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Prevalence: Simple Explanation + Examples – …

WEBIn 2018, in the WHO African region, 3.9% of adults had HIV. World Health Organization. Here, 3.9% is the point prevalence. Prevalence is not always reported as a percentage, …

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URL: https://quantifyinghealth.com/prevalence/

Risk Difference, Relative Risk and Odds Ratio

WEBThe more common the disease, the larger is the gap between odds ratio and relative risk. In our example above, p wine and p no_wine were 0.009 and 0.012 respectively, so the …

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How to Run a Logistic Regression in R tidymodels

WEBAbout Me. I am Georges Choueiry, PharmD, MPH, and PhD student in epidemiology. I created this website to help researchers conduct studies from concept to publication.

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How to Report Interaction Effects in Regression

WEBFor a linear regression model: Y = β 0 + β 1 X + β 2 Z + β 3 XZ + ε. If the coefficient of the interaction term β 3 is statistically significant, then there is evidence of an interaction …

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Stepwise (Linear & Logistic) Regression in R – QUANTIFYING …

WEBAbout Me. I am Georges Choueiry, PharmD, MPH, and PhD student in epidemiology. I created this website to help researchers conduct studies from concept to publication.

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5 Real-World Examples of Confounding [With References]

WEBConfounding is an example of such mechanism that alters the relationship between X and Y, and therefore, leads to an over or underestimation of the true effect between them. In …

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7 Different Ways to Control for Confounding

WEBStep 1: Start by splitting the data into multiple subgroups (a.k.a. strata) according to the different categories of the confounding variable. Step 2: Within each subgroup (or …

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When to Use Regression Analysis (With Examples)

WEBThe takeaway message is that regression analysis enabled them to quantify that association while adjusting for smoking, alcohol consumption, physical activity, …

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How to Handle Missing Data in Practice: Guide for Beginners

WEBHandling missing data involves 2 steps: To start, here is a decision tree to help you determine the type of missing data for each variable in your study (step 1): Next, use …

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Posttest-Only Control Group Design: An Introduction

WEBIn 1993, Topf and Davis used a posttest-only control group design to examine if CCU (Critical Care Unit) noise affects REM (Rapid Eye Movement) sleep. So they randomly …

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Randomized Block Design: An Introduction – QUANTIFYING HEALTH

WEBA randomized block design is a type of experiment where participants who share certain characteristics are grouped together to form blocks, and then the treatment (or …

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Solomon Four-Group Design: An Introduction

WEBThe Solomon four-group design is a type of experiment where participants get randomly assigned to either 1 of 4 groups that differ in whether the participants receive the …

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How to Start a Methods Section in Research

WEBStart by mentioning the date, duration, and place of the study. For example: “This cross-sectional study was a part of the Student Mental Health Survey that was conducted at …

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Case Report: A Beginner’s Guide with Examples

WEBA case report is a descriptive study that documents an unusual clinical phenomenon in a single patient. It describes in details the patient’s history, signs, symptoms, test results, …

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Interpret Log Transformations in Linear Regression

WEBA 1 unit increase in X is associated with an average change of 100×β1% in Y. Log-log model. log(Y) = β0 + β1 log(X) A 1% increase in X is associated with an average change …

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What is an Acceptable Value for VIF

WEBHere’s the formula for calculating the VIF for X 1: R 2 in this formula is the coefficient of determination from the linear regression model which has: In other words, R 2 comes …

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How to Start a Research Title

WEBThe most common 3-word phrases to start a title. Three-word phrase. Number of occurrences. (in 105,975 titles) Percent of occurrences. The role of…. 412. 0.39%. The …

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P-Value: A Simple Explanation for Non-Statisticians

WEBA p-value is a probability, a number between 0 and 1, calculated after running a statistical test on data. A small p-value (< 0.05 in general) means that the observed results are so …

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Statistical Software Popularity in 40,582 Research Papers

WEBMost popular statistical packages overall. The table below can be read in the following way: For instance, SPSS was reported to be used in 16,616 out of 40,582 research papers (= …

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