Gebruiker:Pjetter/klad
<Londenp> Hi. Question for someone who knows the Parser functions: Is there a way how I can find out with parser language if a certain article is in a category. Something like if AAA is in CAT:BBB then display a certain image? <Splarka> probably need DPL for that (depending on what you wanna do exactly) <Londenp> In fact it is for Wikibooks <Londenp> We have categorized the books in fases 0 to 4 <Splarka> or in JS or CSS <Londenp> I would like to show on the front page a bookname together with a symbol for the development states <Londenp> I couldn't find a solution with magic words and a parser <Splarka> Londenp: well, what categorizes it? a template? or the [[category]] added directly? <Londenp> with a template <Splarka> so, like {{devstate|3}} ? <Splarka> you can use the template to categorize, and generate the image <Splarka> say you had {{devstate|3}} for example <Splarka> [[Category:Development state {{{1|0}}}]] <Splarka> {{#switch:{{{1|none}}} <Londenp> OK <Duesentrieb> Splarka: but he wants the image not on the page that is categorized, but on a pages that links to the page that is categorized <Splarka> |0=[[Image:Devstate_0.png|40px]] <Splarka> |1=[[Image:Devstate_1.png|40px]] <Splarka> etc <Splarka> really? hmmmm' <Londenp> Duesentrieb exactly <Splarka> DPL or javascript <Duesentrieb> don't know if something like that exists.in any case, it would be tricky with parser cache <Splarka> javascript could do it in a quick query to the API <Londenp> We have Dynamicpagelist installed <Duesentrieb> disabling it is the obvious solution, that would suck for the front page though <Splarka> (but on the front page that would be messy) <Splarka> DPL should be able to do it then <Londenp> not DPL alas <Splarka> which wikibooks? <Londenp> nl <Londenp> Rereading the remark from Duesentrieb it is still a little different <Splarka> useful how it doesn't say what version of dpl it has * Splarka grumbles <Londenp> it is the old old one <Londenp> http://www.mediawiki.org/wiki/Extension:DynamicPageList/old This one <Splarka> drat, don't think you can do what you want with it then <Londenp> That is what I thought <Londenp> It is very useful though, but the most modern version of DPL is much better <Londenp> but I was not allowed to let that be installed on nl.wikibooks.org <Londenp> might try again thoug on bugzilla <Londenp> So my idea is this {{template|bookname}} for each book <Londenp> this will show a link to the book and display a image for the status of development of this book <Londenp> this will automatically be updated if the status is changed <Splarka> only way I can think of is the API, but on the mainpage that would be a lot of queries to it (and it isn't cached) <Splarka> or a custom extension <Londenp> The information for the status of the book is with a DPL-thing in a hidden category and the template would look in which hidden category for the status it is and then display the according image <Londenp> OK too bad then <Splarka> OR.. you could create subpages for each book, that indicate the status <Splarka> such as {{Somebook/status 1}} <Splarka> and use #ifexist <Splarka> but that'd be... messy <Londenp> That is a good idea <Londenp> Sparkla Thanks I will try that then <Splarka> uhoh <Splarka> don't you hate it when someone is threatening to jump off a bridge, and you say "go for it" sarcastically.. and then they do... <Splarka> Londenp: you could also create one subpage, like [[Bookname/status]] <Londenp> You might give me another choice :-=) <Splarka> and have that /status contain the image that you want to transclude <Splarka> and then always transclude [[{{{1}}}/status]] if it exists <Splarka> that way you don't have to create and delete pages continually <Londenp> yep <Splarka> {{#ifexist:{{{1}}}/status|{{{{{1}}}/status}}|[[Image:Nostatus.gif]]}} <Londenp> In fact we have something like an Infobox with the book that contains all information already * Splarka nods <Londenp> I just don't know how to substract that <Splarka> heh <Splarka> well, then... <Splarka> what if /status only contained the number <Splarka> 0 to 4 <Splarka> and on the infobox: <Splarka> [[Category:Development status {{{{{FULLPAGENAME}}/status}}]] <Splarka> and on the main page: <Splarka> {{#ifexist:{{{1}}}/status|[[Image:Status_{{{{{1}}}/status}}.gif]]|[[Image:Nostatus.gif]]}} <Splarka> then you just update that /status page, and both the main page and the infobox are changed <Londenp> OK, looks good <Londenp> but I need a little time to understand this (not being educated) * Splarka nods <Londenp> Sparkla thanks, I am going to study your proposals and work it out. When I have some more questions I will return. <Splarka> thanks for the warning ^_^
test 1234567890 1234567890 1234567890 1234567890 1234567890 1234567890 1234567890 1234567890 1234567890
Citaten Papier
[bewerken]- The paper burns, but the words fly away - Ben Joseph Akiba
- What the world really needs is more love and less paper work - Pearl Bailey
- Anything on paper is obsolete - Craig Bruce
- This paper will no doubt be found interesting by those who take an interest in it - John Dalton
- When the weight of the paper equals the weight of the airplane, only then you can go flying - Donald Douglas
- When you sell a man a book you don't sell him just 12 ounces of paper and ink and glue-you sell him a whole new life - Christopher Morley
- A specification that will not fit on one page of 8.5x11 inch paper cannot be understood - Mark Ardis
- A child's life is like a piece of paper on which every person leaves a mark - Chinese Proverb
Version | Release Date | Comments |
---|---|---|
1.7 | 13/03/2007 | Ignore non-list lines when generating blacklist |
1.6 | 15/01/2007 | Support multiple-language translations |
1.5 | 16/12/2006 | Don't block all usernames when the blacklist contains blank lines Use Unicode-friendly regular expressions Don't show errors when the blacklist contains only comments (above fixes from Brion Vibber) |
1.4 | 19/06/2006 | Fix fatal error |
1.3 | 06/07/2006 | Cache blacklist in memcached or similar, if available |
1.2 | 25/04/2006 | Performance rewrite Allow users with the uboverride permission to pass the blacklist |
1.1 | 08/03/2006 | Make compatible with MediaWiki 1.5.8 Allow commenting out lines with # |
1.0 | 09/01/2006 | Initial version |
Boekenplank en boekenkast
[bewerken]Links:
- de:Wikibooks:Bücherregale - interessant is de opdeling vooral in werkgroepen per vakgebied en de organisatiestructuur
- en:Wikibooks:Departments - optisch niet bijzonder interessant
- fr:Wikilivres:Tous les livres - eigenlijk geen boekenplank en geen organisatie naar groepen, maar gebruikmakend van de categorie-structuur
Sjabloon:Crystalclearnavigatie
math
[bewerken]Normal multiplication turns this into:
The expectation of theta is exactly theta, so you can write it like that:
Add two parameters: one with a negative sign and the other with a positive sign (the sum of both is 0, but you can use that in additional calculations)
Now the second part is the usual (a-b)^2, which can be written as a^2 - 2ab + b^2. You just work the other way around.
And the first part is the variance of theta-hat and the second part is the bias. This can be written as:
Now when theta-hat is unbiassed this means that the expectation of theta-hat is equal to theta and therefore the bias is zero.
And that means that the MSE of theta-hat is exactly the variance of theta-hat.
If we take for theta the mu and for theta-hat the X-bar, you will use the normal variance for a n-sample from a population (X) with mean μ and variance σ2 you will get:
Another calculation will be as follows: We start again with:
Now we replace theta-hat with X-bar and theta with mu and you get:
We will replace X-bar in this equation with the following:
So you get:
This you can write differently according to:
and
which will lead to:
We take the n in the denominator out and this becomes squarred:
which turns into:
Now the expectation is redistributed in the equation:
We know that the definition for sigma is
so you get:
This is the variance of the unbiassed sample distribution of the mean
regression
[bewerken]The sum of squares to be minimized is
so
So we do some derivation and you get for minimization the derivative is set to 0:
Divide both sides by -2 and redistribute the summation any will get:
Take beta out and divide by Sum xi2:
And therefore the least squares estimator for β, is given by
Biasedness
[bewerken]So check if
Let us use this on the estimator in a):
Now let us fill in the proposed population model into this equation:
and you will get:
Which is:
And this can be written as:
According to biasedness equation above we can take the expectation from both sides according to:
and as
you get:
Therefore unbiasedness applies.
Sigma
[bewerken]First we start with the equation:
rearrange:
SSR
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sigma
[bewerken]
Take the variance of beta-hat:
Fill in the estimator of a):
Now use the equation for Yi:
and fill that in the previous equation and you get:
Two typical properties of variance when X and Y are independent are the following:
and
this will be used:
Using the definition given for Variance of epsilon:
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