my name is Betty and I'm new at this. I want to make a set analysis where I compare this years sale to last years sale and I want to start from January. I've actually made one, but can't seem to figure out how to make it start from january. Can you please help me out a little? =)
This is the expression I've written (know that I don't use dollar signs since I' m a swede):
Also, this store opened 2014 and so I only have sales information from 2014-2015, but let's say that 2016 comes. I don't want to have to write another expression only for that year. Is there also a better way to make an expression that will apply to all years?