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05-17-2015 11:24 AM

Dear all,

How are you?

I'd like to ask if it's possible to write out the equation from the proc transreg below?

Can the regression coefficients below be written as y=6.87157+3.65544male+...+0.47702score?

and be interpreted as one unit increase in x will increase y by 0.53355?

Thank you very much.

ods graphics on;

proc transreg data=rtm solve test nomiss plots=all;

model spline(y/ nknots=9)=opscore(male)

opscore(age18_19) opscore(age20_24) opscore(age25_34) opscore(age35_44) opscore(age45_54)

spline(x/ nknots=9) identity(score) / cl detail;

output out=trans predicted residuals mrc coefficients;

run;

ods graphics off;

proc print data=trans; where _TYPE_='M COEFFI'; run;

/*

obs _TYPE_ _NAME_ TIntercept Tmale Tage18_19 Tage20_24 Tage25_34 Tage35_44 Tage45_54 Tx Tscore

1325 M COEFFI y 6.87157 3.65544 6.04942 5.01395 4.95410 5.90719 3.10483 0.53355 0.47702 .

*/

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05-19-2015 06:51 AM

Yes. That is how to read them (I am assuming each of the tage variables are coded 0 and 1).

If you have actual age, I would recommend using that, instead of the categorical variables for age.

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05-20-2015 03:21 AM

Hi Peter.

Thanks for your reply.

I tried what you suggested by fitting spline to the continuous age variable instead.

I later examined the residuals of my spline regression but I'm not sure if the residual plot and the Q-Q plot indicate any severe heteroscedasticity and non-normality?

Perhaps you could shed some light me on this?

Thank you very much.

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05-20-2015 06:13 AM

It does seem to exhibit some of each; whether that will be problematic is another question - I don't know of good tools for figuring out how great a violation relates to how problematic a regresssion

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05-21-2015 09:05 PM

Thanks Peter for your response.

I'll go and explore a bit more.

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06-09-2015 02:05 AM

Hi Peter.

How are you?

Let's not worry about the non-normality and heteroscedasticity for now.

Can I please ask you about my interpretation of the spline regression coefficients in the first post whether it is correct?

Thank you very much and have a good day.

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06-10-2015 07:30 AM

Yes, you're right in your interpretation.