i want to ask why my output of standard error is zero. here my command that i used
data MP02;
input N LAI SPAD HEIGHT DIAMETER BLUE GREEN RED NIR;
cards;
;
proc reg;
FORWARDSELECT:model N= LAI SPAD HEIGHT DIAMETER BLUE GREEN RED NIR/SELECTION=FORWARD;
proc reg;
MAXR:model N= LAI SPAD HEIGHT DIAMETER BLUE GREEN RED NIR/SELECTION=MAXR;
proc reg;
MINR:model N= LAI SPAD HEIGHT DIAMETER BLUE GREEN RED NIR/SELECTION=MINR;
proc reg;
RSQUARE:model N= LAI SPAD HEIGHT DIAMETER BLUE GREEN RED NIR/SELECTION=RSQUARE;
proc reg;
ADJRSQ:model N= LAI SPAD HEIGHT BLUE GREEN RED NIR/SELECTION=ADJRSQ;
PROC PLOT; PLOT N*LAI N*SPAD N*HEIGHT N*DIAMETER N*BLUE N*GREEN N*RED N*NIR;
run;
is there anyone that can suggest what i should do?
You have 9 observations and 8 variables in your actual data?
i averaged according rep
i have three trt, three rep.. in each rep i take 8 plants and averaged for each data
Ok...I think you should use a different analysis method if you have replicated measures, but that isn't the question you asked.
That being said, its your full model - where you have all 8 variables included- that is causing the issues. Given the DF=8 its not surprising. A intro stats text can probably explain it better, I'm rusty with the exact calculations.
proc reg data=mp02;
FULL:model N= LAI SPAD HEIGHT DIAMETER BLUE GREEN RED NIR;
run;
the standard error still 0. is the problems is due to my data? how i can do the regression in correct way?
You don't have enough data to generate standard errors.
I don't know what your actual data looks like so hard to say. Start a new thread with sample data if you'd like. Best to post these types of question in the Statistical Forum as well
thanks reeza
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