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Split plot plus control

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Frequent Learner
Posts: 1

Split plot plus control

[ Edited ]

Greetings,

 

I was testing 9 different media for fungus each at 4 different concentrations (1, 2, 3, 4) for their effect on radial growth of fungus. 

                           9 x 4 = 36 combinations each with 3 Replications

 I want to compare how these 36 combinations effect the growth in comparison with control_1 and control_2.

 

Control_1 is = Media '10'

Control_2 is = Media '11'

 

MediaConcRepRadial growth
12511.05
12520.85
12530.8
15010.95
15020.85
15030.9
110011.05
110020.85
110030.85
120011
120021
120031.05
22510.8
22520.7
22530.65
25010.7
25020.65
25030.8
210010.55
210020.7
210030.65
220010.75
220020.65
220030.6
32511.15
32520.95
32531
35011
35021.1
35031.15
310011.25
310020.85
310030.9
320010.95
320020.95
320030.95
52510.95
52520.9
52530.95
55010.9
55021
55030.85
510010.85
510020.9
510030.65
520010.95
520020.6
520030.9
62510.75
62520.55
62530.6
65010.5
65020.5
65030.5
610010.4
610020.45
610030.45
620010.5
620020.5
620030.5
72510.65
72520.6
72530.65
75010.6
75020.5
75030.6
710010.55
710020.6
710030.6
720010.55
720020.6
720030.6
82510.4
82520.6
82530.45
85010.4
85020.4
85030.35
810010.4
810020.4
810030.45
820010.4
820020.5
820030.5
92510.4
92520.4
92530.45
95010.4
95020.4
95030.35
910010.45
910020.45
910030.5
920010.4
920020.45
920030.5
10010.65
10020.65
10030.6
11010.75
11020.6
11030.65

 

I never used contrasts before. Could someone help me with code?

 

Thank you,

Sai

PROC Star
PROC Star
Posts: 188

Re: Split plot plus control

This paper is a good resource for the technical details

https://support.sas.com/resources/papers/proceedings11/351-2011.pdf

 

The challenge will be deciding what you want to compare to what, which is context-specific and thus falls to you, the researcher.

 

If your intent is to compare each of 36 treatment means to each of two control means, then you could consider mean comparisons controlled for Type I error using the Dunnett method, possibly with additional adjustment due to having two controls rather than one.

 

Good luck!

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