Nov. 14, 2011 -- Mini strokes, with symptoms that last just a few minutes or hours, are well-recognized warning signs for potentially deadly larger strokes. Now new research confirms that they are associated with a lower life expectancy.
A cross section is the shape we get when cutting straight through an object. The cross section of this object is a triangle. It is like a view into the inside of something made by cutting through it.
I Each cross-section is representative, but unlikely that any given. individual appears in more than one cross section. I Panel Data contains repeated observations on the same units. over time. I data tracks individuals over time. each individual iobserved at. time t=;1;:::;T.