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Note:
This
month's free resource list comes to us from our friends at
Epi Centre
Here is a list of free
online epidemiologic and statistical calculators. These are free
programs that are available online through use of a browser and
therefore do not require installation of software. These programs can
be useful for a number of purposes:
1. In
teaching epidemiology and biostatistics, students can use these simple
calculators and focus on the interpretation of the results. Sometimes
when students need to write programs to get the answers, such R or SAS,
the focus is on the programming and less on interpretation.
2. For
analyzing data, sometimes the raw data is not available and these
calculators provide a simple was to perform the analysis. Note that
most statistical programs can deal with reading summary data but
frequently this takes more time than just plugging the summary data in
a calculator.
3. Some
calculators provide statistical analysis output that might not be
available in some statistical programs.
I have used many of
these programs over the years and used ChatGPT to identify other
similar programs which are in the list below. Let me know if of your
thoughts on these programs and if you know of the useful programs.
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Calculator |
Primary Focus |
Selected Capabilities |
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1. |
OpenEpi |
Epidemiology |
2×2 tables, stratified analysis, rates,
proportions, diagnostic tests, sample size/power, matched
case-control, ANOVA, dose-response |
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2. |
OpenEpiSheets |
Epidemiology |
Epidemiologic/biostatistical calculators
implemented in Google Sheets; sample size, analysis, and power
(Beta version) |
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3. |
Epitools – Ausvet |
Epidemiology |
2×2 and stratified analysis, prevalence, diagnostic
tests, cohort/case-control sample size, surveillance, pooled
testing |
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4. |
Statulator |
Epidemiology
Biostatistics |
Sample size, CIs, hypothesis tests, stratified
analysis, CSV dataset analysis, graphics |
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5. |
EpiCalc – PHT Lab |
Epidemiology |
Attack rates,
OR/RR, DALYs, vaccine efficacy, screening test performance (Se/Sp/PPV/NPV),
an SIR/SEIR epidemic simulator, and a general biostatistics suite
(sample size, t-test, chi-square, ANOVA) |
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6. |
EpiStat – PHT Lab |
Epidemiology |
Stratified analysis (Mantel-Haenszel), R x C
tables, SMR, matched case-control, dose-response, WHO child-growth
standards, and other statistics |
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7. |
EpiPlus – PHT Lab |
Epidemiology
Biostatistics |
Design effect, cluster/stratified sample size,
DALYs, PAF, standardization, VE, NNT/NNH, Poisson regression,
meta-analysis |
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8. |
Wepisia |
Epidemiology |
OpenEpi-derived calculations plus epidemic
simulation, mapping and in-browser R, in French |
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9. |
MedCalc Online Calculators |
Medical
statistics |
Means, proportions, rates, RR, OR, NNT, diagnostic
tests, ROC, sample size/power |
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10. |
GraphPad QuickCalcs |
Biostatistics |
Fisher exact, chi-square, McNemar, proportion CI,
NNT, t tests, regression, distributions |
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11. |
Sample-Size.net – UCSF |
Sample Size /
Clinical research |
Proportions, means, RR, diagnostic tests, clustered
designs, logistic regression, survival, precision |
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12. |
ClinCalc |
Clinical statistics |
Sample size, power, NNT, OR-to-RR conversion,
fragility index |
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13. |
SRUC Sample Size Calculator |
Veterinary
epidemiology |
Prevalence estimation, disease detection and
epidemiologic sample-size calculations |
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14. |
Social Science Statistics |
General statistics |
t tests, ANOVA, chi-square, Fisher exact,
proportions, correlation, nonparametric tests, regression, power |
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15. |
VassarStats |
General
statistics |
t tests, contingency tables, proportions, ANOVA,
regression, correlation and other statistical procedures |
For more information
or to provide additional tools for this list, please contact Epi
Centre as follows:
Kevin S.
Epi.Center.Org@gmail.com
https://sites.google.com/view/epi-centre-org |
