about project cyclic model analysis on sequential patterns

Question

It is a shopping project. In this project we are calculating the time difference in periodical item sets (if an item a is brought & after 3 days item b is brought then we calculate the all time difference of such periodicity). In my project paper there are 4 algorithms are there Trend Distribution function, Generalized periodicity detection, trend modeling & cyclic model analysis. In paper there is a formula f(x)=(24-x)/18*(sin(x)+1.5).(x,f(x)) are coordinates of graph. No much more is given about x&f(x) can you help me what is x & f(x)?

manoj ps · Answer

x is time intervals values of x axis such that for x(1 hour) difference how many times the items buys.. f(x) is a trend distribution of two items.. ex: if item a is purchased at 1 'o clock and item b is purchased at 2'o clock and again at 34 and 5'0 clock so for 1 hr interval x =1 hrthen f(1)=1 x=2 hr f(2)=1 x=3 f(3)=1 x=4 f(4)=1. if item a is purchased at 3 'o clock n item b is purchased at 4'o clock then for 1 hr interval x =1 hrthen f(1)=2 means for 1 hr difference this pattern occurs twice...