I am new to analyzing survey data so would very much appreciate some help!   I'm working with survey data (SAS 9.4) that is in three different SAS data sets. The data sets are from when the survey was administered in 2012, 2015, and 2018 to different schools. One of the schools wants to look at trends in the data for students at their school for certain questions. I want to know how to calculate whether the change in responses to these questions are statistically significant from year to year. For example, I have one question (the variable is q43) that has four different response options: 1=Strongly agree 2=Agree 3=Disagree 4=Strongly disagree   To get the freq table for one year my code looks like this:   proc surveyfreq data=2015dataset; tables q43 / row cl cv; where District=15; weight Weight; run;   How can I calculate whether the change in response to this question differs significantly by year? Also, the data sets are weighted, but every student took the survey at this particular high school so they all have a weight of 1. ... View more