variance related warning message in path analysis

[Fülöp Attila]

Dear lavaan users,

I have a path analysis which runs OK, but gives the following warning message:

"Warning message:

In getDataFull(data = data, group = group, group.label = group.label,  :

  lavaan WARNING: some observed variances are (at least) a factor 1000 times larger than others; please rescale"

Why is this message generated? Is this a problem or can I just ignore this message?

Thank you in advance!

Attila

 

[Edward Rigdon]

Surprising things happen in SEM when observed variables differ substantially in scale.  the warning is giving you good advice.  You can easily rescale by, for example, dividing your larger-scale variables by some power of 10.  Diving the variable by 10 divides its variance by 100.

--Ed Rigdon

Sent from my iPad

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[yrosseel]

On 09/28/2013 05:23 PM, F�l�p Attila wrote:
> Dear lavaan users,
>
> I have a path analysis which runs OK, but gives the following warning
> message:
>
> "Warning message:
> In getDataFull(data = data, group = group, group.label = group.label, :
> lavaan WARNING: some observed variances are (at least) a factor 1000
> times larger than others; please rescale"

99% of the time, this warning is completely harmless; but you should
still check your data, eg by typing:

varTable(fit)

to identify the variables with (very) large variances. Rescale the
variable(s), and fit again.

Yves.

[Fülöp Attila]

Dear Edward and Yves,

Thank you for your answers. I had one variable with very high variance. I rescaled it and performed the analyses again. As you predicted Yves, nothing has changed within the results, but the warning message disappeared. 

Thank you again for your help!

Attila

2013. szeptember 28., szombat 19:18:37 UTC+2 időpontban Yves Rosseel a következőt írta: