Uenal Mutlu wrote: > Chess is IMO the best model for describing nearly everything > in life, even the life itself: if there can be at least one reaction > to an action, and this is usually always true, then one has to > re-evaluate the plan after every action. Chess is only a useful model system for the very limited class of zero sum games with perfect information. There are only two players and there must always be a winner or a draw. Everything relevant to the statement of the problem is unambiguous and precisely known to both sides. This is very unlike most real world problems. Chess also requires considerable strategic planning ability as well as tactical finesse to acheive any useful standard of play beyond patzer. If you treat software developing as a zero sum game who is the opponent? a) the customer. b) his problem you are trying to solve. It is completely useless and irrelevant for all other classes of problem where there is imperfect information, multiple players or win-win and lose-lose are also outcomes. Software specification is often bedevilled by unknown or unstated assumptions made by either the customer or the developers. The various parties on the customer side of the requirements specification often have unresolved and mutually incompatible aims and hidden agendas. If you must use a game analogy then contract bridge with the developers and customer working together to beat the original specified problem and the as yet unknown gotchas to an agreed contract might be a bit closer. It even incorporates some hidden variables in the unseen opponent hands of cards. > Applied to SW engineering, or any other project in life: a strict > pre-planning is impossible (much like in chess), a project must > be seen and practiced only as an iterative process where each > action and the response to it must lead to a re-evaluation of the > overall goals (global strategy), and then for refining the goals > and the strategy for the next turn (milestone/phase). No argument at all that you have to work to keep a project alligned with reality. And that requirements evolve as time progresses. Equally you have to beware of excessive feature creep or otherwise projects will never get finished as salemen promise ever more spurious features to new customers just to close the sale. > The consequence is: everything in life, incl. a project, must be > seen as a dynamic process, and there must always be the > possibility given for refining the next steps of the process . > Is this extreme? You aim to improve both the project in hand and the methods of delivering projects in software engineering. You never stop learning. Regards, Martin Brown

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Hi, If your requirement is not a time series then you can use Proc GENMOD in much better way. it is easy to use these (both logit/poisson). - Kiran KS ________________________________ From: SAS(r) Discussion on behalf of Wensui Liu Sent: Mon 5/28/2007 7:04 AM To: SAS-L@LISTSERV.UGA.EDU Subject: how to model poisson / logit model using proc model? Dear all, Is there anyway to model poisson or logit model using proc model in ets? I think it is doable given the power of proc model. Could you please shed some light on it? Thanks a lot. -- WenSui Liu A lousy statistician who happens to know a little programming (http://spaces.msn.com/statcompute/blog) *************************************************************************************************************************** This e-mail communication and any attachments may be privileged and confidential to Hexaware and are intended only for the use of the recipients named above. If you are not the intended recipient, please do not review, disclose, disseminate, distribute or copy this e-mail and attachments. If you have received this email in error, please delete the same alongwith all attachments thereto and notify us immediately at mailadmin@hexaware.com . *************************************************************************************************************************** ...

I read a lot of related materials, but none can tell the difference between the two software lifecycle model. And, Is Iterative model the same as Incremental model? Thanks & Regards > I read a lot of related materials, but none can tell the difference > between the two software lifecycle model. > > And, Is Iterative model the same as Incremental model? > The Spiral model is specifically risk-driven. It is iterative but each iteration is designed to reduce the risk at that particular stage of the project. My theory is it was introduced as a bridge to a purely iterative model. Barry Boehm introduced the spiral model in 1988 while he was working at TRW which must have been a conservative software development environment. I suspect they would have rejected a purely iterative model as lazy programming. Risk on the other hand is a legitimate concern so iterating to reduce risk was probably more tolerable. And it didn't mean giving up the waterfall model--you could still do the waterfall model during an iteration in the spiral model. I think of an increment as an improvement in the product. Each iteration should result in an increment. Eddie Burris Cheng Mo <mo.cheng@nospam.nospam> wrote in message news:<co0pd1$ipm$1@avnika.corp.mot.com>... > I read a lot of related materials, but none can tell the difference > between the two software lifecycle model. > > And, Is Iterative model the same as Incremental model? > > Th...

This is a repeat announcement, but our Web person tarted up the Departmental site and lost our links! The new link to down load the software, documentation and source code is: http://www.strath.ac.uk/Departments/ChemEng/new_staff_pages/clgs03/toppage12.htm I'd be interested in any comments/applications for those of you who try the programs. Regards, Bruce Postlethwaite ...

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Hi, I am trying to implement VoiP traffic model but I don´t understand one thing! frcatel.fri.uniza.sk/users/smiesko/publikacie/clanok3.pdf this above is document on which Markov model I am trying to generate VoIP traffic. On page 200. you can see how the human voice should look like, and on page 203. is the Markov model based on Exponential distribution. My problem is with this ON/OFF states! In ON it generates traffic and in OFF it doesnt, so it is 0. So it should switch from for instance 64 kbps and 0 kbps. But how can I make this beacuse ON and OFF transitions are modele...

Dera Sas community, Actually, I am looking for informations about running on SAS or (STATA, LIMDEP) a double hurdle model (dependent and independent CRAGG model), the Dominance Heckman Model, the complete dominance Heckman model and the Tobit model. My thesis is on "stand-by" and i will be glad if you share with me your programs to run these models. Would you tell me if SAS, STATA or LIMDEP include friendly routines for running these models? and how to do it ? Thank you so much, Imad R., PHD Candidate ...

hello, how do solid modeler and surface modeler algorithmically differ?? i.e what i perceived so far after reading about them is 1)the surface modeler can draw surfaces so that you can tell whether a point is on it or not and 2)you can draw solids so that you can tell whether a point is inside,outside or on the solid or not?? now algorithmically the solid modeler just adds the point normal information and compares it with the surface normals..so does it mean that the developer of surface modeler are lazy to put just a point normal information and make their modeler as solid modeler??? regd...

Hello SAS-Ls, Could someone give me some advice about how to choose adjusted Poisson model and NB model? I'm analyzing an over-dispersed data, the NB model shown one variable is not significant, but when I used scale deviance adjust poisson model, that variable becomes significant. I'm not sure which model I should use? why the adjusted poisson model does not consist wit�衡 NB model? Jane --------------------------------- Get easy, one-click access to your favorites. Make Yahoo! your homepage. ...

Hi, I am looking for an apporpriate program to be able to model the time series data with good flexibility. How does SAS compare with STATA in programming VAR model in this perspective? Is it easier to create more personalized models? Thanks. ...

Hello, I am searching for "standards", well established "methods" for representing (modelling) contextual data. Question you might ask: What do I mean when saying context? Context is not a clear defined term, we are all aware of that and the usual definitions can be read within all those papers flying around. Imagine you have a standalone application which tracks and records your behavior (your interaction with the application) and the surrounding environment (time,day of week, location, etc.) - let's assume all of that makes up "my" context. 1. What are &q...

Hi, anyone can help me. I have one data witch vary weight of animals each twenty-eight days and I want biuld one equation for the to describe the for average daily gains from birth to gain of born out slaughter, for the animals, but I'm dont getting to make. data cattle; input animals breed sex $ age weigt1 weigt2 weigt3 weigt4 weigt5; cards; 1037 RACRNE F 12/10/2006 35 62.0 76.0 96.5 115.8 941 RANE F 13/10/2006 32 59.5 73.8 88.5 110.3 1036 RANE F 5/10/2006 33 60.5 73.0 90.3 111.5 1030 RACRNE M 5/10/2006 36 66.5 88.0 110.8 123.8 978 RACRNE M 23/10/2006 26 42.5 59.5 77.5 96.3 1059 RANE M 8/10/2006 39 71.5 89.8 110.8 130.8 ; I do know make witch SAS to recognize the age this is form. ...

Hi I am writing c mex s functions for simulation. I would like to use the models initial inputs to initialise states, when I use ssGetInputPortRealSignalPointers in the modelstart or model initialise conditions function it always returns zero for the model inputs no matter what the inputs are. Does anyone no why or how to get around this ?? this is the code const real_T *u = (const real_T*) ssGetInputPortRealSignal(S,0); Vcx = u[0]; Vcy = u[1]; omega = u[2]; Fz = u[4]; thanks robin robin northcott wrote: > > > Hi > I am writing c mex s functions for simulation. I woul...

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 FOSS use and development also can be compared to bees ,----[ Quote ] | After a few days of cleaning, bees will take on | other hive chores like feeding larvae and | grooming the queen, taking pollen, water and | nectar from foraging bees and placing it where | needed. | | When the new FOSS user gets beyond the 'feeling | out' stage, they begin to identify areas that | need improvement or finding alternatives.They | will post specific questions on forums asking | "how to.." and generally set about the task of | 'tweaking' their software or app. | | After a few weeks of housekeeping duty, bees | are pretty much fully developed now in terms of | everything from flying to stinging. They now | become ( usually) guard bees, inspecting every | bee that comes into the hive to be sure it | belongs and warding off any potential threats | to the colony. `---- http://linuxgeeksunited.blogspot.com/2009/10/foss-use-and-development-also-can-be.html The rejuvenation of community-controlled open source ,----[ Quote ] | Jay recently speculated, and I agreed, that we | may be starting to see a return to support and | other services, rather than commercial code and | licensing, as the preferred mode to monetize | open source. `---- http://blogs.the451group.com/opensource/2009/10/15/the-rejuvenation-of-community-controlled-open-source/ Recent: Computer OS's and Bee Hives ,----[ Quote ] | Li...

How to model synchronous machine as voltage source in order to connect it to the transformer winding. In all matlab versions synchronous machine is modeled as current source .That can not be connected in series with the transformer.So it is aking that add a high value snuber resistance. My dought if i connect high value of resistance then that value of resistance will act as load so the power developed by synchronous machine will get absorbed by snubber resistivance. whether is there any chances of snubber resistance acting as a load ? ...

Many yeas ago I had read that the Analysis Model is concerned with the "what" and not the "how". It is the Design Model that is concerned with the "how" part. Frankly speaking, I never found that tip very useful. After many months of deliberation I have now concluded that the Analysis Model is the same as the Design Model, except that we don't talk about the following: Technologies Protocols Algorithms Data Structures This simple tip has helped me immensely, not only to come up with better Analysis Models, but also to earn the respect of my peers. Regards, Sandeep Sharma I like to think as tha Analysis Model as being the bit that figures out what the current system does and the Design Model as figuring out what changes you need to make to facilitate the customers new requirements. You are going to have duplicated bits, for example, you have the AOM (Analysis Object Model) and DOM (Design Object Model). I think you will still need to address those items you list below. For example, your still going to need to know the current protocols and agorithms etc. used, otherwise, how would you know if they need changing or not. On 5 Aug 2003 19:06:38 -0700, sandeep6699@yahoo.com (Sandeep Sharma) wrote: >Many yeas ago I had read that the Analysis Model is concerned with the >"what" and not the "how". It is the Design Model that is concerned >with the "how" part. Frankly speaking, I never found t...

Hey All, I some data which I am fitting. It is not important what model we use so if you have a good suggestion feel free to let me know. My goal is to repoduce the ripples in my data at high frequency and force it through a point at zero frequency- so I am not sure I can use polyfit(but I am sure I am wrong about that). I saw some algorithms on here to do it. But I think you could just do it using fit? Here is how I thought to do it- ------------------------------------------------------------- opts = fitoptions('Method','LinearLeastSquares','Robust','on',...

take a look at proc varmax. On Mon, Apr 6, 2009 at 1:35 AM, Mephy <whumeipeng@gmail.com> wrote: > Hi, I am looking for an apporpriate program to be able to model the > time series data with good flexibility. How does SAS compare with > STATA in programming VAR model in this perspective? Is it easier to > create more personalized models? Thanks. > -- ============================== WenSui Liu Acquisition Risk, Chase Blog : statcompute.spaces.live.com Tough Times Never Last. But Tough People Do. - Robert Schuller ============================== ...

Hi all, I want to check my model with the model advisor, but the model advisor shows no model that I can analyze although I start the advisor from the model to be tested. Any suggestions? I have RTW and Simulink, so at least these checks should be available. Thanx for help, Marc bump... ...

Hello everybody, Every now and then, a question pops-up on this forum, that initiates the discussion on how the relational model relates to the object model, and how one of them is better (or worse) than the other. While being an OOD believer (I've been working in C++ for more than 10 years) I do think that it is quite difficult sometimes to ensure data integrity by "chasing pointers" that connect objects. Besides, if you want to boost performance, you often have to introduce redundancy, because no data structure fits perfectly to every possible usage. Handling redundancy by hand is not fun (and programming is supposed to be fun, isn't it?). The relational model, on the other hand, provides a very simple high-level language to convert data from one form to another -- relational algebra. The redundancy (indexing) is easily managed. Besides, relational tables are easily serializable. The biggest problem, however, is that when people think "relation", they usually think "persistence", "SQL" and "Oracle" (or any other RDBMS on that matter). The next moment, unless you have to manage tera-bytes of data, you decide to relax, and think of something more plesant (like "interface", "polymorphism", or "decorator"). Does it really have to be this way? What if it was possible to define relational tables right inside your code, in the same way you create an array or map? These tables would ...

How would I set this amx2221 model up in Excel? Discrete-time IDPOLY model: A(q)y(t) = B(q)u(t) + C(q)e(t) A(q) = 1 + 0.3233 q^-1 + 0.1241 q^-2 B1(q) = -0.06747 q^-1 + 0.1398 q^-2 B2(q) = -0.1179 q^-1 + 0.08921 q^-2 B3(q) = 0.2373 q^-1 - 0.2245 q^-2 B4(q) = -0.3048 q^-1 + 0.07673 q^-2 B5(q) = 1.408 q^-1 - 0.6527 q^-2 B6(q) = 0.2355 q^-1 - 0.2538 q^-2 B7(q) = 0.2059 q^-1 - 0.2689 q^-2 B8(q) =...

I am currently programming a model of a finite quantum well and have run into a couple of problems. After applying boundary conditions, I get two equations: tan(theta) = sqrt(theta_knot^2/theta^2 - 1) cot(theta) = -sqrt(theta_knot^2/theta^2 -1) The parameters theta and theta_knot have the width of well, barrier potential, and mass of the electron embedded in them. I tried solving this in two ways: 1) I arranged loops to solve using the "solve" command for transcendental equation but the cotangent argument was causing a problem. 2) My other attempt consisted of incrementing ...

Hi, Variable "age" was significant in multiple hierarchical regression for main effect model. So, I thought age was important for posttraumatic stress disorder (PTSD). However, age was significant in multiple hierarchical regression for interaction effect model. I mean 1st step: traumatic experience --> significant 2nd step: age --> significant 3rd step: traumatic experience * age --> significant In this case, how can I interpret this result of age? Does the existence of interaction effect suggest that the data are more supportive of the interaction model? Thanks, On Sun, 15 Aug 2010 04:35:23 -0700 (PDT), ??? <ksr6452@gmail.com> wrote: >Hi, > >Variable "age" was significant in multiple hierarchical regression for >main effect model. So, I thought age was important for posttraumatic >stress disorder (PTSD). > >However, age was significant in multiple hierarchical regression for >interaction effect model. >I mean > 1st step: traumatic experience --> significant > 2nd step: age --> significant > 3rd step: traumatic experience * age --> significant > >In this case, how can I interpret this result of age? Does the >existence of interaction effect suggest that the data are more >supportive of the interaction model? > By "hierarchical", I interpret this to mean that you tested the variables, by intention, in this order. It ...

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