hi,
I have several items for which i have a quantity and the end of each month:
| |JAN |FEB |MAR |APR |
|item A | 10| 20| 15| 17|
|item B | 30| 35| 37| 38|
for each item i would like to have the coef of the linear regression in purpose to see if the trend is positive or negative.
In some cases, i do not have the value for each month
does someone can help?