Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

From |
"Carlo Lazzaro" <[email protected]> |

To |
<[email protected]> |

Subject |
st: R: re. information |

Date |
Thu, 21 Nov 2013 11:44:45 +0100 |

```
Dear Panos:
- the first one-way p-value Pr(T < t) = 0.0000 says that, provided that the
null hypothesis is true (the null hypothesis you test is that population
mean is = 423), repeating a virtually endless number of times the same
experiment using new data each time, with a sample of the same size, the
probability of obtaining a value for the mean < 423 is negligible (0.0000).
Hence the null hypothesis is rejected at 0.05;
- the second one-way p-value Pr(T > t) = 1.0000 is simply the difference
between 1 and the first one-way p-value (ie, 1-0.0000=1). Hence the null
hypothesis is not rejected at 0.05;
- the two-way p-value Pr(|T| > |t|)= 0.0001 says that, provided that the
null hypothesis was true (the null hypothesis you tested is that population
mean is = 423), repeating a virtually endless number of times the same
experiment using new data each time, with a sample of the same size, the
probability of obtaining a value for the mean = 423 is negligible (0.0001).
Hence the null hypothesis is rejected at 0.05.
Hence, the big deal is what you are making hypothesis test for.
Kind regards,
Carlo
-----Messaggio originale-----
Da: [email protected]
[mailto:[email protected]] Per conto di PAPANIKOLAOU P.
Inviato: mercoledì 20 novembre 2013 15:49
A: [email protected]
Oggetto: st: re. information
Dear all,
Running this ttesti, I have got the results below. Does this mean that I
accept the hypothesis that he mean would be 423?
What exactly means each of the three Pr(T?t) seen below, please?
ttesti 12 367 32 423
One-sample t test
------------------------------------------------------------------------
------
| Obs Mean Std. Err. Std. Dev. [95% Conf.
Interval]
---------+--------------------------------------------------------------
------
x | 12 367 9.237604 32 346.6682
387.3318
------------------------------------------------------------------------
------
mean = mean(x) t =
-6.0622
Ho: mean = 423 degrees of freedom =
11
Ha: mean < 423 Ha: mean != 423 Ha: mean >
423
Pr(T < t) = 0.0000 Pr(|T| > |t|) = 0.0001 Pr(T > t) =
1.0000
Thanks, Panos
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/faqs/resources/statalist-faq/
* http://www.ats.ucla.edu/stat/stata/
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/faqs/resources/statalist-faq/
* http://www.ats.ucla.edu/stat/stata/
```

- Prev by Date:
**st: conditions based on stored results after model estimation in forvalues loop** - Next by Date:
**Re: st: conditions based on stored results after model estimation in forvalues loop** - Previous by thread:
**st: conditions based on stored results after model estimation in forvalues loop** - Next by thread:
**st: R: re. information** - Index(es):