When I tried to measure online fresh food shopping customer experience, I collected my data from consumers who have shopped "within the past three months", does anyone know any work that can support this "three months" time constrain? I set this time frame based on the discussions with consumers and supervisors but is there any work that can support this "three-month" constrain is reasonable?
Not to be discouraging, but recall of grocery purchases or experiences in the last three months -- well, how much of your own shopping from mid March do you remember? For shopping, if accuracy is paramount, a diary or receipt-based approach is often needed, or scanner data, of course. Or, a more recent interval like in the last week. If this is about Web sites, what they bought may be readily available to them from receipts and confirmations, but the experiential aspects subject to a fading memory, if we are talking about anything past the most recent purchase.
