I recently re-ran a survey for year to year comparisons. In the recent survey I changed the Likert scale slightly by anchoring each box rather than just # 1 and # 6.
In other words, my scale went from this:
1 - agree completely, 2 , 3 , 4 , 5 , 6 - disagree completely
1 - agree completely 2 - agree 3 - somewhat agree 4 - somewhat disagree 5 - disagree 6 - disagree completely
Will the year to year comparisons still be accurate? I have looked online but have not found any standard best practices in this area. Thanks.