I've done some sums on SPSS and I have this as a p-value: -3.403E38
Can I presume that that is a very, very small p-value below p= 0.01
I just want to make sure I've got it right. Thanks.
hmmm, I would have thought it's actually a really high number, but now I'm not so sure....
If for example 1.5E5 = 150000, then your -3.403E38 should = -340300000000...
I have been doing SPSS all day myself however, so my brain is frying as I type so I could be very wrong!
That's precisely the output for the P-value I got. Thinking about it, it has to be the power of minus 10 to the power of 38 because you can't get a p-value of above 1.0 I don't think. I really hope I haven't done it wrong now, but most of the others look fine.
lol that would make more sense Wally! :) Good catch DanB, I was seriously getting worried about myself there!
I know why I was getting a negative p-value now. I used the wrong test. It's not my fault though; it was SPSS offering me all these fancy additional tests as an add on to the original stats test I was running. For paired ordinal test-retest data, my good friend Wilcoxon has shown my the way. I've now got p-values that look more normal. None of that minus p-value to infinity and beyond business.
Tell me about it, I'm currently battling my way through version 17! We are forced to upgrade every time at our uni. Consequently I have turned to Simca P+ for PCAs (they scare me in SPSS) and even braved R for CA and CCA! I have a serious new found respect for R, if I don;t get a job when I'm finished and have about 3 months with nothing to do, I'm going to sit and properly learn it... :p
I quite like SPSS. Mainly cos i've never used anything else so don't know what I'm missing! Hate the weird bugs it gets. Thinking of upgrading from15....is 17 much different? Never seen a negative p value though!
Everyone I know who uses r raves about it, esapecially it's ability to draw better graphs, but don't you need programming skills? I'm sadly laking any of these!
PostgraduateForum Is a trading name of FindAUniversity Ltd
FindAUniversity Ltd, 77 Sidney St, Sheffield, S1 4RG, UK. Tel +44 (0) 114 268 4940 Fax: +44 (0) 114 268 5766
An active and supportive community.
Support and advice from your peers.
Your postgraduate questions answered.
Use your experience to help others.
Enter your email address below to get started with your forum account
Enter your username below to login to your account
An email has been sent to your email account along with instructions on how to reset your password. If you do not recieve your email, or have any futher problems accessing your account, then please contact our customer support.
or continue as guest
To ensure all features on our website work properly, your computer, tablet or mobile needs to accept cookies. Our cookies don’t store your personal information, but provide us with anonymous information about use of the website and help us recognise you so we can offer you services more relevant to you. For more information please read our privacy policy
Agree Agree