CHI SQUARE TEST

Hi,
I have a data of patients on which i have to apply Chi square test.
The data is in the following format:-

S NO. NO. OF DAYS ON INCIDENCE OF
PATIENT IS ON VENTILATION INFECTION
1. 9 INFECTED
2. 11 INFECTED
3. 4 NOT INFECTED
4. 8 INFECTED
5. 6 NOT INFECTED
6. 13 INFECTED
7. 12 INFECTED
8. 4 NOT INFECTED

The probability is higher in case of patient being on ventilation for a
longer period of time.
I want to apply Chi square test on the above data.If some body
can help me out.
Thanks in advance

Regards
Rajeev

Check out the following from U Mass:

http://www-unix.oit.umass.edu/~evagold/excel.html

It gives an example of thorough data analysis on a small sample of data
--
Gary's Student


"rajeev" wrote:

> Hi,
> I have a data of patients on which i have to apply Chi square test.
> The data is in the following format:-
>
> S NO. NO. OF DAYS ON INCIDENCE OF
> PATIENT IS ON VENTILATION INFECTION
> 1. 9 INFECTED
> 2. 11 INFECTED
> 3. 4 NOT INFECTED
> 4. 8 INFECTED
> 5. 6 NOT INFECTED
> 6. 13 INFECTED
> 7. 12 INFECTED
> 8. 4 NOT INFECTED
>
> The probability is higher in case of patient being on ventilation for a
> longer period of time.
> I want to apply Chi square test on the above data.If some body
> can help me out.
> Thanks in advance
>
> Regards
> Rajeev
>
>

Check out the following from U Mass:

http://www-unix.oit.umass.edu/~evagold/excel.html

It gives an example of thorough data analysis on a small sample of data
--
Gary's Student


"rajeev" wrote:

> Hi,
> I have a data of patients on which i have to apply Chi square test.
> The data is in the following format:-
>
> S NO. NO. OF DAYS ON INCIDENCE OF
> PATIENT IS ON VENTILATION INFECTION
> 1. 9 INFECTED
> 2. 11 INFECTED
> 3. 4 NOT INFECTED
> 4. 8 INFECTED
> 5. 6 NOT INFECTED
> 6. 13 INFECTED
> 7. 12 INFECTED
> 8. 4 NOT INFECTED
>
> The probability is higher in case of patient being on ventilation for a
> longer period of time.
> I want to apply Chi square test on the above data.If some body
> can help me out.
> Thanks in advance
>
> Regards
> Rajeev
>
>

If you are trying to test whether infection rate is independent of time
on ventilation, one way would be to set this up as a 2x2 contigency table
infected not infected
shorter ventilation 3 0
longer ventilation 0 5

You could then do either a chi-square (approximate) analysis of the
contingency table, or do Fisher's exact test.

Jerry

rajeev wrote:

> Hi,
> I have a data of patients on which i have to apply Chi square test.
> The data is in the following format:-
>
> S NO. NO. OF DAYS ON INCIDENCE OF
> PATIENT IS ON VENTILATION INFECTION
> 1. 9 INFECTED
> 2. 11 INFECTED
> 3. 4 NOT INFECTED
> 4. 8 INFECTED
> 5. 6 NOT INFECTED
> 6. 13 INFECTED
> 7. 12 INFECTED
> 8. 4 NOT INFECTED
>
> The probability is higher in case of patient being on ventilation for a
> longer period of time.
> I want to apply Chi square test on the above data.If some body
> can help me out.
> Thanks in advance
>
> Regards
> Rajeev

If you are trying to test whether infection rate is independent of time
on ventilation, one way would be to set this up as a 2x2 contigency table
infected not infected
shorter ventilation 3 0
longer ventilation 0 5

You could then do either a chi-square (approximate) analysis of the
contingency table, or do Fisher's exact test.

Jerry

rajeev wrote:

> Hi,
> I have a data of patients on which i have to apply Chi square test.
> The data is in the following format:-
>
> S NO. NO. OF DAYS ON INCIDENCE OF
> PATIENT IS ON VENTILATION INFECTION
> 1. 9 INFECTED
> 2. 11 INFECTED
> 3. 4 NOT INFECTED
> 4. 8 INFECTED
> 5. 6 NOT INFECTED
> 6. 13 INFECTED
> 7. 12 INFECTED
> 8. 4 NOT INFECTED
>
> The probability is higher in case of patient being on ventilation for a
> longer period of time.
> I want to apply Chi square test on the above data.If some body
> can help me out.
> Thanks in advance
>
> Regards
> Rajeev

Check out the following from U Mass:

http://www-unix.oit.umass.edu/~evagold/excel.html

It gives an example of thorough data analysis on a small sample of data
--
Gary's Student


"rajeev" wrote:

> Hi,
> I have a data of patients on which i have to apply Chi square test.
> The data is in the following format:-
>
> S NO. NO. OF DAYS ON INCIDENCE OF
> PATIENT IS ON VENTILATION INFECTION
> 1. 9 INFECTED
> 2. 11 INFECTED
> 3. 4 NOT INFECTED
> 4. 8 INFECTED
> 5. 6 NOT INFECTED
> 6. 13 INFECTED
> 7. 12 INFECTED
> 8. 4 NOT INFECTED
>
> The probability is higher in case of patient being on ventilation for a
> longer period of time.
> I want to apply Chi square test on the above data.If some body
> can help me out.
> Thanks in advance
>
> Regards
> Rajeev
>
>

If you are trying to test whether infection rate is independent of time
on ventilation, one way would be to set this up as a 2x2 contigency table
infected not infected
shorter ventilation 3 0
longer ventilation 0 5

You could then do either a chi-square (approximate) analysis of the
contingency table, or do Fisher's exact test.

Jerry

rajeev wrote:

> Hi,
> I have a data of patients on which i have to apply Chi square test.
> The data is in the following format:-
>
> S NO. NO. OF DAYS ON INCIDENCE OF
> PATIENT IS ON VENTILATION INFECTION
> 1. 9 INFECTED
> 2. 11 INFECTED
> 3. 4 NOT INFECTED
> 4. 8 INFECTED
> 5. 6 NOT INFECTED
> 6. 13 INFECTED
> 7. 12 INFECTED
> 8. 4 NOT INFECTED
>
> The probability is higher in case of patient being on ventilation for a
> longer period of time.
> I want to apply Chi square test on the above data.If some body
> can help me out.
> Thanks in advance
>
> Regards
> Rajeev