Programming the statistical procedures from SAS

output proc NLMIXED

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Contributor L_L
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Posts: 56

output proc NLMIXED

Dear all

I'm using proc nlmixed.

Y= number of nurses in emergency surgery

X1=number of critical patients

X2=number of unstable patients

X3=number of stable patients

u= hospital effect

Here after the code

proc nlmixed data=fine;

     PARMS b0=0 b1=0 b2=0 b3=0;

     mu=exp(b0+b1*x1+b2*x2+b3*x3+u);

     p=exp(-mu)*mu**y/fact(y); 

     ll=log(p);

     var_u=exp(2*logsd_u);

     MODEL y ~ general(ll);

     random u ~ normal(0,var_u) subject=invsite;

run;

and the output

Parameter Estimates

Parm

Estimate

Standard error

DF

t Value

Pr > |t|

Alfa

Lower

Upper

b0

0.7115

0.1842

32

4.41

0.0001

0.05

0.4364

1.1866

b1

0.1378

0.05253

32

2.05

0.0484

0.05

0.000803

0.2148

b2

0.1109

0.04460

32

2.71

0.0107

0.05

0.03003

0.2117

b3

0.06161

0.02206

32

1.89

0.0684

0.05

-0.00333

0.08654

logsd_u

-8.4224

592.73

32

-0.02

0.9874

0.05

-1216.78

1197.94


Could anyone help me in understanding then parameter estimates? What's the meaning?

Thank in advance for any help

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