Light therapy is usually started in the fall and continued through spring. When you begin light therapy, your first response will show you whether you need to adjust the intensity or duration. Many people respond to light therapy within 3 to 5 days.
Psychographics is a marketing demographic method used to analyze market segmentation. (The population demography of a specific market) It relates to the lifestyles, attitudes, beliefs, buying motivation, product usage requirements, and product perceptions.
This means that the Markov chain may be modeled as a n*n matrix, where n is the number of possible states. An example of a process which may be modeled by a Markov chain is the sequence of faces of a die showing up, if you are allowed to rotate the die wrt an edge. The corresponding matrix is. As usual, Wikipedia and MathWorld are your friends. share | cite | improve this answer.