cfr

R package to estimate disease severity and under-reporting in real-time, accounting for reporting delays in epidemic time-series

https://github.com/epiverse-trace/cfr

Science Score: 44.0%

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Low similarity (19.9%) to scientific vocabulary

Keywords

case-fatality-rate epidemic-modelling epidemiology epiverse health-outcomes outbreak-analysis r r-package sdg-3

Last synced: 6 months ago · JSON representation ·

Repository

R package to estimate disease severity and under-reporting in real-time, accounting for reporting delays in epidemic time-series

Basic Info

Host: GitHub
Owner: epiverse-trace
License: other
Language: R
Default Branch: main
Homepage: https://epiverse-trace.github.io/cfr/
Size: 21.1 MB

Statistics

Stars: 16
Watchers: 7
Forks: 5
Open Issues: 19
Releases: 4

Topics

case-fatality-rate epidemic-modelling epidemiology epiverse health-outcomes outbreak-analysis r r-package sdg-3

Created almost 4 years ago · Last pushed 6 months ago

Metadata Files

Readme Changelog Contributing License Citation

README.Rmd

---
output: github_document
bibliography: vignettes/resources/library.json
link-citations: true
---



```{r, include = FALSE}
knitr::opts_chunk$set(
  collapse = TRUE,
  comment = "#>",
  message = FALSE,
  warning = FALSE,
  fig.path = "man/figures/README-",
  out.width = "100%"
)
```

# {{ packagename }}: Estimate disease severity and under-reporting 



[![License: MIT](https://img.shields.io/badge/License-MIT-blue.svg)](https://opensource.org/license/mit)
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[![CRAN status](https://www.r-pkg.org/badges/version/{{ packagename }})](https://CRAN.R-project.org/package={{ packagename }})


_{{ packagename }}_ is an R package to estimate disease severity and under-reporting in real-time, accounting for delays in epidemic time-series.

_{{ packagename }}_ provides simple, fast methods to calculate the overall or static case fatality risk (CFR) of an outbreak up to a given time point, as well as how the CFR changes over the course of the outbreak.
_{{ packagename }}_ can help estimate disease under-reporting in real-time, accounting for delays reporting the outcomes of cases.

_{{ packagename }}_ implements methods outlined in @nishiura2009. There are plans to add estimates based on other methods.

_{{ packagename }}_ is developed at the [Centre for the Mathematical Modelling of Infectious Diseases](https://www.lshtm.ac.uk/research/centres/centre-mathematical-modelling-infectious-diseases) at the London School of Hygiene and Tropical Medicine as part of the [Epiverse-TRACE initiative](https://data.org/initiatives/epiverse/).

## Installation

_{{ packagename }}_ can be installed from CRAN using

```r
install.packages("{{ packagename }}")
```

The current development version of _{{ packagename }}_ can be installed from [GitHub](https://github.com/) using the `pak` package.

```r
if(!require("pak")) install.packages("pak")
pak::pak("{{ gh_repo }}")
```

## Quick start

### Overall severity of the 1976 Ebola outbreak

This example shows how to use _{{ packagename }}_ to estimate the overall case fatality risks from the 1976 Ebola outbreak [@camacho2014], while correcting for delays using a Gamma-distributed onset to death duration taken from @barry2018, with a shape $k$ of 2.40 and a scale $\theta$ of 3.33.

```{r example-ebola-calc}
# Load package
library(cfr)

# Load the Ebola 1976 data provided with the package
data(ebola1976)

# Focus on the first 20 days the outbreak
ebola1976_first_30 <- ebola1976[1:30, ]

# Calculate the static CFR without correcting for delays
cfr_static(data = ebola1976_first_30)

# Calculate the static CFR while correcting for delays
cfr_static(
  data = ebola1976_first_30,
  delay_density = function(x) dgamma(x, shape = 2.40, scale = 3.33)
)
```

### Change in real-time estimates of overall severity during the 1976 Ebola outbreak

In this example we show how the estimate of overall severity can change as more data on cases and deaths over time becomes available, using the function `cfr_rolling()`. 
Because there is a delay from onset-to-death, a simple "naive" calculation that just divides deaths-to-date by cases-to-date will underestimate severity.
The `cfr_rolling()` function uses the `estimate_severity()` adjustment internally to account for delays, and instead compares deaths-to-date with cases-with-known-outcome-to-date.
The adjusted estimate converges to the naive estimate as the outbreak declines and a larger proportion of cases have known outcomes.

```{r example-ebola-plot}
# Calculate the CFR without correcting for delays on each day of the outbreak
rolling_cfr_naive <- cfr_rolling(
  data = ebola1976
)

# see the first few rows
head(rolling_cfr_naive)

# Calculate the rolling daily CFR while correcting for delays
rolling_cfr_corrected <- cfr_rolling(
  data = ebola1976,
  delay_density = function(x) dgamma(x, shape = 2.40, scale = 3.33)
)

head(rolling_cfr_corrected)
```

We plot the rolling CFR to visualise how severity changes over time, using the [_ggplot2_ package](https://ggplot2.tidyverse.org/). The plotting code is hidden here.

```{r}
# combine the data for plotting
rolling_cfr_naive$method <- "naive"
rolling_cfr_corrected$method <- "corrected"

data_cfr <- rbind(
  rolling_cfr_naive,
  rolling_cfr_corrected
)
```

```{r fig-rolling-cfr-ebola, echo=FALSE, fig.cap="Disease severity of ebola in the 1976 outbreak estimated on each day of the epidemic. The rolling CFR value converges to the static value towards the end of the outbreak. Both corrected and uncorrected estimates are shown."}
library(ggplot2)

# visualise both corrected and uncorrected rolling estimates
ggplot(data_cfr) +
  geom_ribbon(
    aes(
      date,
      ymin = severity_low, ymax = severity_high,
      fill = method
    ),
    alpha = 0.2, show.legend = FALSE
  ) +
  geom_line(
    aes(date, severity_estimate, colour = method)
  ) +
  scale_colour_brewer(
    palette = "Dark2",
    labels = c("Corrected CFR", "Naive CFR"),
    name = NULL
  ) +
  scale_fill_brewer(
    palette = "Dark2"
  ) +
  scale_x_date(
    date_labels = "%d-%b-%Y",
    name = "Date"
  ) +
  labs(
    y = "Disease severity"
  ) +
  theme_classic() +
  theme(legend.position = "top")
```

## Package vignettes

More details on how to use _{{ packagename }}_ can be found in the [online documentation as package vignettes](https://epiverse-trace.github.io/{{ packagename }}/), under "Articles".

## Help

To report a bug please open an [issue](https://github.com/{{ gh_repo }}/issues/new/choose).

## Contribute

Contributions to _{{ packagename }}_ are welcomed. Please follow the [package contributing guide](https://github.com/{{ gh_repo }}/blob/main/.github/CONTRIBUTING.md).

## Code of conduct

Please note that the _{{ packagename }}_ project is released with a [Contributor Code of Conduct](https://github.com/epiverse-trace/.github/blob/main/CODE_OF_CONDUCT.md). By contributing to this project, you agree to abide by its terms.

## Related projects

_cfr_ functionality overlaps with that of some other packages, including

- [_coarseDataTools_](https://cran.r-project.org/package=coarseDataTools) is an R package that allows estimation of relative case fatality risk between covariate groups while accounting for delays due to survival time, when numbers of deaths and recoveries over time are known. _cfr_ uses simpler methods from @nishiura2009 that can be applied when only cases and deaths over time are known, generating estimates based on all data to date, as well as time-varying estimates. _cfr_ can also convert estimates of cases with known outcomes over time into an estimate of under-ascertainment, if a baseline estimate of fatality risk is available from the literature (e.g. from past outbreaks). 
- [_EpiNow2_](https://cran.r-project.org/package=EpiNow2) is an R package that can allow estimation of case fatality risk if it is defined as a secondary observation of cases. In particular, it allows for estimation that accounts for the smooth underlying epidemic process, but this requires additional computational effort. A comparison of these methods is planned for a future release.

_cfr_ is in future expected to benefit from the functionality of the forthcoming [_epiparameter_ package](https://epiverse-trace.github.io/epiparameter/), which is also developed by Epiverse-TRACE. _epiparameter_ aims to provide a library of epidemiological parameters to parameterise delay density functions, as well as the convenient `` class to store, access, and pass these parameters for delay correction.

## References

Owner

Name: Epiverse-TRACE
Login: epiverse-trace
Kind: organization

Website: https://epiverse.org
Repositories: 17
Profile: https://github.com/epiverse-trace

Citation (CITATION.cff)

# --------------------------------------------
# CITATION file created with {cffr} R package
# See also: https://docs.ropensci.org/cffr/
# --------------------------------------------
 
cff-version: 1.2.0
message: 'To cite package "cfr" in publications use:'
type: software
license: MIT
title: 'cfr: Estimate Disease Severity and Case Ascertainment'
version: 0.2.0
doi: 10.32614/CRAN.package.cfr
abstract: Estimate the severity of a disease and ascertainment of cases, as discussed
  in Nishiura et al. (2009) <https://doi.org/10.1371/journal.pone.0006852>.
authors:
- family-names: Gupte
  given-names: Pratik R.
  email: pratik.gupte@lshtm.ac.uk
  orcid: https://orcid.org/0000-0001-5294-7819
- family-names: Kucharski
  given-names: Adam
  email: adam.kucharski@lshtm.ac.uk
  orcid: https://orcid.org/0000-0001-8814-9421
- family-names: Russell
  given-names: Tim
  email: timothy.russell@lshtm.ac.uk
  orcid: https://orcid.org/0000-0001-5610-6080
repository: https://CRAN.R-project.org/package=cfr
repository-code: https://github.com/epiverse-trace/cfr
url: https://epiverse-trace.github.io/cfr/
contact:
- family-names: Kucharski
  given-names: Adam
  email: adam.kucharski@lshtm.ac.uk
  orcid: https://orcid.org/0000-0001-8814-9421
keywords:
- case-fatality-rate
- epidemic-modelling
- epidemiology
- epiverse
- health-outcomes
- outbreak-analysis
- r
- r-package
- sdg-3
references:
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  title: 'R: A Language and Environment for Statistical Computing'
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  year: '2025'
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  notes: Imports
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    email: michellang@gmail.com
    orcid: https://orcid.org/0000-0001-9754-0393
  year: '2025'
  doi: 10.32614/CRAN.package.checkmate
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  title: stats
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  institution:
    name: R Foundation for Statistical Computing
    address: Vienna, Austria
  year: '2025'
- type: software
  title: bookdown
  abstract: 'bookdown: Authoring Books and Technical Documents with R Markdown'
  notes: Suggests
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  authors:
  - family-names: Xie
    given-names: Yihui
    email: xie@yihui.name
    orcid: https://orcid.org/0000-0003-0645-5666
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  abstract: 'data.table: Extension of `data.frame`'
  notes: Suggests
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  repository: https://CRAN.R-project.org/package=distributional
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  abstract: 'dplyr: A Grammar of Data Manipulation'
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    email: hadley@posit.co
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    email: hadley@rstudio.com
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    given-names: Yihui
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  year: '2025'
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  authors:
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    given-names: Stefan Milton
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  abstract: 'purrr: Functional Programming Tools'
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  authors:
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    given-names: Hadley
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  notes: Suggests
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    given-names: Hadley
    email: hadley@posit.co
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  year: '2025'
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Packages

Total packages: 1
Total downloads:
- cran 324 last-month

Total dependent packages: 0
Total dependent repositories: 1
Total versions: 4
Total maintainers: 1

cran.r-project.org: cfr

Estimate Disease Severity and Case Ascertainment

Homepage: https://github.com/epiverse-trace/cfr
Documentation: http://cran.r-project.org/web/packages/cfr/cfr.pdf
License: MIT + file LICENSE
Latest release: 0.2.0
published 12 months ago

Versions: 4
Dependent Packages: 0
Dependent Repositories: 1
Downloads: 324 Last month

Rankings

Stargazers count: 15.8%

Forks count: 17.0%

Dependent repos count: 23.8%

Dependent packages count: 28.7%

Average: 32.7%

Downloads: 78.3%

Maintainers (1)

adam.kucharski@lshtm.ac.uk

Last synced: 6 months ago

Dependencies

.github/workflows/R-CMD-check.yaml actions

actions/checkout v3 composite
r-lib/actions/check-r-package v2 composite
r-lib/actions/setup-pandoc v2 composite
r-lib/actions/setup-r v2 composite
r-lib/actions/setup-r-dependencies v2 composite

.github/workflows/pkgdown.yaml actions

JamesIves/github-pages-deploy-action v4.4.1 composite
actions/checkout v3 composite
r-lib/actions/setup-pandoc v2 composite
r-lib/actions/setup-r v2 composite
r-lib/actions/setup-r-dependencies v2 composite

.github/workflows/render_readme.yml actions

actions/checkout v3 composite
r-lib/actions/setup-pandoc v2 composite
r-lib/actions/setup-r v2 composite
r-lib/actions/setup-r-dependencies v2 composite

.github/workflows/test-coverage.yaml actions

actions/checkout v3 composite
actions/upload-artifact v3 composite
r-lib/actions/setup-r v2 composite
r-lib/actions/setup-r-dependencies v2 composite

DESCRIPTION cran

R >= 3.5.0 depends
checkmate * imports
stats * imports
bookdown * suggests
covidregionaldata * suggests
dplyr * suggests
epiparameter * suggests
forcats * suggests
ggplot2 * suggests
incidence2 * suggests
knitr * suggests
outbreaks * suggests
pak * suggests
purrr * suggests
rmarkdown * suggests
scales * suggests
spelling * suggests
testthat >= 3.0.0 suggests
tidyr * suggests
usethis * suggests

ecosyste.ms

Data

Tools

Indexes

Applications

Experiments

Open Source Science

cfr