Creating Variables

[Tobiasp94]

I have uploaded a dataset with multiple variables into SAS Studio. These variables varies across time. 
For instance i need to create one variable population instead of 7 variables:

Population <- Population_2010 + Population_2011 + .... 

Hope someone can help.

[andreas_lds]

It is recommend to avoid data in variable-names. Having one variable with the year and another with the value allows easier usage of the data. If you have to create a dataset with those year-variables you need to post a data-step with datalines statement showing the data you have. This post explains how to transform data into a data-step.

[RW9]

Note I am assuming your data here:

data have;
  country="UK";
  population_2010=10;
  population_2011=20;
  output;
  country="US";
  population_2010=15;
  population_2011=25;
  output;
run;
proc transpose data=have out=want;
  by country;
  var population_:;
run; 

[Patrick]

Here a data step option to also populate a Year variable.

data have;
  country="UK";
  population_2010=10;
  population_2011=20;
  output;
  country="US";
  population_2010=15;
  population_2011=25;
  output;
run;
data want(drop=_: population_:);
  set have;
  length year $4 pop_count 8;
  array _pop {*} population_:;
  do _i=1 to dim(_pop);
    year=scan(vname(_pop[_i]),2,'_');
    pop_count=_pop[_i];
    output;
  end;
run;