If there's a questionaire that has questions like if you answered yes to this question, then skip the next 2 questions, how would I address these missing values? Would I ignore them when making a model for this data?
121148
Some of the variables are questions that are not being asked to every single person in the questionaire depending on how they answered previous question(s). So would I still be able to use a logistic regression if some of the questions (the independent variables) are only measuring the responses of SOME of the respondents?
80390
Is there any workaround or way to filter or search for messages that have no subject line?  I can see there is no way to filter messages when some field is "missing".
1522
In general, when can I omit that from a sentence?   Can I omit that (emphasized) in sentence (2) below?        We say that such algorithms handle concept drift and can learn from time-changing data streams.   When the statistical properties of the target variable change, we say that concept drift has occurred.   She told me that some of her classmates failed.      To me, sentences (1) and (3) sound better without that. If I omit that from (2), it just doesn't sound right when I read it out loud. (I should point out I'm not a native speaker.)  How do you decide when to omit it? Is it just a matter of taste? (I know that is sometimes mandatory.)  Can you think of sentences that "sound better" with that? Can you think of sentences that "sound better" without that? Can you think of a few sentences where it is wrong to omit that?
19551
Regarding , made by me, and general questions in this matter. I did receive decent answers on the question that was asked, but it wasn't asked clear enough by me I now see. I do not want to invalidate the answers by completely restructuring the question. Should one post a new question ignoring the other? or Should one refer to their old post and writing a short &quot;because x I reposted this...&quot;?
85078
Let's say that I want to ask a simple question like "How are planes able to fly?" or "Where on the internet can I find the list of all presidents of USA?". Asking these questions I'd have to add a description because otherwise I get the error:     Body is missing.   What if I have nothing to add? Should I repeat the question? In my opinion adding why I need the answer to these questions is useless and clutters the thread.  Edit: This is not the same question as mentioned "How to leave body of question empty?". I'm asking why can't it be empty. Ramhound's comment on that question does not satisfy me at all. Not exery question needs more details. Examples what I should add as a description to mentioned above questions are welcome so I can feel what to add to my future simple questions.  The Tin Man's comment also doesn't satisfy me. In my opinion, SE is also for simple questions and they are not always simple.
28200
When I  question, It says following:     Wait! Some of your past questions have not been well-received, and   you're in danger of being blocked from asking any more.      For help formulating a clear, useful question, see: How do I ask a   good question?      Also, edit your previous questions to improve formatting and clarity.   Here is screen-shot:   So, What should I do? (How long to wait?)
20579
Let's say that there is a question asked in a bad manner, in a way that the question is missing. For example the user shows the code and doesn't explain very well which is the problem.    Usually someone starts digging in the OP mind posting comments and asking him for details. It may happen that the question gets edited and the OP edits it to a valid question.    Do you usually give the OP time to edit the question or you immediately vote to close it?
25666
I'm doing the conceptual model for a survey database.  The goal is store the answers given by users (it's going to be an Android app).  I have three entities: user, question and option.  A question will have one or more options (for example: How many employees do you have? 1-40, 40-1000, +1000).  Options will have a text (1-40) and a value (the value selected by user).  User will select one (or more) of these options.  My conceptual design is:    I don't know how to associate an answer with an user.  How can I represent that relation? Do I have another entity to represent option value?  This model will store questions and pre-made answers (offered answers) and allows them to be re-used in different surveys.  I have to represent question like this one:    This question is related to this one:
68981
A user has asked  which did not receive much attention, and thus the user deleted the post. After some time, the user asked the  (with just slight changes to the title and a tag change), so that it could receive a bit more attention. The strange thing is that the question was not downvoted or poorly written, and yet the user deleted the original post. Now, since the original question was deleted, I could not mark the new one as a duplicate (it threw an error). My question is, how do we handle such questions? Just let them be as such or let the user know about it or is there another way to handle such situations?
61387
I'm trying to  when I run into this:     "You have already deleted 5 of your own posts today; further deletes are blocked"      I found conflicting information on this very annoying limit:   This post from May 25, 2010: . This is marked . If this is no longer the case, please edit that question and flag it as . Then , indicates that the problem has risen from the dead -- despite :     Each time that I've seen it (pruning subpar answers), it's been a user who is deleting their own redundant zero-upvote answers. Can you tweak the algorithm slightly so answers with less than one upvote don't count towards tripping this flag?     (Emphasis added.) :     I don't mind it when         cleaning up redundant answers on questions that have multiple alternate good answers   cleaning up old, "less awesome" answers that are no longer reflective of the user's current skill level         (Emphasis added.)     So why do we have barriers in place, to making SO answers less, "less awesome"?      Proposed Solution:  Please let us (¿once again?) delete an unlimited number of our own answers, when they have zero up-votes and are not marked as the answer.  Otherwise, please edit the linked questions to clear up the confusion.
122437
I have some survey response data that are inconsistent and I'm not sure what is the best way to handle them.  This is the nature of the inconsistency:    Have you ever had a food poisoning episode that you think might have been caused by the food in a particular restaurant ? a) Yes b) No Did any of these episodes prevent you from eating at that restaurant again?  a) Does not apply, never have had a food poisoning episode b) Yes c) No Following these episodes, did you come back to your normal condition after 24 hours?  a) Does not apply, never have had a food poisoning episode b) Yes c) No   I believe that the intent of the designers of the survey was that anyone answering "No" to 1) should answer "Does not apply" to 2) and 3), but that's not how it worked. A large group of respondents picked "No" for 1) and "No" for at least one of 2) or 3).    What is the best way to deal with this inconsistency?    Where are some good references (books, papers, websites, etc.) to look at discussions and solutions for issues of this kind, and data cleaning in general?
21764
Sometimes only 10 lines of 100 are relevant to the question/answer, the other  90 are setup.  Is there a way to hide 90 those in lines in the answer?
65857
We have an application that various other departments will use to create questionnaires. These questionnaires can hide or show extra questions based on responses to previous questions.  When creating the questionnaires, authors may decide to display completion as a percentage or with a progress bar, with the progress bar working off of author-defined milestones.  Because of the dynamic nature of the questionnaire, we can't reliably know how many questions the user must answer. We have agreed it is bad to show negative progress, so for percentages we assume all questions will be shown and if we pass a group of questions that we will not show, the percentage may jump a significant amount (e.g. progress may move from 5%, to 10%, to 15%, then we skip a group of questions and end up at 70%).  Our progress bar looks something like this:  (O)===(O)===(X)---()---()---() or  (O)===(O)===(O)===(O)===(X)---()  We aren't sure to handle the dynamic questions for this display. We have discussed a few options:  1) Only show the extra milestones once we know they are necessary. We don't like this, because we feel this is similar to reducing progress percentage -- suddenly the user is ambushed by extra work, or so it would seem.  2) Stop showing the milestones once we know they aren't necessary. This may result in, for example, a user going from step 3/8 to step 4/5. We are worried this may confuse users as it changes the number of apparent steps.  3) Show all the milestones, but simply skip ahead in the display. This may result in the user going from step 3/8 to 7/8. We are worried this ALSO may confuse users as they won't know why they have been moved forward or why they don't have access to those questions.  We are leaning towards option 3.  How should we best solve this problem? Are we on the right track with option 3, above? Is option 2 better and we just worry too much?  If we skip steps, as in option 3, should we differ how we display the skipped steps from how we display completed steps?  If it matters, the questionnaire authors will be typical office staff (not technically inclined) so we can't guarantee we can pass the problem off by training them to build questionnaires and choose milestones based on progress bar limitations. End users (people taking the questionnaires) must be assumed to be relatively uncomfortable with technology in general.
75916
Look  to see what I mean? Should I ask one of these guys to delete their answer (and merge whatever detail is missing into the other answer)? I'm aware of this , but it's a little different.
30694
Today I was looking at the question of this . The question was pretty simple, he was looking for the eval function in  not knowing of it's existence. He received a comment and while I was finishing reading the question, I saw him commenting      Thanks, eval() is what I was looking for.   and then he deleted his question. In my opinion, such behavior isn't appropriate. So, should I just ignore this or can I do something about it?
59708
This is just an idea I've been toying with , really. I'm curious about the correlation  between  question length and question quality. "Quality" here would be translated into "likelihood of not being closed."  Because when you go through Stack Overflow, most of the very short questions end up having issues of some kind.   But is there a way for us to measure whether there's a lower threshold whereby we are very certain that the question is problematic? For example, I doubt anyone would argue that you can make a great question with just 15 or so words.  For example, here's a demo I just ran &amp; subsequently deleted:        But surely you'd rather see an example from the real jungle, here's a recent one:        My question is - why were the body-size limits determined to be  30 characters (though I believe there's a typo there, as it's not simply 30 char's)?
44421
What happened to the close vote option for posts that describe an error or unexpected result but don't include the relevant code or any code!? This is on of the two most popular I use.. What am I supposed to do about questions like  now!?  I just also noticed "must show minimal understanding" is missing as well. After reading over the new option again, I am supposing that the intention is to use "not likely to be helpful for future viewers" for both of these?