`pdf_data` is an n x p matrix, where n is the number of PDFs and p matches the length of x_grid. x_grid contains the points at which the PDFs are evaluated (assumed equally spaced apart).
Details
`pdf_data` is a data frame with 1,000 rows and 5 columns.
`x_grid`; is a timestamp of each of `full_data`'s 1,000 rows.