1
As God is my witness, I thought turkeys could
fly. WKRP Station Manager Arthur C. Carlson
(Actor Gordon Jump) ALWAYS check your
assumptions!
2
SUDAAN DESIGN COMMANDS
With Without
Replication Replacement Replacement
Method
WR WOR
Jackknife UNEQWOR
BRR (Fay) STRWR
STRWOR SRS
Adapted from Page 3-3 SUDAAN Manual, Vol. 1
3
DESIGN OPTION FLOWCHART FOR LINEARIZATION METHOD
PSU SELECTION
WITH REPLACEMENT (n / N small, ALL strata)
WITHOUT REPLACEMENT (n / N large, ANY stratum)
NOT CLUSTERED equal prob. W/in strata
CLUSTERED
CLUSTERED
NOT CLUSTERED
STRWOR
WR
STRWR
UNEQWOR UNequal prob. ONLY FIRST stage
WOR equal prob. ALL stages
Adapted from Page 3-7 SUDAAN Manual, Vol. 1
4
DESIGN EFFECT
MEASURES VARIANCE INFLATION FROM
DEFF1
Stratification/Blocking Clustering
Unequal Weighting Oversampling Assumes total
sample size is fixed
Stratification/Blocking Clustering
Unequal Weighting Assumes subgroup sample sizes
are fixed
DEFF2
DEFF3
Stratification/Blocking Clustering Assumes
subgroup sample sizes are fixed
Stratification/Blocking Clustering
Unequal Weighting Model-based SRS variance
(e.g., experiments)
DEFF4 default!
Adapted from Page 3-38 SUDAAN Manual, Vol. 1