One way random effects model - Hausman test yields no m values in some cases

[shenflow]

I am estimating the following:

proc panel data = data;
	id gvkey rankyear;
	model y = cera_pl_vol cera_mi_vol revi_pl_vol revi_mi_vol 
		 				/ranone noint hccme = 3 cluster;
run;
quit;

 I want to check the Hausman-Statistic to infer wether random effects are appropriate or not. I estimate this for a set of different panels.

In some cases I get a m-value. In some cases I do not get a m-value. Why is that so? How can I appropriately check wether random effects are appropriate (random effects for gvkey)?

Examples are attached below:

[SASCom1]

What is the specific SAS release you are running? You can find the exact SAS release information by submitting the following code and look in the log file:

%put Release: &sysvlong ;

Do you see any warning message in the log file indicating Hausman test is not computed? If so, what is the warning message?