All Discussions Tagged 'Modeling' - AnalyticBridge2020-09-24T17:19:10Zhttps://www.analyticbridge.datasciencecentral.com/forum/topic/listForTag?tag=Modeling&feed=yes&xn_auth=noQueries in modelingtag:www.analyticbridge.datasciencecentral.com,2015-12-29:2004291:Topic:3385312015-12-29T14:24:55.267ZRaghu Chittarihttps://www.analyticbridge.datasciencecentral.com/profile/RaghuChittari
<p>Hi all,</p>
<p>I am from engineering background. I would require your help in certain modeling concepts. Your help would be greatly appreciated!</p>
<p>Following are my few questions...</p>
<ol>
<li>If a variable which is important from business standpoint has a p-value of 0.5, then should it be considered in the model? If Yes, then wouldn't it make the model coefficients unstable?</li>
<li>Should I standardize the variables before building a logistic regression model? If Yes, is there a…</li>
</ol>
<p>Hi all,</p>
<p>I am from engineering background. I would require your help in certain modeling concepts. Your help would be greatly appreciated!</p>
<p>Following are my few questions...</p>
<ol>
<li>If a variable which is important from business standpoint has a p-value of 0.5, then should it be considered in the model? If Yes, then wouldn't it make the model coefficients unstable?</li>
<li>Should I standardize the variables before building a logistic regression model? If Yes, is there a commonly followed approach?</li>
<li>I am planning to develop a logistic regression to rate the employees as good or bad. The model includes variables such as his innovation score, #papers published, salary, Training cost, etc. First two are kind of assets to the company and the next two are kind of liabilities. Should I explicitly make the model understand this by considering the liabilities as negative values?</li>
<li>I have two independent variables in my LR model. Var1 has levels 'A' and 'B'. Var2 has levels 'X' and 'Y'. Of the entire dataset, there are 30% observations with Var1 as 'A' and Var2 as 'X', 35% observations with Var1 as 'A' and Var2 as 'Y', 30% observations with Var1 as 'B' and Var2 as 'X', 5% observations with Var1 as 'B' and Var2 as 'Y'. The number of observations with Var1 as 'B' and Var2 as 'Y' are far too less compared to other combinations. Is this skewness in data going to affect my results? If so, how should I rectify this?</li>
</ol> Attribution Modeling vs Market Mix Modelingtag:www.analyticbridge.datasciencecentral.com,2013-06-25:2004291:Topic:2528202013-06-25T10:44:23.222ZArunhttps://www.analyticbridge.datasciencecentral.com/profile/Arun
<p>I've recently come across Attribution Modeling and it seems to be the talk of the town in many areas. I tried googling about it, and figured out much about the basic skeleton of what it is. But what I'd like to know is,</p>
<ul>
<li>How different is it from Market Mix Modeling (MMM) ?!</li>
<li>Where is it more applicable that MMM?</li>
<li>What are the advantages of one method over the other?</li>
</ul>
<p></p>
<p></p>
<p>I've recently come across Attribution Modeling and it seems to be the talk of the town in many areas. I tried googling about it, and figured out much about the basic skeleton of what it is. But what I'd like to know is,</p>
<ul>
<li>How different is it from Market Mix Modeling (MMM) ?!</li>
<li>Where is it more applicable that MMM?</li>
<li>What are the advantages of one method over the other?</li>
</ul>
<p></p>
<p></p> Using a Hurdle Model in Credit Scoringtag:www.analyticbridge.datasciencecentral.com,2013-06-20:2004291:Topic:2522582013-06-20T18:53:10.144ZMichael Hhttps://www.analyticbridge.datasciencecentral.com/profile/MichaelHartye
<p>Has anyone used or have thoughts on using a 2-step hurdle model to address the imbalance of "GOODS" vs "BADS" often present in a sample of borrowers?</p>
<p>That is, first run a logistic regression on your Good vs Bad, then take all of your Bads and use the % paid on the loan as the dependent variable and run a separate linear regression. In the Linear, those who defaulted after 3 months would fair worst that those who nearly paid off completely.</p>
<p>Finally combine outcomes of the two…</p>
<p>Has anyone used or have thoughts on using a 2-step hurdle model to address the imbalance of "GOODS" vs "BADS" often present in a sample of borrowers?</p>
<p>That is, first run a logistic regression on your Good vs Bad, then take all of your Bads and use the % paid on the loan as the dependent variable and run a separate linear regression. In the Linear, those who defaulted after 3 months would fair worst that those who nearly paid off completely.</p>
<p>Finally combine outcomes of the two models to create a scorecard.</p>
<p>Any thoughts?</p>
<p></p>
<p>Thanks,</p>
<p>Mike</p> CrowdANALYTIX Contest: Predicting Wine Qualitytag:www.analyticbridge.datasciencecentral.com,2011-05-25:2004291:Topic:1051632011-05-25T02:23:13.481ZChristopher Boundhttps://www.analyticbridge.datasciencecentral.com/profile/ChristopherBound
The CrowdANALYTIX Team is excited to announce the launch of first public contest on our platform. We invite you to come and participate in the contest. You can join the contest here: <a href="http://www.crowdanalytix.com/contests/cheers-predict-wine-quality/" target="_blank">http://www.crowdanalytix.com/contests/cheers-predict-wine-quality/</a><br/> <br/> Everybody is invited to register on the platform and participate in the contest. Join the CrowdANALYTIX Solver Community now!
The CrowdANALYTIX Team is excited to announce the launch of first public contest on our platform. We invite you to come and participate in the contest. You can join the contest here: <a href="http://www.crowdanalytix.com/contests/cheers-predict-wine-quality/" target="_blank">http://www.crowdanalytix.com/contests/cheers-predict-wine-quality/</a><br/> <br/> Everybody is invited to register on the platform and participate in the contest. Join the CrowdANALYTIX Solver Community now! Accessing robustness of a Logistic Modeltag:www.analyticbridge.datasciencecentral.com,2010-08-03:2004291:Topic:754922010-08-03T18:26:59.099ZArunhttps://www.analyticbridge.datasciencecentral.com/profile/Arun
Hi,<br></br><br></br>I've got a Logistic model built for a particular response-non response event.<br></br><br></br>The model suggests statistics that don't look like a robust model. I'm sharing those for more clarification..<br></br><br></br>No. of variables - around 5-8<br></br>c = 0.9<br></br>concordance = 0.93<br></br>H-L Chi square (Goodness of Fit)= 700 (P <<0.0001) (rejects Null - bad model characteristics)<br></br><br></br>Also, a univariate distribution of P(Y=1|X1..Xn) gives me 95% of the probabilities fall within 0.4!!!…
Hi,<br/><br/>I've got a Logistic model built for a particular response-non response event.<br/><br/>The model suggests statistics that don't look like a robust model. I'm sharing those for more clarification..<br/><br/>No. of variables - around 5-8<br/>c = 0.9<br/>concordance = 0.93<br/>H-L Chi square (Goodness of Fit)= 700 (P <<0.0001) (rejects Null - bad model characteristics)<br/><br/>Also, a univariate distribution of P(Y=1|X1..Xn) gives me 95% of the probabilities fall within 0.4!!! Which suggests that the model does poorer than a random!!<br/><br/>What are the ways to improve my model? I know of one or two methods that I surfed through recently, but none hands on.. Would like to hear any advice on this!<br/><br/>Thanks in advance.<br/><br/>Arun<br/> Calculus-level Programming for solving ODEs, PDEs, etc. Learn thru examples. Have math problem, need a solution?tag:www.analyticbridge.datasciencecentral.com,2008-11-07:2004291:Topic:282162008-11-07T17:06:25.142ZPhil B Brubakerhttps://www.analyticbridge.datasciencecentral.com/profile/PhilBBrubaker
(You) Have math problem, need a solution? If so and are willing to learn Calculus (level) Programming, then I'll help you write the code and use my (alpha) version of Fortran Calculus compiler to solve your problem. In exchange, you must tell at least 5 people about:<br></br>
<br />
<div style="margin-left: 2em">o this AnalyticBridge website;<br></br> o Calculus-level Programming; and,<br></br> o Write-up your problem with Calculus Programming code as a <b>discussion</b> for others to learn from here on this…</div>
(You) Have math problem, need a solution? If so and are willing to learn Calculus (level) Programming, then I'll help you write the code and use my (alpha) version of Fortran Calculus compiler to solve your problem. In exchange, you must tell at least 5 people about:<br/>
<br />
<div style="margin-left: 2em">o this AnalyticBridge website;<br/> o Calculus-level Programming; and,<br/>
o Write-up your problem with Calculus Programming code as a <b>discussion</b> for others to learn from here on this website.</div>
<br />
<div style="margin-left: 2em"><b>Major benefits</b> from Calculus Programming are: <br/> o Determines Optimal solution<br/> o Allows Rapid Model Prototyping<br/>
o Accelerates Problem "Understanding"<br/>
o Reduces Time & Costly Problem / Solution Cycle</div>
<br />
<p>Tweaking 1000s of parameters at once is possible with Calculus programming. Math models can be algebraic, ODEs, PDEs, constrained, implicit, nonlinear, nested, etc. It solves them all with built in numerical methods. Leave the work to Calculus-level compilers. Users work on improving their math model and output displays (i.e. plots) and that's all. Nice and short. Try Calculus Programming, you'll love it!</p>
<br />
<p>Visit <a href="http://www.digitalCalculus.com/example/intro.html" target="_blank">digitalCalculus.com examples</a> for industry problem write-ups.</p>
<br />
<p>Thanks,<br/> Phil</p> Spatial ETL Pros Needed for Leader in Geographic Business Intelligence Solutionstag:www.analyticbridge.datasciencecentral.com,2008-02-23:2004291:Topic:22232008-02-23T00:00:56.265ZMatt Moylanhttps://www.analyticbridge.datasciencecentral.com/profile/MattMoylan
Looking for talent in the Geospatial ETL realm. Immediate opportunities in Western US for:<br />
<b>1) Account Managers</b> (mostly project management, no hard sales)<br />
<b>2) Professional Services</b> (architecting client software customizations)<br />
<b>3) GIS and Business Intelligence Web Developers</b> (Data driven web app design)<br />
<b>4) Senior Sales Consultants</b> (Multiple locations and verticals)<br />
<br />
Always looking for great people. Feel free to <a href="mailto:mmoylan@emplicity.com">contact me</a>
Looking for talent in the Geospatial ETL realm. Immediate opportunities in Western US for:<br />
<b>1) Account Managers</b> (mostly project management, no hard sales)<br />
<b>2) Professional Services</b> (architecting client software customizations)<br />
<b>3) GIS and Business Intelligence Web Developers</b> (Data driven web app design)<br />
<b>4) Senior Sales Consultants</b> (Multiple locations and verticals)<br />
<br />
Always looking for great people. Feel free to <a href="mailto:mmoylan@emplicity.com">contact me</a>