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  • Screening (multi)collinearity in a regression model

    - by aL3xa
    I hope that this one is not going to be "ask-and-answer" question... here goes: (multi)collinearity refers to extremely high correlations between predictors in the regression model. How to cure them... well, sometimes you don't need to "cure" collinearity, since it doesn't affect regression model itself, but interpretation of an effect of individual predictors. One way to spot collinearity is to put each predictor as a dependent variable, and other predictors as independent variables, determine R2, and if it's larger than .9 (or .95), we can consider predictor redundant. This is one "method"... what about other approaches? Some of them are time consuming, like excluding predictors from model and watching for b-coefficient changes - they should be noticeably different. Of course, we must always bare in mind specific context/goal of analysis... Sometimes, only remedy is to repeat a research, but right now, I'm interested in various ways of screening redundant predictors when (multi)collinearity occurs in a regression model.

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  • PHP: Do we have any command via which we can delete the contents of an file without opening it.

    - by Rachel
    Is there any way to remove the contents of an file in php, do we have any php command that does that, I know unlink but I do not want to delete the file instead I just want to remove the contents of that file. I have an file which I pass while called a getCurrentDBSnap function, it takes in the file from /home/test/incoming folder and populates currentDB table state into the file using fputcsv and puts back file to /home/test/outgoing. Currently file stays in incoming folder and when I can call the function getCurrentDBSnap it would take the file and override with latest state of DB into it. Q: My question is, is it possible instead of overwriting the file, we can remove the content of file after ever getCurrentDBSnap such that file in incoming folder would be always empty ? Hope it makes sense :)

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  • sizeToFit label voids align right / set minimum width of label

    - by Deco
    Here is my code I am using to make a label (which contains content of an unknown length) the correct height for the content. (lines is equal to 0) myLabel.text =[NSString stringWithFormat:@"%@", myLabelContent]; myLabel.frame = CGRectMake(myLabel.frame.origin.x, myLabel.frame.origin.y, myLabel.frame.size.width, 800); [myLabel sizeToFit]; The only problem is, it is resizing the width as well as the height. I have two labels side by side, one aligned left, one aligned right. The left aligned one works fine. However, the right aligned one becomes intended (from the right). Because of its width resize, the content always starts at the origin.x position (in effect) because the label is made to be the shortest width required. I hope that makes sense. Is there a way to override or reset the width after auto resize had solved the height problem, or set a minimum width for the label? Many Thanks in advance, Deco

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  • How to get a list of names + a count of occurrences relating to the name from another table

    - by Jacob Degeling
    Hi, Hope my subject line was descriptive enough. Basically, I have a table called Students, and one called Absences. The Students table contains student information (Name, DOB, StudentID etc.), the Absences table contains any absences (Date, Reason, related by StudentID). I want to get a full list of the students, plus a count of their absences. Sample results would be: StudentName Absences ------------- ----------- Johnny 3 Mark 2 James 1 Anthony 0 Sharon 0 Can someone suggest a way I should tackle this problem? I would prefer to have a single SQL statement, possibly incorporating some views etc. Thanks, Jacob.

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  • how to import other schema jars when using the scomp tool

    - by MikeJiang
    there is a huge amount of xml schemas for the business, some of them are common types like Money.xsd, Address.xsd, etc, while others are business specific like Customer.xsd, ShippingOrder.xsd, etc. So I decide to compile these schemas into 2 jars, one is commonbeans.jar, the other is businessbeans.jar. I've separated them into different folders. to build the commonbeans.jar is simple, just run "scomp -out commonbeans.jar ....\common*.xsd"; while run "scomp -out businessbeans.jar ....\business*.xsd" is a different story, there are errors say can't find those common types, and run "scomp -out businessbeans.jar ....\business*.xsd ....\business*.xsd" will blindly duplicate all the common types into the businessbeans.jar. so is there any way to link the commonbeans.jar when compile those busimess schemas, maybe something like "scomp -out businessbeans.jar ....\business*.xsd commonbeans.jar". I hope my poor english has expressed my issue!

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  • MPI C fprintf() output not showing up if the process hangs on MPI_Recv

    - by Karolis
    I'm writing an MPI C program. I have troubles debugging it, because whenever I use fprintf, like this: fprintf(stdout, "worker: %d", worker); if the program hangs, because of some blocking MPI_Recv, I can't see any output. I'm sure the line of code is reached, because I can put a return statement after the fprintf statement, in which case the process finishes execution and the output is printed. Any ideas, on how to print (see the output) even though the process gets blocked later by Recv? I hope this makes sense.

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  • Filtering data in an array.

    - by user276424
    Hi all, I have an array that has 30 date objects. The date objects are indexed in the array from the minimum date value to the maximum date value. What I would like to do is retrieve only 7 dates from the array. Out of the 7, the first one should be the minDate and the last should be the maxDate, with 5 dates in the middle. The 7 numbers should increment evenly from the minDate to the maxDate. How would I accomplish this? Hope I was clear. Thanks, Tonih

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  • String cannot contain any part of another string .NET 2.0

    - by Aaron
    I'm looking for a simple way to discern if a string contains any part of another string (be that regex, built in function I don't know about, etc...). For Example: string a = "unicorn"; string b = "cornholio"; string c = "ornament"; string d = "elephant"; if (a <comparison> b) { // match found ("corn" from 'unicorn' matched "corn" from 'cornholio') } if (a <comparison> c) { // match found ("orn" from 'unicorn' matched "orn" from 'ornament') } if (a <comparison> d) { // this will not match } something like if (a.ContainsAnyPartOf(b)) would be too much to hope for. Also, I only have access to .NET 2.0. Thanks in advance!

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  • Classic ASP - How to convert string to UTF8 to USC2

    - by Brian G
    I have a problem where I am storing a UTF8 string in SQL Server as USC2, when I pull it out to display on a page with content-type set to UTF-8 it works fine. But I have a third party javascript component which when I pass it the string for the database it renders it as USC2. or not UTF8. Is there a way in ASP to convert this string to UTF-8 after reading it from the database to pass it to the third party component ( obfuscated ) . Hope this makes sense.

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  • Replace repeating character with array elements in PHP

    - by Will Croft
    I hope this is blindingly obvious: I'm looking for the fastest way to replace a repeating element in a string with the elements in a given array, e.g. for SQL queries and parameter replacement. $query = "SELECT * FROM a WHERE b = ? AND c = ?"; $params = array('bee', 'see'); Here I would like to replace the instances of ? with the corresponding ordered array elements, as so: SELECT * FROM a WHERE b = 'bee' and c = 'see' I see that this might be done using preg_replace_callback, but is this the fastest way or am I missing something obvious?

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  • WPF integrate Windows live authentication for Microsoft health vault

    - by AnD
    Hi all, I'm just wondering if there's any way for WPF application integrated with windows live ID? and it's actually for windows health vault [www.healthvault.com] so health vault is using windows live id or open id to login into their system. and what i gonna do is, creating wpf application (instead of web application) for health vault, so all of the login form username pass and everything is handled inside the wpf application without showing/using any internet browser. so since this's quite new for me, i hope if there's somebody ever did this before especially for health vault system that run on standalone wpf app. alright, so that's it, thank you in advance!

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  • How do i connect with dart community to suggest something

    - by Muhammad Umer
    I am new to this stackoverflow and programming. So HI!!!! What i hope to do is tell something that i think is important to Dart community. If somehow it was possible to code android and or iphone apps using dart that would be very awesome and same for Dart.... There is one path, that is making program in dart compiling it to javascript and then making app using Adobe air..... .But looks inefficient. so is there any other way which i am unaware of, via which i can build an android app at least.. using dart i know you can build an app, using javascript..and css+html...so i am looking for html+css+dart. It'd be cool if adobe air supports dart language directly.

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  • Ant database rebuild script, avoiding interactive prompting

    - by fras85
    Hi Guys. I'm writing an ant script to rebuild our database i.e. dropping everything and rebuilding from scratch. The problem our DBA adds a Y/N prompt before executing the rest of the script, and therefore we can't call this from an automated build process. Does anyone have any suggestions to circumvent the Y/N prompt? Obviously we could create seperate scripts, one for the DBA's and one for the automated build - but this requires maintaning both. We're running on Windows so it's not as easy as using sed to strip out the prompt...but i'm thinking something along those lines. Not sure if that's clear enough but hope you can help. Cheers.

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  • press button to open web page from app

    - by Lee
    I have an app that I want to interact with a web page. Basically I want to press a button and the web page will open in a new view... Sorry I wasn't clear, I am developing on a Mac for an iPhone. Currently I have a "locate me" app that displays your Latitude and Longitude. I want to use those variables to populate 2 of the blanks on a PHP web page/form I have developed. I have added a label and button to my current app, when the button is pressed the URL with the Lat and Long (as passed vars) are displayed in the label. I want those vars to appear on my web page. Hope this is clearer... Solved: I just added these lines of code I found here: NSURL *url = [ [ NSURL alloc ] initWithString: @"http://www.cnn.com" ]; [[UIApplication sharedApplication] openURL:url];

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  • Create Java method from a string?

    - by drozzy
    Is it possible in Java, to declare a method with a string instead of an identifier? For example can I do something like the following: class Car{ new Method("getFoo", { return 1+1; }); } //Use it Car car = new Car(); car.getFoo(); EDIT: I am adding a Purpose WHY I need this. In order to not hardcode method names when using Jersey and it's UriBuilder, which requires a method name: https://jsr311.dev.java.net/nonav/releases/1.1/javax/ws/rs/core/UriBuilder.html See path() method with signature: public abstract UriBuilder path(java.lang.Class resource, java.lang.String method) throws java.lang.IllegalArgumentException I hope my question is clear, if not - let me know and I can clarify it.

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  • running a batch file from oracle forms 6i using host

    - by user176217
    I am trying to run a batch file. the file is located here: C:\Program Files\Java\jre6\bin\getfile.bat I use this in oracle forms 6i: first i assign this path to a variable: tmp_msg := 'C:\Program Files\Java\jre6\bin\getfile.bat' then I use the host command: host( 'cmd /c' || tmp_msg, no_screen); This is exactly as I have it. It doesn't give me an error, but I don't get the result that I'm expecting. I'm actually executing java code in the batch file like so: java -classpath path;addedpackage.jar myClass I hope someone can help me with this. Thank you.

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  • Sending information back from delegate [iPhone]

    - by Andy
    I'm using NSXMLParser in my RootViewController.m file. NSXMLParser *xmlParser = [[NSXMLParser alloc] initWithData:response_data]; [xmlParser setDelegate:self]; [xmlParser parse]; [xmlParser release]; I'm also implementing this method to add entries to a dictionary defined in RootViewController.m for later use: - (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName attributes:(NSDictionary *)attributeDict However, I'd like to get more than one XML file and do different things when the file has finished; this sounds like I need to use external files as delegates. My question is: If I have the following implementation files (& their header files): RootViewController.m XMLDelegate1.m XMLDelegate2.m and set the ith NSXMLParser delegate to be XMLDelegatei.m, and get those files to return an NSDictionary that I can then add to the NSDictionary defined in RootViewController.m. I guess there are two methods of doing this: Use a method that I don't know about; or Use a better workflow I suspect it's 2, but hope it's 1. Thanks, Andy

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  • Sqlite3 activerecord :order => "time DESC" doesn't sort

    - by Ole Morten Amundsen
    rails 2.3.4, sqlite3 I'm trying this Production.find(:all, :conditions = ["time ?", start_time.utc], :order = "time DESC", :limit = 100) The condition works perfectly, but I'm having problems with the :order = time DESC. By chance, I discovered that it worked at Heroku (testing with heroku console), which runs PostgreSQL. However, locally, using sqlite3, new entries will be sorted after old ones, no matter what I set time to. Like this (output has been manually stripped): second entry is new: Production id: 2053939460, time: "2010-04-24 23:00:04", created_at: "2010-04-24 23:00:05" Production id: 2053939532, time: "2010-04-25 10:00:00", created_at: "2010-04-27 05:58:30" Production id: 2053939461, time: "2010-04-25 00:00:04", created_at: "2010-04-25 00:00:04" Production id: 2053939463, time: "2010-04-25 01:00:04", created_at: "2010-04-25 01:00:04" Seems like it sorts on the primary key, id, not time. Note that the query works fine on heroku, returning a correctly ordered list! I like sqlite, it's so KISS, I hope you can help me... Any suggestions?

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  • Flex 4: Defining a XML data model in an Actionscript Class

    - by Steve
    I'm really having a hard time accessing a data model I've defined in an Actionscript class in my Flex app. The following is my AS Class (Model.as): package { import mx.rpc.http.HTTPService; public class Model { private static var _instance:Model; public static function getInstance():Model { if (!_instance) _instance = new Model(); return _instance; } [Bindable] public var xml:mx.rpc.http.HTTPService = new mx.rpc.http.HTTPService(); Model.getInstance().xml.url = "http://127.0.01/RAF/DATAPOINTS.xml"; Model.getInstance().xml.resultFormat = "e4x"; } } I'm then trying to access this in my main application with the following code: Model.getInstance().xml.send(); var sectorList:XMLList = Model.getInstance().xml.lastResult; And it just keeps throwing errors. The errors are generic so I can't determine the source in debugging. Hope this is enough info...

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  • Should I stick only to AWS RDS Automated Backup or DB Snapshots?

    - by James Wise
    I am using AWS RDS for MySQL. With it comes on backup, I understand that amazon provides two types of backup - automated backup and database (DB) snapshot. The difference is explain in here - http://aws.amazon.com/rds/faqs/#23. However, I am still confuse if should I stick to automated backup only or both automated and manual (db snapshots). What do you think guys? What's the setup of your own? I heard to others that automated backup is not reliable due to some unrecoverable database when the DB instance is crashed so the DB snapshots are the way to rescue you. If I will do daily DB snapshots as similar settings to automated backup, I have gonna pay much bunch of bucks. Hope anyone could enlighten me or advise me the right set up. Thanks. James

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  • Pre-populating Radio Buttons with Java

    - by Gary Deuces Rozanski
    Is it possible to pre-populate a radio button, using jsp, depending on the value in the database? If so, how? I have done research here at StackOverflow & Google but with no real solution. p.s. I hope somebody can help me out with a question. As you will see from previous questions, I am not a developer, but get loaded with questions being the most technical on my team. oh the joy. Any help will be appreciated & I apologize in advance if my question is dumb.

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  • after dragging up, animate viewport up and after dragging down, animate viewport down...

    - by Luis
    I been trying to make this work for the last couple of days, I'm a new into web designing so I hope someone can help me out with this. I'm trying to run an animation after dragging the div container depending if the user is dragging up or down. This is the code that Im working on. this is the code when calling the jquery widget $ $('#container').draggable({scroll:true, axis: 'y', //scrollSensitivity: 1000, stop: function(event, ui) { if(scrollY <= 0){ $('#container').animate({ top: '-2000px' }, 500); } if(scrollY -= 0){ $('#container').animate({ top: '0' }, 500); } } });

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  • How does browser work with expiration headers, cache-control headers, last-modified-header ?

    - by Umair
    I am a web developer, have worked with PHP and .NET both. having over a year of experience working on web I haven't been able to understand the browser caching features thoroughly, I hope Web Gurus here can help me with it. Questions I have in my mind are : How does browser actually caches stuff, does it request for to see if the cached file has changed on the server or not, What is the Ideal way for a developer to make use of browser chaching to its full, but also to be able to push new changes on the site with no hassle at all. I think if browser somehow chaches my CSS and JS and Images, and then just makes a checks for their modification to the server everytime, this can sort the issue. but I am not sure how to do it, waiting for interesting answers :)

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  • How can I detect collisions between two images in c#?

    - by Shane Callanan
    hope you can help me out with this one. I'm new to c# so am very inexperienced. But basically I'm trying to make a game in which certain objects fall from the sky. Some objects like feathers take a while to drop, while metal balls will drop faster. You start off with a certain amount of cash and can buy weapons of your choice to place on the ground below. Now I've never done anything to do with collisions before, so simple answers will be of much help! Here are some of the collisions that will be in the game: (Not sure if different types of collisions are coded differently) -Collision between bullets and falling objects -Collision between falling objects and the ground (which is inanimate) -Collisions between falling objects and a certain radius around another object (for example, if a weapon gives off a radiation beam starting from its centre) -Collisions between rotating objects (rotating blade) and falling objects If someone could help me with this, it would be much appreciated!

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  • How to print absolute line number in uncaught exception?

    - by DSblizzard
    When error occured Python prints something like this: Traceback (most recent call last): File "<stdin>", line 2, in <module> File "<stdin>", line 8, in m File "<stdin>", line 5, in exec_st File "<stdin>", line 9, in exec_assign File "<stdin>", line 48, in ref_by_id IndexError: list index out of range where 2, ... , 48 are relative line numbers which are not very convenient. How to print absolute line numbers in such error messages? EDIT: Maybe it's a dumb question, but answer will facilitate development a little. I'm printing text in several files. When done, press shortcut which runs python and copies contents of current file to console. Proposed solution forces to press excess keystrokes (Ctrl+S, Alt+Tab) and create additional files. I hope I have put it clear.

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