**First** you will need to download the program MATLAB. The instructions vary whether you are a university student, employee etc. Go to https://www.mathworks.com/help/install/ug/download-without-installing.html for more detailed instructions. Regardless of your occupation, you can buy MatLab home at https://www.mathworks.com/store/link/products/home/new?s_iid=htb_buy_gtwy_cta4, though it is quite expensive ($149). You must *also* make sure to download/buy the "Statistics and Machine Learning Toolbox".

Once you've downloaded MatLab, **next** ensure that your data is in a "csv" or "parquet" file, and find the file path.

**Then**, open the program MatLab. There should be a "Command Window" at the front and center with `>>>`. Click after the `>>>` so that you can type into the text area.

**Then**, type in `path = '`, the path to your data file, `';` (end single quote and semicolon), and hit "return". Make sure to type what's in the code blocks exactly, as extra characters or missing quotes/semicolons will cause a syntax error.

**Finally** copy/paste the below code into the text area and hit "return".

```matlab
% Import data from a CSV file
data = readtable(data_path);
% Define the fixed effects formula
fixedEffectsFormula = 'response ~ predictor1 + predictor2';
% Define the random effects structure
randomEffectsStructure = '(1 | groupingVariable)';
% Combine fixed and random effects into a single formula
modelFormula = [fixedEffectsFormula, ' + ', randomEffectsStructure];
% Fit the linear mixed effects model
lme = fitlme(data, modelFormula);
% Display the lme coefficients
lme.Coefficients
% Display the fixed effects
lme.FixedEffects
% Display the random effects
lme.RandomEffects
% Perform the ANOVA "hypothesis test" to ensure the data is good
anova(lme)
```

You should see the values of `lme.Coefficients`, `lme.FixedEffects`, `lme.RandomEffects`, and `anova(lme)` below their respective lines. Congratulations! You have successfully run a linear mixed effects model in matlab, and printed the results!

Unfortunately, it will require some understanding of coding and computers to actually interpret these results. But you can always ask a chatbot like me and I will do my best to explain them in a human-friendly way. And as always, don't hesitate to ask me if you need further clarification for any of these steps, or encounter a "syntax error" or other unexpected roadblock.
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