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SIMPLE AND COMPLEX RANDOM ASSIGNMENT IN EXPERIMENTAL DESIGNS |
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Valentim Rodrigues Alferes, University of Coimbra (Portugal), 2009 |
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All the
programs are self-contained SPSS syntax files running automatically from the
SPSS Syntax Editor:
See Output |
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USER SPECIFICATIONS |
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Simple Random Assignment |
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SimpleRand1.sps – Equal probabilities |
• Number of treatments •
Number of units per study |
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SimpleRand2.sps – Forced equal sizes |
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SimpleRand3.sps – Forced unequal sizes |
• Number of treatments • Number of units per treatment |
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SimpleRand4.sps – Unequal probabilities |
• Number of treatments • Theoretical probabilities of assignment • Number of units per study |
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Block Random Assignment |
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BlockRand.sps –
Simple and generalized block designs |
• Number of treatments • Number of blocks • Number of units per block [The number of units per
block must be equal (simple blocks) or multiple (generalized blocks) of the
number of treatments] |
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Stratified Random Assignment |
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StrataRand1.sps – No restrictions |
• Number of treatments • Number of strata • Number of units per stratum [The number of units per
stratum must be equal or greater than the number of treatments] |
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StrataRand2.sps – Forced equal sizes |
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StrataRand3.sps – Forced unequal sizes |
• Number of treatments • Number of strata • Number of units per treatment within
stratum [The number of units per
stratum must be equal or greater than the number of treatments] |
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StrataRand4.sps – Unequal probabilities |
• Number of treatments • Number of strata • Number of units per stratum • Theoretical probabilities of assignment • Number of units per study [The number of units per stratum must be
equal or greater than the number of treatments] |
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WITHIN-SUBJECTS
DESIGNS (Repeated Measures Designs) |
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Complete Counterbalancing |
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CC2.sps – 2 treatments (2 sequences) |
• Number of
units per sequence |
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CC3.sps – 3 treatments (6 sequences) |
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CC4.sps – 4 treatments (24 sequences) |
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CC5.sps – 5 treatments (120 sequences) |
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CC6.sps – 6 treatments (720 sequences) |
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Partial Counterbalancing
(Latin Squares) |
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LS2.sps – 2 treatments (2 sequences) Identical to CC2 (n per sequence = 1) |
No user specifications. The programs produce
automatically a random |
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LS3.sps – 3 treatments (3 sequences) |
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LS4.sps – 4 treatments (4 sequences) |
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LS5.sps – 5 treatments (5 sequences) |
The user must read in the Output Window the
last random permutation produced in
STEP 1 and introduce this permutation in the corresponding syntax line of
STEP 2. |
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LS6.sps – 6 treatments (6 sequences) |
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LS7.sps – 7 treatments (7 sequences) |
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LS8.sps – 8 treatments (8 sequences) |
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LS9.sps – 9 treatments (9 sequences) |
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LS10.sps – 10 treatments (10 sequences) |
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LS11.sps – 11 treatments (11 sequences) |
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LS12.sps – 12 treatments (12 sequences) |
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Carryover Designs
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CO2.sps – 2
treatments /2 sequences (Single carryover design) Identical to CC2 (n per sequence = 1) and LS2 |
No user specifications. The programs produce automatically
a random Carryover Design. |
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CO3.sps – 3
treatments /6 sequences (Double carryover design) Identical to CC3 (n per sequence = 1) |
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CO4.sps – 4 treatments
/4 sequences (Single carryover design) |
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CO5.sps – 5
treatments /10 sequences (Double carryover design) |
The user must read in the Output Window the
last random permutation produced in
STEP 1 and introduce this permutation in the corresponding syntax line of
STEP 2. |
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CO6.sps – 6
treatments /6 sequences (Single carryover design) |
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CO7.sps – 7
treatments /14 sequences (Double carryover design) |
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CO8.sps – 8
treatments /8 sequences (Single carryover design) |
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CO9.sps – 9
treatments /18 sequences (Double carryover design) |
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CO10.sps – 10
treatments /10 sequences (Single carryover design) |
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CO11.sps – 11
treatments /22 sequences (Double carryover design) |
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CO12.sps – 12
treatments /12 sequences (Single carryover design) |
Truncated Counterbalancing and
Random Ordering of Treatments
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The user must add the following syntax line N of cases ?. to CC, LQ, or CO designs. |
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IndRO.sps – Random
Ordering of Treatments |
• Number of treatments • Number of units per study |
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