1 - Data. Import and clean the data. Format the data to use appropriate variable names; fill in missing values with data where appropriate (as indicated in the header information); create character and ordered factors for categorical variables. Briefly describe the data cleaning process and the resulting dataset, identifying key variables based on your understanding of the original scientific report. How many participants are included? What is the age and gender distribution (a human-readable table may help here)? Note (but don't correct) issues in the available data - in particular, whether categorical variables in the dataset correctly implement the definitions based on underlying continuous variables. Use tables, figures, or specific examples (i.e. data for particular subjects) as needed to illustrate these issues. what this mean (don't correct??)