If you’re trying your first machine learning algorithm, there are some formulas that will be useful to you (that might be overwhelming to learn at first). All machine learning algorithms are governed by a set of conditions, and your job is it make sure your algorithm fits the assumptions to ensure superior performance. There are different algorithms for different conditions. For example, don’t even try to use linear regression on a categorical dependent variable or you will be disappointed with low values of R² and F statistics. Instead, use algorithms like Logistic Regression, Decision Trees, SVM, and Random Forest. Here is a good reading to get a better sense of these algorithms: Essentials of Machine Learning Algorithms.
For beginners, I also highly recommend this website that talks through some of the programs that can be done in R:
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