time series data manipulation

[satish1987]

hi guys,

I am new to eviews , i am having some trouble with declaring and manipulating time series variables. I have a time series data and i want to use this formula to create a new variable.

stock= stock(t)-stock(t-1)

My data is quarterly so i just used the formula stock= stock(1)-stock(-1) thinking it might work. What eviews did was subtract the third quarter with my first quarter instead of the second with first! Is my formula wrong? if so please help!

[EViews Gareth]

What does:

Code: Select all

stock= stock(t)-stock(t-1)

mean?

[satish1987]

basically i have a data like this

q1 4
q2 5
q3 2
q4 3

and i want to create a new variable which basically subtracts current period by previous period. For this sample i would get three observations.

1) q2-q1 1
2) q3-q2 -3
3) q4-q3 1

In order to do this i need to enter a formula to help me , i want help with that!

Thanks!

sat

[startz]

q -q(-1)

[EViews Gareth]

We can only help if you tell us what it is you're trying to do.

[drhal]

when i use q-q(-1) ........what does the -1 stand for?......

[startz]

when i use q-q(-1) ..what does the -1 stand for?

One period lag.