## Thursday 17 October 2013

### Paired Student's t test Calculator

The Paired Student's t-test is a parametric test that determines whether two groups of matched (i.e. dependent) samples are the same. It thus requires that the two groups have the same number of samples. For example, we could have the blood pressure readings for a group of patients before a certain medication is applied, and then the corresponding blood pressure readings for the same group of patients a few months after treatment. If there are \$N\$ readings, samples 1 of the two datasets will be the reading from Patient 1 before and after treatment, samples 2 will be the readings from Patient 2 before and after treatment, and so on. A worked example of carrying out the Paired Student's t-test can be found here

Below is an online calculator that implements the Paired Student's t-test. Please enter Group 1 and Group 2 values as comma separated numbers in the fields below. Group 1 and Group 2 must have the same number of samples. Alternatively, you can choose a two-column CSV file to load - simply press on the choose file button below the clear Group 1 and Group 2 buttons. To reload the same file after clearing the text areas, you would need to reload this webpage.

At the bottom there is a graph that will display the histograms of both the groups and their difference. This conveys a lot of useful information visually. As we assume that all the data are distributed Normally, the spread of the histograms will be proportional to the variance of the samples within the groups, and the centre of the histograms will coincide with the means of the samples in the groups. The greater the mean of the group differences, and the lower the variance of the differences, the higher the calculated t value will be, leading to a lower p-value, possibly yielding a significant result. The histogram of the differences is key to seeing this - for a low p-value, it will be very narrow, and will be centred on a noticeably large value of the mean. As for the two groups' histograms, they will be widely spaced apart, with very similar spreads, indicating a systematic difference.

 Group 1 values: Group 2 values:

Results pending...

 Histograms of the two groups Frequency Values
 Histogram of differences Frequency Values

1. Hi friends!
I am Lucy Donald by name and i want to use this great opportunity to share with you some great and amazing testimony of how i was cured from HERPES Virus with the help of Dr Ehimare Herbal Medicine.
Over 2 years now i have been suffering and living in pain with this deadly virus Herpes, fear grew in my mind everyday as i heard there is no cure for it, but to me i knew that medical drugs was not the only option in treating viruses and infection, my greatest problem was that i was stocked in pain as the symptoms has circulated over my body.
Few Months ago i decided to get more information online concerning herpes,and while i was surfing the web, i came across some great testimonials from various people on how Dr Ehimare has been using his herbal medicine to cure different disease, at first i was shocked as i have never heard of such thing before, and also i doubted if it was true as it never came up on media, these people gave out the email address of Dr Ehimare and advised we contact him for any problem, though i was doubting him i decided to put a test on it, moreover it was the fist time for me to hear something like that, i copied the email address of Dr Ehimare and i sent him a message about my health status and i also requested for his medicine in order for me to get good health, he gave me a responded after some hours and he told me the procedure involved in order for me to get his medicine, he also said to me he was going to send me some herbal liquid medicine which was gactually went to the hospital on Friday to do some test on my blood and after 3 days the result came out that i was completely free from HERPES, still many people will not believe this, but it did really works.
Dr Ehimare is a brave man and he is set to answer all human disease, today i am living in good health as just with a test i conquered my pain and sorrow, Please you can contact Dr Ehimare for any problem with the email below: drehimare3@gmail.com or whatsapp on +1 (267) 691-1087

2. THERE IS CURE FOR HERPES VIRUS. This has been a great opportunity for me to speak about Doctor Ishiaku concerning his HERBAL MEDICINE for the cure of HERPES VIRUS. I am a living proof of the cure, it is not a story any more, thank God i gave him a try to cure me, i was confirm 100% negative after the usage of the herbal medicine, it is like a dream to me that Doctor Ishiaku herbal medicine could cure herpes virus to 100% negative, before i proceed further let me quickly share his contact to the general public so anyone suffering from this virus can also have an opportunity like this to be cured. ( what - sapp + 2348180828544) or (email: ishiakuherbalcure@yahoo.com) .Please let every Herpes patient give herbal medicine a try. It works perfectly well. don't be deceived any more that there is no cure. This herbal medicine was shipped from Africa to me here in the United State by DHL. I am so happy to have seen my health and life back to normal. Thank you Doctor Ishiaku

3. Have you been suffering from any kind of disease, and you want to be free from it. Then contact, Dr. Joseph Olorungbebe. On his WhatsApp: +2347026909147 Or email: drjosepholorungbebe@gmail.com

### Logistic Regression Calculator and ROC Curve Plotter

This blog post implements a Logistic Regression calculator for a binary output. Consider a binary outcome response variable \(Y\...