Link to YouTube Channel

• Boxplot
1. Boxplot (part 1: introduction to boxplot)
2. Boxplot (part 2: Mathematics (upper adjacent value)
3. Boxplot (part 3: Mathematics (lower adjacent value)
• Common statistical tests used in Table 1 in scientific articles
1. Overview of common statistical tests used in Table 1 in scientific articles
• Directed Acyclic Graph (DAG)
1. A big picture of DAG
• Epidemiology: How to handle unmeasured confounding
1. Overview (bias analysis, bounding factor, E-value and G-value
• Kappa statistic
1. Part 1: introduction to Kappa statistic and underlying mathematics of kappa statistics
2. How to interpret Kappa statistics (not ready at the moment)
• Normal distribution
1. Introduction to QQ plot and normal QQ plot
2. Underlying mathematics of Q-Qnorm plot
3. Q-Qnorm plot in Stata
4. Downloadable files on Q-Qnorm plot in Stata
• qqnormEx1.dta
• qqnormEx2.dta
• qqnormEx3.dta
• qqnormEx4.dta
• qqnormStata.do
5. Q-Qnorm plot in R (not ready at the moment)
6. Q-Qnorm plot in Python (not ready at the moment)
7. Why Q-Qnorm plots produced by R and Stata different?
• Formulas used by R and Stata for calculating cumulative probabilities are different. (not ready at the moment)
• Normal distributions used by R and Stata are different (not ready at the moment)
• Ranges of x axis between R and Stata are different (not ready at the moment)
• Labels for x axis and y axis used by R and Stata are different (not ready at the moment)
• Reference lines used by R and Stata are different. (not ready at the moment)
• Distances from coordinates to reference in R and Stata are different. (not ready at the moment)
• Pearson's chi-squared test and Fisher's exact test
1. Pearson's chi-squared test (part 1: introduction)
2. Pearson's chi-squared test (part 2: row- and column-wise calculations)
3. Pearson's chi-squared test (part 3: validity of Pearson’s chi-squared test)
4. Fisher's exact test (part 1: background)
5. Fisher's exact test (part 2: make a list of all scenarios)
6. Fisher's exact test (part 3: mathematics underlying Fisher’s exact test)
7. Fisher's exact test (part 4: detailed probability calculations) not ready at the moment
8. Fisher's exact test (part 5: 2-sided and 1-side Fisher's exact test p-values)
9. Pearson's chi-squared test and Fisher's exact test in Stata
10. Pearson's chi-squared test and Fisher's exact test in R
11. Downloadable files on chi-squared test used by the YouTube channel
• vaccine400.dta
• vaccine40.dta
• chi2.do
• chi2.R