You are doing Regression Analysis on Marriage, Children and Class on Happiness over time.
Regression Analysis assumes that one variable is dependent upon: A) another single independent variable (Simple Regression) , or B) multiple independent variables (Multiple Regression).
STATA Regression Analysis - if you are doing your analysis with it - you need to be following how it works, and how to work with its results.
Simple Linear Regression in STATA https://www.youtube.com/watch?v=HafqFSB9x70this video analyzes data with Marriage, and education level (I am not sure what you used for "class", this could be educational thought of as educational level or job level)
Body Image - https://www.youtube.com/watch?v=Xn-MlnzROis This video describes the variable Body Image - which is similar to Happiness - it is a basic intro to setting up a variable note: Body Image uses 5 groups (very underweight, slightly underweight, about the right weight, slightly overweight, very overweight) where your Happiness uses very happy, happy, not too happy.
Stata Tutorial Multiple Linear Regression - I turn on the CC because some of the speakers have an accent - and I want to make sure I understand https://www.youtube.com/watch?v=NbSjQ0n-Gss this example uses the Resources of Age, Income, Gender - yours are Class, Marriage and possibly Children that you compare over time.
This link is for the 144 videos in the Stata & Regression analysis playlist https://www.youtube.com/playlist?list=PLpgxJDBR6rdOoLs-6_In2hpDkAO4drXLx don't want you to feel overwhelmed - this is a quick way to scroll through the topic list, you can quickly see if a video is covering the concept you need by:
· Turning on CC - Closed Captions so you can see what each lesson is saying
· Fast Forward, Rewind, See when screen changes and see final outcome
· Enlarge the screen - so you can see exactly what the screen image is and where the presenter is clicking to get the results, or enter data.
If you enjoy any of these presenters, many of them have their own channels - which display all their videos.