not positive definite matrix in SPSS

[Jashan Kheiva]

hello friends,

what could be the possible reasons for a non positive definite matrix? n how to overcome this situation?

kindly help!!

Regards,
Jashandeep Singh
Asst. Prof. (Management)
Rayat-Bahra Group of Institutions, Patiala.
Mob.: +91-987-629-2002

[Neeraj Kaushik]

Dear Jashan

I think u r talking in the context of Factor analysis.

Is it so? If not then plz share the context.

You know when you write ur queries, u r absolutely clear about it, but its helpful to others if complete context is given.

Best wishes
Neeraj

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[Jashan Kheiva]

sorry sir for incomplete query.

yes sir, its regarding factor analysis (using spss).

Regards,
Jashandeep Singh
Asst. Prof. (Management)
Rayat-Bahra Group of Institutions, Patiala.
Mob.: +91-987-629-2002

[Neeraj Kaushik]

The reason for this error is inadequate sample size.

Plz check No of respondents shd be 3 times no. of statements in ur questionnaire (on which u r applying EFA)

[Jashan Kheiva]

Dear sir,
Sample size is 300 n no. Of statements is 52
Still showing not positive definite matrix. I searched on Internet,  it says prob of multicollinearity, i tried dropping a few statements, but not working.
so what to do in that situation?

[Neeraj Kaushik]

Can u share ur spss file so that i may see whats going wrong?

[Jashan Kheiva]

sir,
basically i was doing pilot testing so i copied the 50 responses again in order to make sample size adequate.

SPSS output sheet is attached herewith.

THANK YOU

Regards,
Jashandeep Singh
Asst. Prof. (Management)
Rayat-Bahra Group of Institutions, Patiala.
Mob.: +91-987-629-2002

[Neeraj Kaushik]

hmmm......

whenever u copy the same row again & again, spss never consider it.

Though it never show it in output but it deletes such entries

[Jashan Kheiva]

Alright sir
I give it a try after copying it in excel.

Thank you so much sir

[Neeraj Kaushik]

Dear Jashan
M not asking u to copy it in excel. Rather m saying get more data and
then apply EFA.
Best wishes
Neeraj

[Jashan Kheiva]

Okay air.
Thanks.

[ninnisi...@gmail.com]

HELLO  i am also facing the same issue for a non-positive definite matrix?

will you please tell me how to overcome this situation?

[Neeraj Kaushik]

Dear Ninni

You're getting this problem in AMOS or in SPSS?

Best wishes

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[NINNI SINGH]

Ok

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[NINNI SINGH]

In spss no kmo value is displaying And in amos it is showing error message.

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[Neeraj Kaushik]

Dear Ninni

Can you send the screenshot of the problem in AMOS?

Best wishes

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[sandeep singh]

It mean in your data set there are variables a perfect linear combination of other variables in the dataset.

 
Solution for it

Try to remove one by one items in different combination hope you will get

sandeep

On Sun, Nov 19, 2017 at 5:05 PM, <ninnisi...@gmail.com> wrote:

--

[sandeep singh]

if it's telling you your correlation matrix (i'm assuming it's the correlation matrix on which you want to do factor analysis) isn't positive definite, then it isn't a real correlation matrix. could it be that maybe you added a variable to your dataset that is ? i've seen people have this problem when they include something like the total sumscore of their items alongside of the items themselves

It mean in your data set there are variables a perfect linear combination of other variables in the dataset.

 Solution for it

Try to remove one by one item in different combination

On Sun, Nov 19, 2017 at 5:05 PM, <ninnisi...@gmail.com> wrote:

--

[sandeep singh]

On 11/21/17, NINNI SINGH <ninnisi...@gmail.com> wrote:
> Thank you, sandeep sir and Neeraj sir. I found the parameter that creating
> the problem I have removed that parameter and now my KMO value is 0.747.
> but in Amos, i am getting no standardized RMR value. kindly refer the
> snapshot for more clearance. please suggest me the solution as i am the
> first time performing statistical analysis.
>
> Ninni Singh
> Research Scholar
> Centre for Information Technology, | College of Engineering Studies,
> University Of Petroleum & Energy Studies
> Dehradun, Uttarakhand, India.
> Email-Id- ninni...@ddn.upes.ac.in

>>>> Mob.: +91-987-629-2002 <+91%2098762%2092002>

>>>>
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[NINNI SINGH]

Thank you, sandeep sir and Neeraj sir. I found the parameter that creating the problem I have removed that parameter and now my KMO value is 0.747. but in Amos, i am getting no standardized RMR value. kindly refer the snapshot for more clearance. please suggest me the solution as i am the first time performing statistical analysis.

Ninni Singh 

Research Scholar

Centre for Information Technology, | College of Engineering Studies,
University Of Petroleum & Energy Studies
Dehradun, Uttarakhand, India.

Email-Id- ninni...@ddn.upes.ac.in

On Tue, Nov 21, 2017 at 12:14 AM, sandeep singh <public...@gmail.com> wrote:

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[laila.dia...@gmail.com]

hi everyone,

 

I am also facing the same problem, the non positive definite (Correlation) matrix in SPSS which regarding factor analysis. I have 31 Factors and 28 responses for each. I need the KMO and Bartlet Test output and they depend on the correlation matrix  which now is a non positive matrix. I tried getting KMO for 27 Factors and it worked but I need the KMO and Bartlet for the whole factors.

 

Pleaseeeee kindly help!!

[Neeraj Kaushik]

This problem arises coz of low sample size.
For 31 items there shd be min sample of 150.

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> 3. Its better to give a proper subject to your post/query. It'll help others
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> scholars NOT FOR WORK THEM.
> 5. Never write words like URGENT in ur posts. People will help them when
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------------
Thanks & Regards

Dr Neeraj Kaushik
Associate Professor
Department of Business Administration
NIT Kurukshetra

[laila.dia...@gmail.com]

Thanks alot for your response.
Warm Regards.

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