Hello to you all. I would be very happy if anyone would mind helping me with a little problem I have encountered whilst doing some research.
I am looking at my local hospitals MRI scanner (machine for taking fancy picutures). My first sample is with the new scanner. My second sample is with the old scanner.
The results are being compared with arthroscopy (keyhole surgery) which is the gold standard. I want to compare both samples which are independent to see whether the new scanner is actually any better.
In sample one the raw data and calculated sensitivity was
ACL Arth +ve Arth -ve Sensitivity 100%
MRI +ve 12 6
MRI -ve 0 46
In sample two the raw data was
ACL Arth +ve Arth -ve Sensitvity 85.71%
MRI +ve 24 23
MRI -ve 4 105
I have been told by the local biostatistician to use Chi-square tables but he has gone on holiday and did not tell me which figures I should be putting in to which box on the 2x2 table.
Can someone please help as I am STUCK???? Greatly appreciated and thank-you for your time and effort.
I am looking at my local hospitals MRI scanner (machine for taking fancy picutures). My first sample is with the new scanner. My second sample is with the old scanner.
The results are being compared with arthroscopy (keyhole surgery) which is the gold standard. I want to compare both samples which are independent to see whether the new scanner is actually any better.
In sample one the raw data and calculated sensitivity was
ACL Arth +ve Arth -ve Sensitivity 100%
MRI +ve 12 6
MRI -ve 0 46
In sample two the raw data was
ACL Arth +ve Arth -ve Sensitvity 85.71%
MRI +ve 24 23
MRI -ve 4 105
I have been told by the local biostatistician to use Chi-square tables but he has gone on holiday and did not tell me which figures I should be putting in to which box on the 2x2 table.
Can someone please help as I am STUCK???? Greatly appreciated and thank-you for your time and effort.