I have two data sets from the same questionnaire run over two years. Each question is measured using a 5-Likert scale.
Q1: Coding scheme
At the moment, I have coded my responses on a [0, 1] interval, with 0 meaning "most negative response", 1 meaning "most positive response", and other responses spaced evenly between.
- What is the "best" coding scheme to use for the Likert scale?
I realise that this might be a bit subjective.
Q2: Significance across years
- What is the best way to determine whether there is statistically significant change across the two years?
That is, looking at the results for question 1 for each year, how do I tell if the difference between the 2011 result and the 2010 result is statistically significant? I've got a vague recollection of the Student's t-test being of use here, but I'm not sure.