I program in several languages, mainly .NET, PHP. But i make some projects in Java, Python and C. I have no problem to learn a new languaje.

About the techniques, I am sure that my data have any patron because for example if in april down the sales sure same month (April) of previous years too down the sales.

I think first i should make a descriptive analisys to understand the data. ¿Correct? later in function of the descriptive analisys result i take a decision for the next method

if the last paragraph is correct, ¿what need to start? i have seen something about R

Thank you

I think first i should make a descriptive analisys to understand the data. ¿Correct? later in function of the descriptive analisys result i take a decision for the next method

if the last paragraph is correct, ¿what need to start? i have seen something about R

Thank you

if the last paragraph is correct, ¿what need to start? i have seen something about R

Thank you

About the techniques, I am sure that my data have any patron because for example if in april down the sales sure same month (April) of previous years too down the sales.

Reading this thread I was not certain what your question was.

Any tutorial for first steps?

1) Start with mean and standard deviation of your data.

2) Sort your data (high to low), then see if there is a pattern. eg 3 of the top 5 months are April, or 7 of the top 10 months occurred in 2011 (after event ...)

Just get acquainted with your data. You may want to also try

1b) Mean and standard deviation of your data according to some quality, eg mean for month of July, mean for year of 2008.