Hi. I have to create a dummy variable which is zero if a variable "x1"=0 and it is egual to 1 if x2, x3 and x4 take on value equal to 1. But, I can't use &. The original formula is:
Sum of 􏰵YES􏰶 ans􏰷ers to the follo􏰷ing three survey questions on whether the firm has access to/uses:
  1. 1) IT systems for internal information management;
  2. 2) IT systems for e-commerce;
  3. 3) IT systems for management of the sales/purchase network
And It's equal to zero when c2 is zero.

The problem is, how it is described in the photo uploaded, that values equal to zero change when I replace values equal 1.
Thank you.