Cellphone sample weight has smaller design effect than full sample weight Approximate survey designeffects fover time
Between 2012 and 2015, the average approximate design effect of the experimental weight using just the cellphone sample was 1.22, which compares with an average of 1.32 using the actual survey weight based on both the landline and cellphone samples.
Cellphone sample weight has smaller design effect  | than full sample weight  | Approximate survey designeffects fover time  | 1.5  | 1.4  | FULL SAMPLE  | 1.3  | 1.2  | CELLPHONESAMPLE  | 1.1  | 10  | 2012  | 2013  | 2014  | 2015  | Source Surveys conducted April 2012.September2015.  | "The Twilightof Landline Interviewing  | PEW RESEARCH CENTER 