SocEpi (version 1.0.0)

smr: Standardized mortality ratios and confidence intervals

Description

The function smr calculates standardized mortality ratios (SMR) and confidence intervals for SMR.

Usage

smr(data, health, population, age, compare, sets, age_group = NULL, CI = 95)

Arguments

data

Name of data set.

health

Health outcome of interest.

population

Population counts. Should correspond to data provided in health.

age

Variable that defines 5-year age groups, should be ordered and numeric, such as 1 through 18. If the age group coding starts with 0 it will be assumed that age groups 0 and 1-4 are separate. If the age group starts with 1, it will be assumed that the first age group is 0-4 (ages 0 and 1-4 are combined).

compare

Categorical variable that splits the data into groups that are to be compared, such as ethnicity.

sets

Groups that are to be compared (values taken by compare). The group listed first will be the reference category. Must take at least two values.

age_group

The age groups the standardized rates should be calculated for. By default the function calculates results for the following age groups: 0-14, 15-29, 30-44, 45-59, 60-74, 75+, 0-64 and all ages. User supplied age groups should be provided using the standard population groups as cut-offs, e.g. use age_group=c("20-29", "30-39") and not c("19-30", "31-41"). Open ended age groups can be supplied by giving a single age, e.g. "45" means 45 and above. Overlapping age groups, such as c("20-29", "25-34"), are not supported. Results for ages 0-64 and all ages will always be provided.

CI

Confidence intervals, 95 by default but can be set to any number between 0 and 100. For calculation method see user guide.

Value

A data frame of standardized mortality ratios (SMR) and CIs.

Examples

# NOT RUN {
d <- health_data

# Asian population compared to Scottish (reference)
smr(d, bad, pop, age, ethnicity, sets = c("Scot", "asian"))

# Asian, White British and Irish population compared to Scottish (reference)
smr(d, bad, pop, age, ethnicity, sets = c("Scot", "asian", "WB", "Irish"),
  age_group = c("15-29", "30-44"), CI = 99)

# }