What is regression? How can it be helpful in understanding the relationship between two variables?
- Do you ever wonder about…the correlation between variables?…Whether they're somehow related?…Well, a regression helps us investigate…the relationship between two variables.…For example, let's take a look at a couple of questions…that are asked pretty frequently about education.…Does education level impact lifetime earnings?…Or, does more studying improve test scores?…We can infer some things about these questions…through the use of regression.…The basics are pretty simple.…
Usually, we express this graphically…with a simple scatter plot.…So to begin, on the X axis we have one variable,…study time.…On our Y axis we have a second variable, exam score.…Let's say these are our data points.…So now, we sprinkle our data points onto our graph.…Once we have our data points, the goal of regression…is to help us find a line that will fit our data points.…
Now, obviously, we aren't going to have a single line…that can hit every one of these data points,…so regression analysis tries to find the formula…for the line that will best fit this distribution.…
- Working with small sample sizes
- Using t-statistic vs. z-statistic
- Calculating confidence intervals with t-scores
- Comparing two populations (proportions)
- Comparing two population means
- Chi-square testing
- ANOVA testing
- Regression testing
Skill Level Advanced
1. The Statistics Series: A Look Back and Forward
2. Small Sample Sizes
T-statistic vs. z-statistic3m 44s
3. Comparing Two Populations (Proportions)
4. Comparing Two Populations (Means)
6. ANOVA: Analysis of Variance
7. Introduction to Regression
Next steps1m 40s
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