios (SMRs) using a single data set that includes observed and expected cases and additionally person-years.

sir_lex solves SMR from a Lexis object calculated with lexpand.

sir_ag solves SMR from a aggre object calculated using lexpand.

Usage

sir_exp(
  x,
  obs,
  exp,
  pyrs = NULL,
  print = NULL,
  conf.type = "profile",
  test.type = "homogeneity",
  conf.level = 0.95,
  subset = NULL
)

sir_lex(x, print = NULL, breaks = NULL, ...)

sir_ag(
  x,
  obs = "from0to1",
  print = attr(x, "aggre.meta")$by,
  exp = "d.exp",
  pyrs = "pyrs",
  ...
)

Arguments

x	Data set e.g. aggre or Lexis object (see: lexpand)
obs	Variable name of the observed cases in the data set
exp	Variable name or expression for expected cases
pyrs	Variable name for person-years (optional)
print	Variables or expression to stratify the results
conf.type	select confidence interval type: (default=) 'profile', 'wald', 'univariate'
test.type	Test for equal SIRs. Test available are 'homogeneity' and 'trend'
conf.level	Level of type-I error in confidence intervals, default 0.05 is 95% CI
subset	a logical vector for subsetting data
breaks	a named list to split age group (age), period (per) or follow-up (fot).
...	pass arguments to sir_exp

Details

These functions are intended to calculate SMRs from a single data set that includes both observed and expected number of cases. For example utilizing the argument pop.haz of the lexpand.

sir_lex automatically exports the transition fromXtoY using the first state in lex.Str as 0 and all other as 1. No missing values is allowed in observed, pop.haz or person-years.

Value

A sir object

Functions

• sir_lex():

• sir_ag():

Author(s)

Matti Rantanen

See Also

lexpand A SIR calculation vignette

Other sir functions: lines.sirspline(), plot.sirspline(), sir_ratio(), sirspline(), sir()

Examples

BL <- list(fot = 0:5, per = c("2003-01-01","2008-01-01", "2013-01-01"))

## Aggregated data
x1 <- lexpand(sire, breaks = BL, status = status != 0, 
              birth = bi_date, entry = dg_date, exit = ex_date,
              pophaz=popmort,
              aggre=list(sex, period = per, surv.int = fot))
sir_ag(x1, print = 'period')


# no aggreate or breaks
x2 <- lexpand(sire, status = status != 0, 
              birth = bi_date, entry = dg_date, exit = ex_date,
              pophaz=popmort)
sir_lex(x2, breaks = BL, print = 'per')

WetRobot/popEpi documentation built on Aug. 29, 2023, 3:53 a.m.