adjustments were made for the missing data by taking the responses other gave for interaction with the student during the time period frequency estimates were converted to numerical estimates of communication per month daily communication was scored as 20 daily to weekly as 12 weekly as 4 weekly to monthly as 2.5 and monthly as 1 total frequency of interaction for a relation for each time period was taken as the sum of the frequencies of interaction via each medium and totals across the term as the sum of the frequencies of interaction at each time period