Dear All

I hope everyone is fine. I had a rectangular space. In divided it into x and y cells. Then I collected data (temperature) for every cell at equal time intervals and performed density averagaing for all the space. Thus I have overall average value of a variable for whole space now. I wish to perform statistical analysis. Searching google suggests AUTOCORRELATION of the collected data. I am unaware of the following.

1. AUTOCORRELATION FUNCTION

2. EULER'S & LAGRANGE'S AUTOCORRELATION FUNCTIONS (my case is euler)

3. Anything else related to above 2 points.

I need help. Can anyone suggest me any simple literature for the said problem explicitely giving definitions, concepts and mathematical equations for computer implementation?

Thanks to all.