# \#epi

**URL:** https://discourse.datamethods.org/tag/epi/40.md

[Latest](https://discourse.datamethods.org/latest.md) · [Categories](https://discourse.datamethods.org/categories.md) · [Tags](https://discourse.datamethods.org/tags.md)

---

## [Is it the numerator or denominator which explains variations of a ratio?](https://discourse.datamethods.org/t/is-it-the-numerator-or-denominator-which-explains-variations-of-a-ratio/5600)

<div class="topic-metadata">

**Author:** [@marcusbendtsen](https://discourse.datamethods.org/u/marcusbendtsen)\
**Replies:** 1\
**Last updated:** [May 11, 2022, 10:44am UTC](https://discourse.datamethods.org/t/is-it-the-numerator-or-denominator-which-explains-variations-of-a-ratio/5600 "2022-05-11T10:44:32Z")

</div>

We are studying a collection of reports which account for the number of diagnosed cases of a disease at different hospitals pre- and during the Covid-19 pandemic. Cases are counted over comparable time intervals (for ins…

---

## [Calculating years of life lost due to COVID-19](https://discourse.datamethods.org/t/calculating-years-of-life-lost-due-to-covid-19/4413)

<div class="topic-metadata">

**Author:** [@tamas.ferenci](https://discourse.datamethods.org/u/tamas.ferenci)\
**Replies:** 3\
**Last updated:** [June 10, 2021, 9:43pm UTC](https://discourse.datamethods.org/t/calculating-years-of-life-lost-due-to-covid-19/4413 "2021-06-10T21:43:30Z")

</div>

Many study attempts to measure the years of life lost (YLL) due to COVID-19 (see eg. Arolas et al or Quast et al) using life tables to calculate the number of years lost for each death as the average number of years of l…

---

## [Investigate parallel observational cohort or leave alone?](https://discourse.datamethods.org/t/investigate-parallel-observational-cohort-or-leave-alone/3361)

<div class="topic-metadata">

**Author:** [@MLB](https://discourse.datamethods.org/u/MLB)\
**Replies:** 0\
**Last updated:** [May 18, 2020, 10:11pm UTC](https://discourse.datamethods.org/t/investigate-parallel-observational-cohort-or-leave-alone/3361 "2020-05-18T22:11:27Z")

</div>

Our team just completed a RCT of an emergency therapy with a high mortality rate in which we randomized 1/3 of eligible patients (just over 300). Another 1/3 of the eligible patients consented to an observational “arm” i…

---

## [Comparing continuous outcome in case-control-style design](https://discourse.datamethods.org/t/comparing-continuous-outcome-in-case-control-style-design/3053)

<div class="topic-metadata">

**Author:** [@mdonoghoe](https://discourse.datamethods.org/u/mdonoghoe)\
**Replies:** 2\
**Last updated:** [March 6, 2020, 8:30pm UTC](https://discourse.datamethods.org/t/comparing-continuous-outcome-in-case-control-style-design/3053 "2020-03-06T20:30:28Z")

</div>

A colleague has collected data in a case-control(-style) design: They approached adults who had experienced a particular illness in childhood (“cases”), and separately recruited a similar number of ‘healthy’ adults (“co…

---

## [Time-to-event analysis in nested case-control designs](https://discourse.datamethods.org/t/time-to-event-analysis-in-nested-case-control-designs/3010)

<div class="topic-metadata">

**Author:** [@albertoca](https://discourse.datamethods.org/u/albertoca)\
**Replies:** 0\
**Last updated:** [February 16, 2020, 1:11pm UTC](https://discourse.datamethods.org/t/time-to-event-analysis-in-nested-case-control-designs/3010 "2020-02-16T13:11:00Z")

</div>

I would like to ask for ideas on nested case-control study analysis for time-to-event analysis in the presence of competing risks. For example, a database with 500 cancer patients with thrombosis (cases), and 500 cancer…

---

## [Using R for epidemiology stats](https://discourse.datamethods.org/t/using-r-for-epidemiology-stats/2865)

<div class="topic-metadata">

**Author:** [@Keno\_Mentor](https://discourse.datamethods.org/u/Keno_Mentor)\
**Replies:** 4\
**Last updated:** [January 14, 2020, 8:24am UTC](https://discourse.datamethods.org/t/using-r-for-epidemiology-stats/2865 "2020-01-14T08:24:44Z")

</div>

So I’m doing a meta-analysis for the first time and I’m trying to get through some new (to me) statistical techniques using R. To test whether I’m used the code correctly, I’ve been using a few of the studies absolute da…

---

## [About the epidemiology category](https://discourse.datamethods.org/t/about-the-epidemiology-category/83)

<div class="topic-metadata">

**Author:** [@f2harrell](https://discourse.datamethods.org/u/f2harrell)\
**Replies:** 0

</div>

Epidemiology, especially related to particular epidemiologic studies and study designs

---

## [About the nutrition category](https://discourse.datamethods.org/t/about-the-nutrition-category/82)

<div class="topic-metadata">

**Author:** [@f2harrell](https://discourse.datamethods.org/u/f2harrell)\
**Replies:** 0

</div>

Nutrition research including nutritional epidemiology