# Creating a Normalization Factor

I have a relatively simple problem that I can't seem to find a satisfactory solution to. If I have three scales for three different sets of data. One varies from [-5,5] the other from [1,10], and the last from [-10,10] what would an appropriate way to make a single scale for data from all three sets of data?

• It depends on the purpose: why do you need a single scale?
– whuber
Commented Nov 6, 2013 at 21:23
• @whuber Sorry, the idea is to use the scale to actually compare values in each set of data. I want to know why one set of data has the letter A as a 5 for example while another has it at a 4. Right now the fact that one set gives it a 5 and the other a 4 can be chalked up to the fact that they are on different scales.
– asdf
Commented Nov 7, 2013 at 17:13
• Your comment is mystifying because it assumes we know what your data are about, but you haven't stated that. Thus your references to "letters" and your use of "has" are incomprehensible. Could you edit this question to provide enough information to understand what you're trying to do?
– whuber
Commented Nov 7, 2013 at 17:20