sir_ratio | R Documentation |
Calculate ratio of two SIRs by providing observed and expected counts to sir_ratio
The related functions sir_ratio_lci
and sir_ratio_uci
can also calculate lower and upper estimates of the confidence interval
Calculations are based on formulas suggested by Breslow & Day 1987
sir_ratio(o1, o2, e1, e2) sir_ratio_lci(o1, o2, e1, e2, alpha = 0.05) sir_ratio_uci(o1, o2, e1, e2, alpha = 0.05)
o1 |
observed count for SIR 1 |
o2 |
observed count for SIR 2 |
e1 |
expected count for SIR 1 |
e2 |
observed count for SIR 2 |
alpha |
alpha significance level for confidence interval calculations. Default is alpha = 0.05 which will give 95 percent confidence intervals. |
num numeric value of SIR / SMR estimate
Breslow NE, Day NE. Statistical Methods in Cancer Research Volume II: The Design and Analysis of Cohort Studies. Lyon, France: IARC; 1987. (IARC Scientific Publications IARC Scientific Publications No. 82). Available from: http://publications.iarc.fr/Book-And-Report-Series/Iarc-Scientific-Publications/Statistical-Methods-In-Cancer-Research-Volume-II-The-Design-And-Analysis-Of-Cohort-Studies-1986
#provide the two expected and observed count to get the ratio of SIRs/SMRs msSPChelpR::sir_ratio(o1 = 2140, o2 = 3158, e1 = 1993, e2 = 2123) #calculate lower confidence limit msSPChelpR::sir_ratio_lci(o1 = 2140, o2 = 3158, e1 = 1993, e2 = 2123, alpha = 0.05) #calculate upper confidence limit msSPChelpR::sir_ratio_uci(o1 = 2140, o2 = 3158, e1 = 1993, e2 = 2123, alpha = 0.05) #functions can be easily used inside dplyr::mutate function library(dplyr) test_df <- data.frame(sir_oth = c(1.07, 1.36, 0.96), sir_smo = c(1.49, 1.81, 1.41), observed_oth = c(2140, 748, 1392), expected_oth = c(1993, 550, 1443), observed_smo = c(3158, 744, 2414), expected_smo = c(2123, 412, 1711)) test_df %>% mutate(smo_ratio = sir_ratio(observed_oth, observed_smo, expected_oth, expected_smo), smo_ratio_lci = sir_ratio_lci(observed_oth, observed_smo, expected_oth, expected_smo), smo_ratio_uci = sir_ratio_uci(observed_oth, observed_smo, expected_oth, expected_smo))
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