Frage zu Diagramm/Statistik? < Biologie < Naturwiss. < Vorhilfe
|
Hallo zusammen,
ich habe mir eine Frage zu Fig. 4 in folgendem Paper gestellt: http://www.pnas.org/content/109/30/12135.full
Und zwar habe ich mich gefragt, was dort in Teil A die zwei Sternchen bedeuten. Angegeben ist ja **P < 0.01
Ich vermute, dass das irgendwas mit einem Fehler zu tun hat? Kann mir vielleicht jemand dabei weiterhelfen? Es geht wirklich nur um die Bedeutung von den Sternchen bzw. der Angabe, dass **P < 0.01....
Danke schonmal!
Viele Grüße,
Isabelle
|
|
| |
|
| Status: |
(Antwort) fertig  | | Datum: | 02:43 Di 07.05.2013 | | Autor: | Josef |
Hallo
"What's so special about a p value of 0.05, or a confidence interval of 95%? Nothing really. Someone decided that it was reasonable, so we're now stuck with it. P < 0.01 has also become a bit of a tradition for declaring significance. Both are hangovers from the days before computers, when it was difficult to calculate exact p values for the value of a test statistic. Instead, people used tables of values for the test statistic corresponding to a few arbitrarily chosen p values, namely 0.05, 0.01, and sometimes 0.001. These values have now become enshrined as the threshold values for declaring statistical significance. Journals usually want you to state which one you're using. For example, if you state that your level of significance is 5% (also called an alpha level), then you're allowed to call any result with a p value of less than 0.05 significant. In many journals results in figures are marked with one asterisk (*) if p<0.05 and two (**) if p<0.01."
![[]](/images/popup.gif) Quelle
Viele Grüße
Josef
|
|
|
| |
|
| Status: |
(Antwort) fertig | | Datum: | 02:48 Di 07.05.2013 | | Autor: | Josef |
Hallo,
"P value,
(in research) the statistical probability of the occurrence of a given finding by chance alone in comparison with the known distribution of possible findings, considering the kinds of data, the technique of analysis, and the number of observations. The P value may be noted as a decimal: P <.01 means that the likelihood that the phenomena tested occurred by chance alone is less than 1%. The lower the P value, the less likely the finding would occur by chance alone."
Mosby's Medical Dictionary, 8th edition. © 2009, Elsevier.
Quelle:
http://medical-dictionary.thefreedictionary.com/P+value
Viele Grüße
Josef
|
|
|
| |
|
| Status: |
(Mitteilung) Reaktion unnötig  | | Datum: | 19:57 Di 07.05.2013 | | Autor: | Isabelle90 |
Vielen Dank! Das hat mir sehr weitergeholfen!!!
Viele Grüße,
Isabelle
|
|
|
| |
|
| Status: |
(Mitteilung) Reaktion unnötig | | Datum: | 08:15 Do 09.05.2013 | | Autor: | Josef |
Hallo Isabelle,
> Vielen Dank! Das hat mir sehr weitergeholfen!!!
>
Das freut mich!
Viele Grüße
Josef
|
|
|
|
