Questions tagged [incidence-rate-ratio]
The incidence-rate-ratio tag has no usage guidance.
76
questions
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Conway-Maxwell-Poisson (CMP) - Coefficient interpretation (Log/IRR)
I'm using the Conway-Maxwell-Poisson (CMP) distribution to model the amount of nouns in a clause (data is under-dispersed). I've run the model using glmmTMB (family= "compois") but I'm ...
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6 views
How to determine “per” population size for incidence rate
I am reading notes for a given assignment and incidence rate is defined as
$$
\frac{new cases}{observed population} x 10^n
$$
The only thing that is confusing me is that what to use for ...
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0answers
28 views
How to estimate prevalence with a zero incidence (rare disease)? [duplicate]
I had to solve the following problem.
Newborn screening has been implemented for a very rare pathology.
For 6 months, and out of 50,000 births observed, no sick case was observed.
What is the ...
2
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1answer
18 views
Incidence rate ratio after negative binomial results in R
I am trying to calculate the incidence rate ratio of my negative binomial model. After running my negative binomial regression model, I use exp(Mymodel) in order to ...
2
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1answer
144 views
Calculation of the Confidence Interval for Incidence Rate Ratio using Exact Approach
I have incidence rate ratio equal to 0.04:
If I am not mistaken, normal computation of CI is:
...
0
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0answers
7 views
Calculate incidence rate ratios for age groups and detect change over time?
I have age-specific incidence rates grouped in 5-year age bands over a 5 year period. I would like to test if the rates are increasing over time and know which 5-year age band group is increasing or ...
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0answers
29 views
What statistical test is appropiate to compare the cumulative incidence of different causes
For a study that evaluates survival in different agegroups (<80 vs >80), I would like to compare the cumulative incidence of the mortality/status of the patient (0= alive, 1= dead of other cause,...
0
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1answer
65 views
Are there any difference between irr (Incidence Rate Ratio) and exp (beta) coefficient?
I am wondering that are there any difference between IRR (Incidence Rate Ratio) and the exp(beta) coefficient?
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56 views
How to convert Incidence rate ratio into probability?
I understand that converting odds ratio into probability one can divide the odds by the odds plus one. Is it the same formula to convert Incidence rate ratio into probability?
I'm trying to interpret ...
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0answers
27 views
Crude incidence rate ratios giving different results to conditional Poisson regression model
I am analysing the treatment effect of a compound, namely the rate at which an event occurs during treatment. I have calculated the crude incidence rate ratio for a group of subjects, each of whom has ...
2
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0answers
32 views
Standard incidence rate
I am conducting a meta-analysis where I pool standard incidence ratio's. Several of the studies do not give the SIR between the groups I would like to compare but do give the SIR relative to another ...
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11 views
Use of probabilistic sensitivity analysis in determining incidence over time
I'm plotting incidence (y, per 10,000 population) over time (x, years) using results from a simulation model. And seeing when the incidence reaches below a certain incidence target (1/10,000). It was ...
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1answer
53 views
Determining the statistical significance of change in incidence rates
What is the approach to use to determine the statistical significance of change in incidence rate over years?
Below is at table showing such kind of data of incidence rate per 1000.
...
1
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1answer
19 views
Is there a way to compare incidences of 2 diseases in the same cohort?
I would like to compare incidences of 2 diseases in the same cohort for the past 10 years.
Eg. I want to see whether there's an association between incidence of heart disease and incidence of ...
2
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1answer
298 views
3
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1answer
94 views
Meta-analysis with random effects on prevalence data with > 2 possible outcomes: is it necessary that the weighted prevalences all add up to 100?
I am running a meta analysis on prevalence data. Participants can belong to one of four groups. Each study produces the percentage of participants that belong to each group (e.g., Group A: 50%; Group ...
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26 views
Which statistical analysis model to use to calculate the relationship between diabetes incidence and endothelial function?
I have longitudinal data with 2 follow ups at year 1 and 3. At baseline we have measure of endothelial function and we want to calculate the relation ship between endothelial function and diabetes ...
0
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1answer
120 views
What is the difference between 1-year partial prevalence and annual incidence?
In cancer research, like in this article, partial prevalence is sometimes used to assess the epidemiological state of a disease in a population.
The document I'm trying to understand (link, in french) ...
1
vote
1answer
153 views
How to model counts of a categorical variable?
I'm interested in assessing the impact of various covariates (age, sex, Charlson comorbidity score, etc.) on the incidence rate of a pulmonary event. However, the event is not binary. Each patient ...
0
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1answer
49 views
comparing incidence rate
I have a data set of individual level data for the outcome in question. I also have aggregated data (at a national level) from which I'm obtaining the denominator. Using this information, I've ...
1
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0answers
11 views
Test for yield and disease incidence in block design
I need to analyse a set of data coming from an agricultural experiment, with the intention of assessing the incidence of a certain disease in potatoes under three different treatments (plus blank). I'...
2
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1answer
71 views
Calculate incidence rate per person or in total
For my study I am doubting about the following:
First I want to present the incidence rate for patients who received an CT-scan.
I thought I would just count all the CT-scans that took place and ...
1
vote
1answer
3k views
what is x per 100 person years mean?
In medical papers, it is very common to calculate incidence rate and mention it's unit as per 100 person years. What does this means?
I know that incidence rate is the amount of people got the event ...
1
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0answers
36 views
Confidence intervals for Ratios of Correlated (nested) Age-Adjusted Rates
I am interested in calculating the incidence of disease in an ethnic subpopulation (denoted $X$) and comparing this with the incidence in the entire population ($\Omega$) (where $X$ is a true subset ...
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0answers
22 views
Modeling hip fracture incidence (hospital-based cohort design)
Hoping someone can help me out with a question I have on an analysis looking at prosthetic hip fracture incidence following hip replacement surgery (exposure=type of implant, with reference being the ...
0
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2answers
354 views
Validity of non independent observations in Poisson regression when modelling incidence rates
I have a question regarding fitting a poisson model to non-independent observations when assessing the incidence of an outcome.
I am interested in the incidence of some outcome, O, over time. I have ...
8
votes
3answers
270 views
Calculate probability of disease appearance
I am a doctor so please be kind with me and my basic understanding of statistics.
I have a dataset consisting of patients and their visits and I have labelled the presence of a specific kind of mole ...
2
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1answer
68 views
Visualize the rate of reported cases of disease with respect to the population
I have to do some visualizations about vaccines. I downloaded data on reported cases of vaccine-preventable diseases (for example, measles, tetanus, etc.) here. These data are absolute values. I ...
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459 views
Interpreting Poisson regression model [duplicate]
I am having a mighty difficult time interpreting the following results given to me based on a generalized linear model with a Poisson distribution:
Data: data represents the number of visitors to a ...
1
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0answers
36 views
Standardized Infection Rate from predicted probabilities. Which method?
I need to calculate the Standardized Infection Rate (SIR), that is the ratio between actual cases of infection and predicted cases based on a predictive model.
According to CDC https://www.cdc.gov/...
0
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1answer
389 views
Compare incidence rate
During the follow-up time, event A will happen multiple times, and there are 3 types of A, I call it A1, A2 and A3. I wonder if there is a statistical method that I can calculate the incidence rates ...
2
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0answers
432 views
Interpreting incidence rate ratios in poisson without exposure variable [duplicate]
I have a dataset made up of observations of procedural cases, with a count outcome (variable X carries the number of times a specific finding was detected in one procedure/case). My denominator is the ...
0
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0answers
298 views
Calculation of person years in a cohort study for survival analyses
I am analysing data from a cohort study using primary care data (but I linked them up to secondary care data only for the outcome). Specifically, I am looking at the adoption of a specific care ...
0
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1answer
486 views
How to calculate relative risk if the reference group has an incidence of 0?
this appears to be a quite difficult question. As we know, if 20% of the smokers developed lung cancer and 10% of the non-smokers developed lung cancer, then we say that cigarette smoking is ...
0
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1answer
600 views
Adjusting variable for covariate to calculate rates or metric
In this report by Dartmouth Institute, rates of utilisation (per patient) were reported by year and regions. The input measure of utilisation were said to have been adjusted for differences in age, ...
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2answers
1k views
Incident rate ratios with log-transformed variables in Poisson regression
I'm in a bit of a mess with interpreting the output of a Poisson regression model with log-transformed predictors. The predictors are counts, and the log transforms them for the linear part of model.
...
1
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1answer
71 views
Can odds ratio be in different direction to rate ratio?
My question is whether it is plausible to have "Rate Ratio" showing an increased risk while "Odds Ratio" (based on the same data) showing decreased risk?
I have an example in this article:
http://...
1
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0answers
52 views
How to Assess Significance of the Difference in Incidence Rate Ratios?
Imagine we estimate two sequential negative binomial regressions. In the first one, we use say 3 predictors (x1, x2,x3), and in the second, we use the same 3 plus an additional variable (x4). We are ...
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2answers
96 views
What type of statistical test should be used to compare successes of two treatments?
Say I have two treatments, "hot" and "cold".
I care about a certain outcome, say "success".
I have data on the number of successes out of, say 100 trials in the "hot" treatment.
Similarly, I have data ...
1
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0answers
138 views
Interpreting categorical x categorical interaction in a poisson regression [duplicate]
I have run a poisson regression with two categorical predictors (treatment and disease severity) and their interaction, controlling for a number of relevant covariates. Treatment has two levels (...
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0answers
361 views
Are these negative binomial regression results reasonable?
I did a negative binomial regression on a data set with 4 covariables. The count outcome has values up to 600.
I did a mixture model with 2 components, also called a latent class model.
However, I am ...
3
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2answers
6k views
How to calculate 95% CI for cumulative incidence rate using R?
for example, 30 events during 10000 person-years, the cumulative incidence rate is 3 per 1000 person-years, how to calculate its 95% CI?
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0answers
223 views
Modeling incidence rates in family-based cohort: Poisson vs Cox
I have a cohort made of family trios and affected sib pairs (probands have rheumatoid arthritis - RA). I would like to calculate some incidence densities (for example apparitions of RA, of disease 1, ...
1
vote
1answer
62 views
Relationship between survival time and incidence rate
I am working on an operations issue. We process patients in care and pay close attention to their discharge rate, which is more or less calculated as an incidence rate (discharges per 100 patients). ...
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0answers
1k views
Can you calculate a standard error from confidence intervals?
Specifically, can I calculate a standard error from an incidence rate with known confidence intervals but no population size data?
1
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1answer
3k views
How can I calculate a confidence interval for a rate ratio, if I only have the rates?
I want to calculate the 95% CI for an incidence rate ratio (IRR), but I only have incidence rates per 10,000. (I do not have counts for the 2x2 table.)
Specifically, the incident rates were ...
0
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1answer
795 views
Can I compute the p-value for a list of incidence rates?
Coming back to statistics after a long time, so please forgive any ignorance.
I'm curious how I might be able to argue for statistical significance of a test. Specifically, I'm after a ...
1
vote
1answer
909 views
How to compare two incidence ratios statistically- the rate parameter test
I want to compare two standardized incidence ratios (SIR) obtained in stratified analyses. I read in Mocci et al (2013) that they used the rate parameter test and cited the book Statistical models in ...
1
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1answer
1k views
Calculating OR and IRR for a zero-inflated negative binomial model from estimates
I used the PSCL package to run a zero-inflated negative binomial model on some count data I have.
This package gives the following output:
for the zero part of the model:
...
2
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1answer
154 views
Using Chi-Squared for Google Analytics test?
I am running a test in Google Analytics to find the impact of a new functionality release for sharing stuff.
The setup follows:
There is a control group which continues to see and use the old "...
