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Dear Ngeners,

Today after I run my design, Ngene gave me this warning: " warning - Defaulting to prior values for zero for the following priors'' ". But it doesn't tell me exactly which prior. Could anyone tell me why please?

Here is my design:

Code: Select all

Design


;alts(view) = alt1, alt2,SQ
;alts(nonview) = alt1, alt2,SQ
;rows = 12
;block=2
;eff = Fish(rp,d)
;fisher(Fish)=des1(view[0.6],nonview[0.4])




;model(view):

U(alt1) =        b2[n,(n,-1,0.05),(u,0.1,0.2)] * DisF[0,2,4] + b3[n,(n,-1.45,0.01),(u,0.2,0.4)] * DisP[0,0.5,1]+ b4[(n,3,1)] *Surf[-0.1,0,0.1] 
+  b5[n,(n,1.1,0.2),(u,0.2,0.3)]  *  view[0,1] + b6[n,(n,-9,1),(u,1,2)] * price[-0.15,-0.1,-0.05,0,0.05,0.1] + i1[(n,-1,0.02)]*DisF*DisP /

U(alt2) =        b2   * DisF    +   b3     *   DisP     +    b4  * Surf      +    b5  *view   +b6*price ++ i1*DisF*DisP   /


U(SQ) = b1[(n,1.34,0.2)]


;model(nonview):

U(alt1) =        b2[n,(n,-1,0.05),(u,0.1,0.2)] * DisF[0,2,4] + b3[n,(n,-1.45,0.01),(u,0.2,0.4)] * DisP[0,0.5,1]+ b4[(n,3,1)] *Surf[-0.1,0,0.1] 
+  b5[n,(n,1.1,0.2),(u,0.2,0.3)]  *  view[0,1] + b6[n,(n,-9,1),(u,1,2)] * price[-0.15,-0.1,-0.05,0,0.05,0.1] + i1[(n,-1,0.02)]*DisF*DisP /

U(alt2) =        b2   * DisF    +   b3     *   DisP     +    b4  * Surf      +    b5  *view   +b6*price ++ i1*DisF*DisP   /


U(SQ) = b1[(n,1.34,0.2)]




$

Thank you.

Problem is solved!

Hi Gengyang TU,

I have also got similar warning sign like you 'Warning: Defaulting to prior values of zero for the following priors: '0''

Would you be so kind to let me know how did you solve the problem?

Here is my Syntax, if it helps:
Design
;alts = TF1, TF2,optout
;rows = 36
;eff = (mnl,d,fixed)
;block= 9

;model:
U(TF1) = 0.0914+b1[-0.0454]*PP[39, 49, 59] + b2[-0.287]*PTT20 [0,1]+ b3[0.043]* PTT40[0,1]+ b4[0.153]*PTTUN[0,1] + b5[0.11]*ED10[0,1]+ b6[0.178]*ED20[0,1]+ b7[0.196]*ED30[0,1] + b8[0.0769]*EFT30[0,1]+ b9[0.168]*EFT60[0,1]+ b10[-0.177]*BP25[0,1] + b11[-0.101]*BP50[ 0,1]+ b12[-0.0152]*BP75[0,1] + b13[0.1]*BFT10 [0,1]+ b14[0.212]*BFT20[0,1]+ b15[0.221]*BFT30[0,1]/
U(TF2) = 0.0914+b1*PP + b2*PTT20+ b3*PTT40+ b4*PTTUN + b5*ED10 + b6*ED20 + b7*ED30 + b8*EFT30+ b9*EFT60 + b10*BP25+ b11*BP50+ b12*BP75 + b13*BFT10+ b14*BFT20+ b15*BFT30/
U(optout)=b1*PPO[39]
$

Thanking you in advance,
Rumana

Dear Rumana,

This warning always appears in Ngene when one or more parameters do not have an associated prior.
In your case, you did not formulate your alternative-specific constants properly, you forgot to give your constant value 0.0914 a parameter name. I added parameter b0 in the utility functions below, which now has a prior equal to 0.0914.

U(TF1) = b0[0.0914]+b1[-0.0454]*PP[39, 49, 59] + ... /
U(TF2) = b0+b1*PP + ... /
U(optout)=b1*PPO[39]

Michiel

Dear Michiel,

I ran the syntax with the changes that you've suggested and I didn't get any warning.

Thank you very much for your help. I really appreciate it.

Best Regards,
Rumana