Re: Running MIXED with time as a factor

Posted by Maguin, Eugene on Jun 07, 2012; 2:49pm
URL: http://spssx-discussion.165.s1.nabble.com/Running-MIXED-with-time-as-a-factor-tp5713561p5713564.html

Kine,
You have a complex analysis in that it has one factor and lots of covariates and interactions among covariates and with the factor plus a random intercept and time effects. But you have duplicated terms (see below). In the common meaning of 'three way interaction', you can't have one because you have one factor, time. Yes, you interactions involving time and two covariates but covariates are typically thought of as control variables and in the EMMEANS statements that Bruce just referred to you'll specify that you want the means of the DV at the levels of the time factor with the covariates fixed at specific points. You say ' ... get the parameter estimation on ALL the categories (time 1, time 2, time 3) in my three-way interaction analysis. ... SPSS only estimates time 1 and 2 (as it often does with categorical data). Is it possible that missing data on covariates and DV eliminate all the time=3 cases?

fixed = Gender
Age
Sector
Respons
Tenure
Hour_w
OPce
time
OPce*time
OPce*POSce
OPce*PsSce
OPce*PcSce
PoSce
pssce
pcsce
pssce*time
pcsce*time
Posce*time
POSce*OPce*time
PsSce*OPce*time
PcSce*OPce*time

Gene Maguin


-----Original Message-----
From: SPSSX(r) Discussion [mailto:[hidden email]] On Behalf Of kine
Sent: Thursday, June 07, 2012 10:00 AM
To: [hidden email]
Subject: Running MIXED with time as a factor

Dear subscribers,

I would like to get the parameter estimation on ALL the categories (time 1, time 2, time 3) in my three-way interaction analysis. As of now, SPSS only estimates time 1 and 2 (as it often does with categorical data).

How may I obtain this information? Please find present syntax below:

mixed Exlog with OPce Posce pssce pcsce Gender Age Sector Respons Tenure Hour_w BY time /CRITERIA=MXITER (5000) /print=solution
  /method=reml
  /fixed = Gender Age Sector Respons Tenure Hour_w OPce time OPce*time OPce*POSce OPce*PsSce OPce*PcSce PoSce pssce pcsce pssce*time pcsce*time Posce*time POSce*OPce*time PsSce*OPce*time PcSce*OPce*time
  /random intercept time | subject(id) covtype(VC).

Best regards,
Kine

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