Repeated Measure Analysis

fridge — Wed, 09 Dec 2015 04:37:10 GMT

Hi All,

I have data of an experiment on which I started working on for my own learning. The objective of the experiment is to investigate the effect of row spacing on grain moisture content that was measured in a 2x2 factorial (four replications) where each treatment (variety and row spacing) was measured weekly for grain moisture content till harvest.

I think the data/exp fits for repeated measure analysis? Following is the model:

options linesize=78;
Data moisture;
Input variety$ row_spac Block Week_1 to Week_10;
datalines;

Variety	Row_Spac	Block	Week_1	Week_2	Week_3	Week_4	Week_5	Week_6	Week_7	Week_8	Week_9	Week_10
Variety_A	30	1	68.33	65.08	58.42	54.42	51.25	44.92	40.08	31.50	26.25	17.56
Variety_A	60	1	67.58	65.33	61.08	58.58	55.83	52.50	46.75	39.42	27.17	18.10
Variety_A	22	1	69.08	65.50	59.33	55.08	51.17	45.92	38.67	33.33	29.00	17.00
Variety_A	15	1	71.50	67.33	64.25	60.50	52.42	42.75	39.92	35.17	29.58	16.89
Variety_B	30	1	67.00	62.67	58.67	54.83	53.17	46.83	39.58	31.67	26.83	19.30
Variety_B	60	1	64.67	61.17	58.58	54.67	55.00	50.92	43.00	34.92	32.42	19.20
Variety_B	22	1	67.42	62.17	59.67	55.25	51.17	44.50	38.58	34.25	27.83	17.60
Variety_B	15	1	66.83	67.25	63.00	62.67	51.08	47.25	38.25	31.67	29.50	18.90
Variety_A	15	2
Variety_A	22	2

proc glm data=moisture;

class variety row_spac;
model Week_1 to Week_10 = row_spac|variety;
repeated time 10;
lsmeans row_spac variety;
run;

Please, suggest/comment advise on the sas model. I have tried running this model with some modifications but I do not get correct df (320-1). I must be making a mistake that I do not realize.Thank you.

Re: Repeated Measure Analysis

cici0017 — Thu, 31 Mar 2016 14:54:41 GMT

Rpeated measures is suggested to use PROC MIXED procedure, see the example in the documentation-

http://support.sas.com/documentation/cdl/en/statug/68162/HTML/default/viewer.htm#statug_mixed_examples02.htm

topic Re: Repeated Measure Analysis in SAS Programming

Repeated Measure Analysis

Re: Repeated Measure Analysis