In a scenario where a pot experiment was carried out to evaluate the effect of sulfur on corn.

The experiment was a factorial design with 2 levels of sulfur type and 3 Sulfur rates with 8 replications arranged in a RCBD. Corn heights were measured every week for ten weeks (which is the time in the data below). The subset of the data is shown below:

Pot Trt Block Stype Srate Time Height

101 1 1 SA 0 1 23.0

102 2 1 SA 10 1 21.0

103 6 1 SB 20 1 34.0

104 4 1 SB 0 1 23.0

105 5 1 SB 10 1 25.0

106 3 1 SA 20 1 23.0

To find the effect of sulfur types and rates on corn height, we entered the code below into SAS.

•PROC MIXED DATA=Corn;

• CLASS Block Srate Stype time;

• MODEL Height = Srate|Stype|time/ddfm=kr;

• Random Block;

• REPEATED time / SUBJECT=?

• TYPE=CS;

• lsmeans Srate/adjust=tukey ;

• lsmeans Stype/adjust=tukey;

The question is what should be the subject in this study or what should we enter as the subject in the code?

I look forward to your contributions.

Thank you all