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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. High coefficients and intercept

    Hello fellow forum-ers, Hoping someone can provide some insight into a regression issue I am dealing with. I am using Excel and trying to...

    Started by derek.canada‎, 10-17-2012 11:51 AM
    • Replies: 5
    • Views: 2,027
    10-17-2012, 01:05 PM Go to last post
  2. Exclamation Regression Analysis - Transformations and Non-Normality

    Hello, I am fairly new to regression analysis and have a few questions.. I have a fairly large dataset containing information about 144...

    Started by larrikinlover‎, 10-17-2012 09:23 AM
    glm, normality, regression, transformations
    • Replies: 2
    • Views: 996
    10-17-2012, 10:13 AM Go to last post
  3. Quick question on Fixed / Random effects

    Hi all, Can someone please let me know if Fixed Effects / Random Effects (by introducing dummies) can be applied to a regression WITHOUT using...

    Started by lucas111‎, 10-16-2012 03:41 AM
    • Replies: 4
    • Views: 1,667
    10-17-2012, 03:29 AM Go to last post
  4. What regression model should I use?

    I am currently a student and haven't taken statistics in a long time, so keep that in mind! 1) I am unsure if my dependent variable is...

    Started by Klea‎, 10-16-2012 07:24 PM
    logit, regression
    • Replies: 1
    • Views: 992
    10-16-2012, 08:25 PM Go to last post
  5. Average trendline for multiple trendlines plus standard deviations

    I have data and linear trendlines for 10 subjects. So I have 10 slopes and 10 y-intercepts. If I wanted to plot the average and +/- st deviation...

    Started by ivoryowl‎, 10-16-2012 07:01 PM
    multiple trendlines
    • Replies: 0
    • Views: 1,601
    10-16-2012, 07:01 PM Go to last post
  6. Projecting Data - what is the right analysis to use?

    I am in healthcare. I have a report have is providing me a unit of service on a daily basis going back three months. What I would like to do is...

    Started by psrs0810‎, 10-15-2012 08:05 AM
    • Replies: 6
    • Views: 1,833
    10-16-2012, 02:11 PM Go to last post
  7. Panel Data: Logistic fixed-effect model with a non-varying dependent variable...

    Dear all, As a part of my masterís thesis, I am currently undertaking some statistical analysis of corporate turnaround. I have a panel dataset...

    Started by avh‎, 10-16-2012 09:38 AM
    • Replies: 0
    • Views: 2,199
    10-16-2012, 09:38 AM Go to last post
  8. Issue with missing data

    Hi all, I am working on a dataset that include 12K+ firm-level data for 30+ countries. I have both firm-level variables (each firm within country...

    Started by lucas111‎, 10-10-2012 09:27 AM
    missing data
    • Replies: 4
    • Views: 1,914
    10-16-2012, 05:55 AM Go to last post
  9. Logistic regression (panels issue - time variable)

    Actually, each individual is unique so panels do not apply here! individual country year Y X1 X2 X3 1 1 2000 6.0 7.8 5.8 1.3...

    Started by lucas111‎, 10-11-2012 12:22 AM
    • Replies: 2
    • Views: 1,561
    10-16-2012, 03:43 AM Go to last post
  10. Panels - Can I use on my dataset?

    Hi all, Can anyone please tell me if PANELS can be used on my dataset (plan to use logistic regression as Y=1/0)? Each "firm" is a unique entry...

    Started by lucas111‎, 10-16-2012 03:01 AM
    • Replies: 0
    • Views: 1,221
    10-16-2012, 03:01 AM Go to last post
  11. F test and t-test

    Hi guys, I am analyzing some regression results and the p-value for the F-test is large, but at the same time, the t-test for some of the independent...

    Started by boredaxel‎, 10-14-2012 12:20 AM
    • Replies: 2
    • Views: 1,534
    10-15-2012, 09:03 AM Go to last post
  12. f-test, regression to polynomial

    Hi, I am in over my head and could use some guidance. For an assignment, I have divided the data into two classes (arbitrary) and used only one to...

    Started by JillthePill‎, 10-13-2012 06:27 PM
    • Replies: 0
    • Views: 1,549
    10-13-2012, 06:27 PM Go to last post
  13. Simple NLLS algorithm

    Hi, I am having trouble implementing the most basic NLLS algorithm. I am following the example from here to every detail, yet my implementation...

    Started by sigma‎, 10-13-2012 10:04 AM
    • Replies: 0
    • Views: 1,427
    10-13-2012, 10:04 AM Go to last post
  14. GLM: possible to constrain 1 beta weight?

    Hi, I am interested in comparing two design matrices in which the parameter values of interest are perfectly negatively correlated. Of course, via...

    Started by kurtio‎, 10-06-2012 02:21 PM
    constrained regression, glm
    • Replies: 3
    • Views: 2,061
    10-12-2012, 08:14 PM Go to last post
  15. Question on Finding the Least Squares Estimate (Under Certain Conditions)

    The answer to b(-i.) is easy to find (i.e. when the ith observation is omitted). It is just the answer to the least squares estimate of b for the...

    Started by chrishello‎, 10-08-2012 01:27 AM
    • Replies: 1
    • Views: 1,406
    10-12-2012, 06:08 AM Go to last post
  16. Interpretation of Significant Interaction Term

    In logistic regression, I have a b= -.252 and an odds ratio =.778 for an interaction term I have included in my model. One variable is continuous and...

    Started by sociology‎, 10-09-2012 01:34 PM
    • Replies: 1
    • Views: 1,373
    10-12-2012, 05:16 AM Go to last post
  17. Using multiple similar variables

    Hi. I'm trying to determine the dependent variables for a variable I'd like to predict, namely, how much time it takes someone to deliver a product...

    Started by todan‎, 10-11-2012 03:54 AM
    • Replies: 1
    • Views: 1,193
    10-12-2012, 05:12 AM Go to last post
  18. Drop in deviance question

    Hello, I'm trying to look at the significance of a covariate through a drop in deviance test of two Poisson models. For example, mod1 might have...

    Started by kirkby‎, 10-09-2012 05:49 PM
    • Replies: 0
    • Views: 2,355
    10-09-2012, 05:49 PM Go to last post
  19. First differences

    Hi, I am trying to find a mathmetical relationship between the economic growth, poulation and the number of cars in a specific area where the no....

    Started by rajaa1510‎, 10-08-2012 11:26 AM
    • Replies: 2
    • Views: 1,339
    10-09-2012, 02:11 PM Go to last post
  20. Help! can't get normal residual, what should I do?

    Dear All, I am working on a project, and trying to explain what factors will affect the price of a product, here LOG10(PRICE) is the DV, and a few...

    Started by fcong‎, 10-05-2012 03:54 AM
    • Replies: 6
    • Views: 2,662
    10-09-2012, 12:56 AM Go to last post
  21. Question Vote Fraud in Iowa??? Tell me how this is statistically possible please!

    NOTE: UPDATED, PLEASE SEE MY COMMENT #26 ON PAGE TWO. Ok... Please be easy on me... One, I'm new here. Two, it has been a long time...

    Started by presence‎, 02-21-2012 10:10 PM
    2 Pages
    1 2
    • Replies: 27
    • Views: 6,213
    10-08-2012, 01:53 PM Go to last post
  22. A methodology question

    Hi, I have a multiple regression model e.g. y=x1+x2+e Can I estimate the model by using the model in two ways by using same values of y and x1,...

    Started by taltalk‎, 10-05-2012 12:19 PM
    • Replies: 3
    • Views: 946
    10-05-2012, 03:06 PM Go to last post
  23. Simultaneous Linear Regressions

    Hello all. I am looking over another student's dissertation and came across something I have no prior knowledge of. The analysis statement says: ...

    Started by krytellan‎, 10-05-2012 09:54 AM
    • Replies: 2
    • Views: 1,158
    10-05-2012, 10:49 AM Go to last post
  24. Deriving Multiple Regression Line

    How do I derive the multiple regression line y=a+b1x1+b2w2 using method of least squares not matrix? I know I need to set ds/da=0, ds/b1=0 and...

    Started by marleygrace‎, 10-05-2012 03:10 AM
    • Replies: 2
    • Views: 1,602
    10-05-2012, 10:03 AM Go to last post
  25. Types of RESET test

    Hi, I am using R (well, R commander) to run multiple regression on a data set. I've been checking the linearity assumption using the RESET test. I...

    Started by gibb‎, 10-04-2012 11:36 AM
    • Replies: 1
    • Views: 1,657
    10-04-2012, 01:51 PM Go to last post
  26. Mediation regression

    Hi all, I have a question regarding an analysis I just ran. I ran a mediation analysis using a bootstrap approach (requiring me to look at the...

    Started by acue‎, 06-30-2012 05:44 PM
    • Replies: 3
    • Views: 2,061
    10-04-2012, 03:54 AM Go to last post
  27. Odds ratios in hierarchical linear modelling

    Hi, I am currently running a model which tests differences between the success rate for males and females in passing a test. In this model...

    Started by ifacto‎, 10-04-2012 02:09 AM
    logistic regression, odds ratios, regression analysis
    • Replies: 1
    • Views: 1,182
    10-04-2012, 02:24 AM Go to last post
  28. Logistic Regression (time series + cross-section)

    Hi all, I am trying to run a logistic regression and would really appreciate any help. I have a list of company (with a binary dependent var....

    Started by lucas111‎, 10-03-2012 10:52 PM
    logistic regression, panels, stata
    • Replies: 0
    • Views: 1,601
    10-03-2012, 10:52 PM Go to last post
  29. Why is there perfect multicollinearity in this regression?

    Hi Everybody, I will simplify my problem to make this all more clear. Suppose I have three countries (1, 2 and 3) and I have data on migration...

    Started by Salohcin‎, 10-03-2012 03:58 PM
    • Replies: 4
    • Views: 2,849
    10-03-2012, 05:02 PM Go to last post
  30. Calculating deviance residuals and dispersion for a count model

    Hello, Iím working with a poisson model to look at relationships between fish and habitat. I have multiple-pass count data (the same pool...

    Started by kirkby‎, 09-24-2012 10:19 AM
    deviance, dispersion, quasi-poisson
    • Replies: 2
    • Views: 6,321
    10-02-2012, 07:42 PM Go to last post
  31. Combining multiple covariates in a linear regression model

    Hi all, My question pertains to the handling of covariates in a regression analysis. Consider for example that I have three covariates (c1, c2 and...

    Started by tnknox‎, 10-02-2012 06:01 PM
    • Replies: 0
    • Views: 1,311
    10-02-2012, 06:01 PM Go to last post
  32. OLS linear regression with multiple independent variables

    I need to find the most significant variable. Should I run a multiple regression or multiple times singly? Anyway I ran multiple regression and...

    Started by sciconf‎, 10-02-2012 02:00 PM
    • Replies: 2
    • Views: 1,077
    10-02-2012, 03:53 PM Go to last post
  33. Common Factor Restrictions

    Hello, I am currently writing my Master-Thesis and got a problem, which I have been trying to solve for the last three days. I have to conduct a...

    Started by Canu‎, 10-02-2012 03:19 AM
    • Replies: 0
    • Views: 2,457
    10-02-2012, 03:19 AM Go to last post
  34. How to assess Goodness-of-fit

    I have fitted a set of data points to an exponential decay curve of the equation: y=A+Be^(-t). I wish to assess the quality of fit. Is it OK if...

    Started by dr_rk‎, 09-28-2012 03:45 AM
    chi-squared, goodness of fit, non-linear regression
    • Replies: 5
    • Views: 2,022
    09-30-2012, 11:48 AM Go to last post
  35. Problems with R^2

    Hi, I have an assignment in which measurements of 5 independent variables were measured for 1 dependent variable. The first questions asks which of...

    Started by gibb‎, 09-28-2012 10:13 AM
    • Replies: 8
    • Views: 2,427
    09-29-2012, 01:59 PM Go to last post
  36. confused trying to understand my SAS logistic regression output

    I am working on a public health masters thesis and need help trying to understand my SAS logistic regression output. I have a dataset of HIV cases...

    Started by greg30043‎, 09-27-2012 03:31 PM
    • Replies: 3
    • Views: 3,321
    09-28-2012, 05:09 PM Go to last post
  37. ANCOVA with 4 IV's and 1 DV. Which IV is the moderator?

    Hi! My experiment is a Between-subjects factorial design. I used two scenario's. I want to perform a factorial ANOVA analysis with 4 IV's and 1...

    Started by Nadia1908‎, 09-27-2012 04:29 AM
    • Replies: 0
    • Views: 1,942
    09-27-2012, 04:29 AM Go to last post
  38. Multicollinearity and the 'backward' regression method

    Hello, Simple question - Am I right is assuming that you cannot use backwards,forwards or best subsets regression techniques if you have two...

    Started by bradyj2‎, 09-26-2012 09:56 AM
    • Replies: 6
    • Views: 2,787
    09-26-2012, 12:22 PM Go to last post
  39. Multiple Time Series Regression? Time Series with multiple independent variables

    I've asked a lot about time series in general but perhaps I should be focusing my questions about this: is it possible to do a time series...

    Started by lancearmstrong1313‎, 08-23-2012 12:37 PM
    • Replies: 5
    • Views: 20,466
    09-26-2012, 09:03 AM Go to last post
  40. Linear regression and SEM cross talk

    If just started analysing data I got from around 250 questionnaires. I've built a model in AMOS but I can't get it to match what is going on with my...

    Started by loops22‎, 09-25-2012 04:41 AM
    • Replies: 0
    • Views: 1,766
    09-25-2012, 04:41 AM Go to last post
  41. Regression where variables cannot be below a certain value

    Hello, to quickly describe my general situation, I am trying to model total cost based on certain services used in a hospital. So for example, I want...

    Started by lancearmstrong1313‎, 09-24-2012 02:26 PM
    • Replies: 5
    • Views: 1,676
    09-24-2012, 03:01 PM Go to last post
  42. Lightbulb How to define partial support

    I have 6 statistical tests which make up one hypothesis - one is significant, can I say that the hypotheses has partial support?

    Started by richieboy‎, 09-19-2012 11:54 AM
    • Replies: 4
    • Views: 2,356
    09-22-2012, 10:33 AM Go to last post
  43. Help with multiple regression

    Hi there, I am currently doing my undergraduate thesis for finance in the topic of mergers and acquisitions. I am regressing the dependent...

    Started by herman‎, 09-21-2012 05:16 PM
    • Replies: 1
    • Views: 1,437
    09-21-2012, 11:12 PM Go to last post
  44. Interpretation of beta coefficients

    Hi All, In multiple regression, what is it called when a positive significant relationship between a predictor variable and the outcome variable...

    Started by sociology‎, 09-21-2012 12:05 PM
    • Replies: 2
    • Views: 2,247
    09-21-2012, 12:17 PM Go to last post
  45. regression interpretation

    Which results will I use to determine the difference in males and females when all other predictors are held constant. I have 4 predictors (status,...

    Started by Snowy88‎, 09-20-2012 11:54 AM
    • Replies: 1
    • Views: 1,518
    09-20-2012, 12:35 PM Go to last post
  46. Effect size in multiple regression

    Hello, I'm using this this calculator to determine a rough sample size for a multiple regression (20 predictors). ...

    Started by bradyj2‎, 09-20-2012 08:53 AM
    • Replies: 5
    • Views: 6,650
    09-20-2012, 11:30 AM Go to last post
  47. Post Reporting Logistic Regression in APA 6th Ed.

    Hello. I am trying to write up logistic regression with two predictors (one entered in step 1, and one entered in step 2) and then the interaction...

    Started by bakul‎, 09-20-2012 01:56 AM
    apa 6th ed., logistic regression, reporting statistics, write ups
    • Replies: 1
    • Views: 11,116
    09-20-2012, 04:58 AM Go to last post
  48. Constant of 1: Why?

    I know that in regression (well any linear model I would assume; correct this if I'm wrong) models there's a constant of 1 added to the model. I've...

    Started by trinker‎, 09-19-2012 08:26 AM
    constant, regression
    • Replies: 7
    • Views: 3,039
    09-19-2012, 12:19 PM Go to last post
  49. Unhappy Having problems with CATREG for big and small data sets and defining scaling level.

    0 down vote favorite I am facing with an interesting problem here. I have a data set containing mixed nature of independent variables (some are...

    Started by Blain Waan‎, 09-19-2012 08:00 AM
    • Replies: 0
    • Views: 1,764
    09-19-2012, 08:00 AM Go to last post
  50. Question on Finding the Design Matrix

    For the above question, I was wondering if someone could help me find the design amtrix in question a) It seems like from the question tat there...

    Started by chrishello‎, 09-18-2012 08:05 AM
    • Replies: 9
    • Views: 3,564
    09-18-2012, 10:49 AM Go to last post
  51. Relative weights (people's thoughts)

    I recently came across a paper and an R function to calculate relative weights. When I do Hierarchical block-wise multiple regression I'm always...

    Started by trinker‎, 09-17-2012 07:43 PM
    • Replies: 1
    • Views: 5,872
    09-17-2012, 09:53 PM Go to last post
  52. Predict variation

    Hi, could please help me figure out how to find this on stata? How much of the variation for y is explained by x? Is the value of x a good...

    Started by Juan Lopez‎, 09-17-2012 12:51 PM
    • Replies: 1
    • Views: 2,838
    09-17-2012, 02:24 PM Go to last post
  53. Time Series - Differencing the data

    I'm still trying to teach myself time series and have a bunch of questions about differencing the data. I would be super appreciative if anyone could...

    Started by lancearmstrong1313‎, 08-20-2012 01:32 PM
    • Replies: 9
    • Views: 9,265
    09-17-2012, 12:46 PM Go to last post
  54. Evaluating Regression model output with Rsquare

    Please can u comment? I have built a non-linear regression model with 20 independent variables. On a test data, I compared the predicted target...

    Started by viktus‎, 09-06-2012 03:52 PM
    • Replies: 1
    • Views: 2,861
    09-17-2012, 11:24 AM Go to last post
  55. Multiple Regression Analysis Issue

    Hi everyone I have just signed up! I am currently doing a thesis & struggling with my regression model. I am examining the link between profit...

    Started by 1114368@rgu.ac.uk‎, 09-10-2012 04:09 PM
    dummy variable, help needed, hypothesis testing, multiple regression, problem
    • Replies: 6
    • Views: 2,793
    09-17-2012, 12:54 AM Go to last post
  56. Conditional expectation and consistent estimation

    Could someone explain the following statement: are consistently estimable on the support of (x,z) if either: 1. (x,z) are discrete or, 2. are...

    Started by mmgg‎, 09-16-2012 01:06 PM
    • Replies: 2
    • Views: 1,093
    09-16-2012, 04:00 PM Go to last post
  57. Repeated measures regression models in R using nlme (linear) and lme4 (logistic)

    Hello, So, I'm still working on my thesis model, which I asked questions about last week or so. I went to stats help at my university, and have...

    Started by jeskill‎, 09-16-2012 03:04 PM
    • Replies: 0
    • Views: 4,384
    09-16-2012, 03:04 PM Go to last post
  58. Question External Validation

    Hi to all This is probably a stupid question but I do not know how to solve this problem: through multivariate analysis of a sample of patients I...

    Started by vader90‎, 09-16-2012 05:10 AM
    • Replies: 1
    • Views: 1,284
    09-16-2012, 10:47 AM Go to last post
  59. Esimating detector response from Calculated and Measured values

    Hello all, I have a dataset of soil concentration of a mineral Measured and Calculated. Calculted values are concentration calculated in lab and...

    Started by swagathnavin‎, 09-14-2012 05:37 PM
    • Replies: 1
    • Views: 1,211
    09-16-2012, 12:57 AM Go to last post
  60. Derivation of Distribution of Sum of Matrices in Quadratic Form

    I'm having a bit of trouble starting this question. Is it right for me to assume that the sum of the Ai matrices (A1 + A2 + ... up to k) is an...

    Started by chrishello‎, 09-15-2012 02:30 AM
    • Replies: 3
    • Views: 1,633
    09-16-2012, 12:34 AM Go to last post

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