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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. help with Linear regression with nfl stats please

    Hey guys, just wondering if I could get some help with the best way to use my data. After the challenge system was introduced into the nfl in 1999...

    Started by rbskee‎, 04-08-2011 09:41 AM
    • Replies: 3
    • Views: 4,285
    04-09-2011, 01:19 AM Go to last post
  2. Regression with latent variable

    Hi, I'm doing some research for my dissertation and need to construct a latent variable that includes observations of various economic...

    Started by Swede159‎, 04-15-2011 11:01 AM
    latent variable
    • Replies: 3
    • Views: 6,966
    04-17-2011, 01:11 PM Go to last post
  3. Easy Questions: Simple regression

    Hi, I have three questions for you on which I have issues: Should I use correlation test or simple regression: that "ratio data" is...

    Started by Robjam‎, 04-21-2011 07:55 AM
    • Replies: 3
    • Views: 2,803
    04-21-2011, 03:51 PM Go to last post
  4. Homogeneity of regression slopes

    If assumption of homogeneity of regression slopes broken in ANCOVA analysis, what to do? Can I use linear regression instead? Thanks

    Started by saraf‎, 04-23-2011 07:00 AM
    ancova, homogeneity of slopes
    • Replies: 3
    • Views: 5,896
    04-23-2012, 04:55 AM Go to last post
  5. Find expected value and variance of ARMA(1,1) model

    My apologies if this isn't the correct subforum to ask this question. Here's the model: y_{t}=50+ 0.8y_{t-1} + a_{t} - 0.2a_{t-1} How do I...

    Started by downthesun01‎, 04-25-2011 06:13 PM
    • Replies: 3
    • Views: 13,184
    04-27-2011, 02:11 AM Go to last post
  6. Some help with exam preparation please

    Hi everyone! I'm studying for a stats exam and I am stuck on a few questions. Any help would be appreciated. Here are the coefficients and S.E.s...

    Started by Diane86‎, 05-04-2011 05:10 AM
    • Replies: 3
    • Views: 1,929
    05-06-2011, 12:55 PM Go to last post
  7. Exclamation What type of regression?

    I am trying to determine if there is a relationship between two variables and how strong it is... Each patient has: number of comorbidities and...

    Started by matthewgrayson‎, 05-10-2011 06:55 PM
    • Replies: 3
    • Views: 2,578
    05-11-2011, 09:01 PM Go to last post
  8. Building my 1st model please help!!

    Hi there, First of all please excuse my lack of knowledge of the subject I have just started a course in Econometrics and find using the...

    Started by Drareg‎, 05-07-2011 09:49 AM
    building regression model
    • Replies: 3
    • Views: 2,655
    05-16-2011, 12:07 PM Go to last post
  9. Help Regarding Linear Regression in SPSS (R Square help)

    Hi, this is my situation for a Human Resources research project. I have 100 respondents and 14 questions. All the questions are simple tick...

    Started by vipinkr3‎, 05-09-2011 05:15 AM
    • Replies: 3
    • Views: 6,257
    05-12-2011, 12:58 PM Go to last post
  10. Generalised Least Squares VS Multilevel Modeling...

    hello guys! i've been trying to wrap my head around this question for a while... if i understand things correctly, generalised least squares (GLS) is...

    Started by will22‎, 05-17-2011 04:35 AM
    • Replies: 3
    • Views: 2,982
    05-18-2011, 09:18 PM Go to last post
  11. Interactions and Subgroup-Specific Effects

    Hello, I have a question regarding interaction terms in regression equations. For example, if I want to find out whether there is an interaction...

    Started by trafalgar‎, 05-17-2011 06:24 PM
    • Replies: 3
    • Views: 2,729
    05-18-2011, 09:41 AM Go to last post
  12. Interaction term

    Hi, I'm running linear regressions (1) Y = a + b and (2) Y = a + b + axb The coefficients for a and b in (1) have positive signs which are...

    Started by dou‎, 05-22-2011 10:23 AM
    • Replies: 3
    • Views: 2,995
    05-23-2011, 04:49 AM Go to last post
  13. Large coefficient problem

    Hello, i'm running linear regressions for a large cross country panel data: the simplified term is similar to y = a + b + axb. When I run...

    Started by dou‎, 05-23-2011 04:21 AM
    • Replies: 3
    • Views: 3,025
    05-23-2011, 05:20 AM Go to last post
  14. Sphericity

    Hi! I'm Planning on running a simulation, and one of my conditions I'm varying is whether a set of variables Meet the sphericity assumption in a 1...

    Started by jamesmartinn‎, 06-24-2011 11:40 AM
    • Replies: 3
    • Views: 2,686
    06-24-2011, 11:59 AM Go to last post
  15. Multiple Moderated Regression Help!

    Hi folks, i need help regarding multiple moderated regresison analysis in SPSS. I have one independent variable (X), one Dependent variable (Y)...

    Started by nouman‎, 08-26-2011 02:41 PM
    moderated multiple regres
    • Replies: 3
    • Views: 3,457
    08-27-2011, 09:42 AM Go to last post
  16. Can I compare models like this ?

    Hi, I was trying to fit a linear regression model (simple), for a set of data that shows a very strong linear relation between X and Y. Linearity...

    Started by NN_STAT‎, 07-05-2011 12:53 AM
    • Replies: 3
    • Views: 1,849
    07-05-2011, 01:46 AM Go to last post
  17. Find the affect of introducing a variable into a Data Set

    Good morning, Everyone! I apologize, but I must admit that it's been a few years since I've been engaged in any statistical analysis; that being...

    Started by sapiensgladio‎, 07-11-2011 01:37 PM
    conversion, regression
    • Replies: 3
    • Views: 3,097
    07-11-2011, 08:21 PM Go to last post
  18. A new comer has a question about multicollinearty problem

    I am running a OLS model with 9 IVs. The model results are good (a fitting model), but I got a high negative multicollinearity problem for two IVs...

    Started by TanXi‎, 07-23-2011 09:45 AM
    • Replies: 3
    • Views: 2,400
    08-09-2011, 02:51 PM Go to last post
  19. Power-law relation (Help Please)

    Hi there, I wonder if you can kindly help me with questions below 1) I have data to apply for a power-law relation (A=B*C^D). I am using excel to...

    Started by dara‎, 07-23-2011 04:13 PM
    • Replies: 3
    • Views: 2,201
    07-26-2011, 09:28 PM Go to last post
  20. deviance

    can anybody please tell me why we need to multiply difference of likelyhoods by "-2"? Where this 2 came from, why not 3? Could not find answer

    Started by antonitsin‎, 07-27-2011 02:25 PM
    deviance, glm diagnostocs
    • Replies: 3
    • Views: 2,174
    07-29-2011, 11:24 AM Go to last post
  21. Research Question Regarding Logistic Regression

    Hi all, I am conducting a medical study with n=179 subjects and have something like 30 independent variables that I am comparing to 1 outcome. I...

    Started by DanMed‎, 08-15-2011 02:48 PM
    • Replies: 3
    • Views: 2,777
    08-16-2011, 12:32 PM Go to last post
  22. Help with collinearity

    Hi, I have a collinearity problem with my data. How do I deal with this? the variable which has collinearity is important, so I can't remove it from...

    Started by dinsya‎, 08-11-2011 04:27 PM
    collinearity
    • Replies: 3
    • Views: 2,424
    08-16-2011, 10:40 AM Go to last post
  23. Multiple Linear Regression in Environmental Justice Analysis

    Hi, I have 982 data points (census block groups) for which I have information on % minority and low income, and levels of air pollution. I did MLR...

    Started by aida‎, 08-18-2011 03:09 PM
    • Replies: 3
    • Views: 3,132
    08-18-2011, 04:50 PM Go to last post
  24. Least square estimates

    (y1, x1)...(yn, xn) and (w1,x1),.....(wn,xn) are independent oberservations where x1...xn are fixed constants. Suppose we fit the first model yi = a1...

    Started by Cookie‎, 08-22-2011 02:51 AM
    • Replies: 3
    • Views: 5,223
    08-22-2011, 11:49 PM Go to last post
  25. Logistic Regression

    I am having difficulty performing logistic regression in SPSS due to missing data. Any suggestions for controlling for missing data in logistic...

    Started by ChrisT‎, 09-08-2011 06:51 PM
    • Replies: 3
    • Views: 2,544
    09-11-2011, 08:14 PM Go to last post
  26. Novice needs help with Maximum Likelihood Estimation of Logit Model

    Hi all, Id be grateful for some help. I realise this is perhaps elementary stuff for many but as someone without a formal statistics background, I...

    Started by An Novice‎, 09-16-2011 06:25 AM
    • Replies: 3
    • Views: 3,446
    09-16-2011, 09:21 AM Go to last post
  27. Simple guidance needed (regression & interaction terms) plz

    Hi guys - I've been searching around online for a while and even have a textbook but I'm still confused and require guidance from someone. Running...

    Started by kharmis‎, 09-20-2011 10:27 AM
    • Replies: 3
    • Views: 2,378
    09-21-2011, 12:37 PM Go to last post
  28. The Connection between conditional expectation and unconditional expectation

    William Greene, Econometric Analysis, 7th edition, 20th page: The zero conditional mean implies that the unconditional mean is also zero, since E...

    Started by alexyflemming‎, 09-28-2011 06:51 AM
    • Replies: 3
    • Views: 12,467
    10-02-2011, 02:18 PM Go to last post
  29. GLM Interpretation - confused.com

    Hi Folks, This may seem pretty straight forward to many of you but I'm could really do with some help. I'm using the generalized linear model to...

    Started by railway‎, 10-21-2011 10:00 AM
    • Replies: 3
    • Views: 3,093
    11-01-2011, 09:46 AM Go to last post
  30. Help on a project!!!

    I am doing a school project and trying to find a relationship between government deficit/GDP (dependent variable) and inflation, interest rate,...

    Started by Hao Wang‎, 10-20-2011 12:28 PM
    model, regression, research
    • Replies: 3
    • Views: 1,945
    10-26-2011, 05:51 PM Go to last post
  31. Drawing polynomial out of regression results table of a fixed effects regression

    Dear all, maby its a simple question but I could not find a compelling answer in books or papers: I run a fixed effects regression giving me a...

    Started by balae‎, 10-14-2011 09:29 PM
    • Replies: 3
    • Views: 2,788
    10-15-2011, 04:06 PM Go to last post
  32. Least Square Estimators

    When we only have sample size of 2,can we still calculate the least squares estimators for alpha and beta? ?

    Started by hsian90‎, 10-13-2011 12:23 PM
    • Replies: 3
    • Views: 1,911
    10-13-2011, 06:43 PM Go to last post
  33. Orthogonal projection onto linear span.

    Hi there. I was hoping someone could give me a starting point on this problem because I'm clueless. given y = x1 =

    Started by c2q‎, 10-23-2011 08:45 PM
    • Replies: 3
    • Views: 3,623
    10-24-2011, 12:55 PM Go to last post
  34. Logistic Regression: model selection and interpretation

    Good Day!! Hi I am working for the first time with logistic regressions and I have some doubts about the model selection and the result that is...

    Started by caelrato‎, 11-16-2011 01:03 PM
    • Replies: 3
    • Views: 5,411
    11-16-2011, 03:17 PM Go to last post
  35. Durbin-Watson table

    Hi.. Anyone here know how to determine whether we violated the assumption for durbin watson test... i found the table but the max sample size is...

    Started by psychology_student‎, 11-28-2011 09:17 AM
    • Replies: 3
    • Views: 4,927
    11-29-2011, 11:11 AM Go to last post
  36. Interpreting Interaction Terms

    I am working on a regression analysis problem where we have to see if there is an interaction between two of the independent (X) variables. I run...

    Started by _IT_Not_Stats_‎, 11-29-2011 04:00 PM
    • Replies: 3
    • Views: 1,958
    11-30-2011, 12:26 PM Go to last post
  37. Question about a question

    Thanks for the help!

    Started by lancearmstrong1313‎, 12-02-2011 11:06 PM
    • Replies: 3
    • Views: 2,811
    12-03-2011, 09:59 AM Go to last post
  38. Proportion of positive reponses in a logistic regression

    Hello, When we do a logistic regression to predict a dichotomous variable (yes/no), should there be some minimum proportion of yes to no responses...

    Started by Ravi Kulkarni‎, 12-02-2011 05:23 AM
    logistic regression
    • Replies: 3
    • Views: 2,634
    12-02-2011, 06:30 AM Go to last post
  39. Correlation between reaction time (RT) and accuracy.

    In a two choice task, for each participant, I want to show that the faster is RT, the higher is the probability for incorrect response. Is it...

    Started by Izek‎, 12-24-2011 09:38 AM
    • Replies: 3
    • Views: 4,033
    12-24-2011, 01:23 PM Go to last post
  40. confidence intervals for linear regression

    Hi, newbie here, so please forgive the bad terminology. I started with ten years of historical data. I used Excel to give me a linear trendline and...

    Started by kins80‎, 01-10-2012 04:12 PM
    confidence interval, linear regression, trend analysis
    • Replies: 3
    • Views: 3,578
    01-11-2012, 09:13 PM Go to last post
  41. [SOLVED] Logistic Regression - Confidence Intervals

    Hi I'm running a logistig regression in SPSS 16.0 and have come across the following issue: when testing for different confidence intervals (95%,...

    Started by pcruz‎, 01-09-2012 10:20 AM
    • Replies: 3
    • Views: 2,076
    01-10-2012, 12:27 PM Go to last post
  42. Multiple logistic regression intercept

    Hello guys and gals, I'm having a me***own trying to understand exactly what the intercept of a multiple logistic regression is telling me/ or if...

    Started by drewmac‎, 01-19-2012 12:40 AM
    • Replies: 3
    • Views: 3,351
    03-13-2012, 12:29 AM Go to last post
  43. Question: Time-Series-Cross-Section Data

    My data: Number of units: 290. Number of years: 4. The units are not sampled. Analysis technique I was thinking of doing an ordinary least...

    Started by Phontastik‎, 01-19-2012 07:12 AM
    • Replies: 3
    • Views: 4,088
    01-30-2012, 06:43 AM Go to last post
  44. Logistic Regression: Testing for interaction effects with many covariates

    Hello everyone! As topic states, I am running a logistic regression with quite a lot of independent variables (23). There are a lot more candidate...

    Started by makadiwa‎, 01-20-2012 04:22 AM
    interaction, logit, stata
    • Replies: 3
    • Views: 9,839
    01-20-2012, 01:01 PM Go to last post
  45. Linear model accounting for fixed effects vs. ordered probit

    I originally ran an ordered probit model on an ordinal dependent variable (values 1-12), however in order to account for fixed effects in my analysis...

    Started by ARW90‎, 02-04-2012 10:38 AM
    econometrics, fixed effects, ordered, probit
    • Replies: 3
    • Views: 3,787
    02-05-2012, 01:44 PM Go to last post
  46. Relation between 2 linear regression curves

    Hello Everyone, I'm new here, I'm hoping someone may be able to help me as Im a bit stuck. Its probably so simple but for some reason this problem...

    Started by gypsyeyes‎, 02-07-2012 09:25 PM
    • Replies: 3
    • Views: 1,697
    02-09-2012, 05:35 PM Go to last post
  47. Multiple Regression and Confounding Factors

    I am working on my thesis project which involves analyzing whether a dichotomous independent variable has an effect on a continuous dependent...

    Started by laura77‎, 02-12-2012 06:24 PM
    confounders, multiple regression
    • Replies: 3
    • Views: 10,559
    02-13-2012, 09:45 AM Go to last post
  48. meaningful value for R squared

    Hi, I did a simple linear regression with two variables (X & Y), both scores that were calculated (mean) on the basis of scores for the items of...

    Started by lucn‎, 02-13-2012 04:37 AM
    • Replies: 3
    • Views: 5,273
    02-13-2012, 09:20 AM Go to last post
  49. Comparing regressions

    Hi, I want to conduct a sensitivity analysis on a regression to check if the results are highly influenced by the sample I have. Basically, I want...

    Started by Oritteropus‎, 02-16-2012 11:53 AM
    • Replies: 3
    • Views: 2,207
    02-16-2012, 12:40 PM Go to last post
  50. Question regarding changes in the value of coefficients

    I am not sure how to answer part A of this question. Thank you!

    Started by shle‎, 02-20-2012 12:16 AM
    • Replies: 3
    • Views: 2,250
    02-20-2012, 05:18 AM Go to last post
  51. Help! model comparison in logistic regression

    Dear all, I'm working on a logistic regression and have now obtained two competing models (one computed by hand, the other with "step" in R). In...

    Started by caro‎, 03-15-2012 06:31 AM
    • Replies: 3
    • Views: 3,098
    03-16-2012, 03:17 AM Go to last post
  52. Transforming dependent variable

    I am using a multiple regression with one continuous DV and 9 IVs (mainly categorical and one continuous). My DV, as the mean score on a...

    Started by judith_sw‎, 03-19-2012 08:10 AM
    • Replies: 3
    • Views: 4,908
    03-20-2012, 07:17 AM Go to last post
  53. Is my sample too big ?

    Hello, I have a sample of 20 continuous variables, along with 3 explanatory (2 continuous and 1 dummy). I am trying to run a regression, linear...

    Started by NN_STAT‎, 03-19-2012 01:48 PM
    • Replies: 3
    • Views: 3,012
    03-26-2012, 10:55 AM Go to last post
  54. Poisson data pairwise comparisons valid?

    Hi everyone, I'm a bit confused if what I am doing is valid. I thought I would get your two cents worth. I have done a poisson linear...

    Started by lken‎, 03-29-2012 05:29 PM
    • Replies: 3
    • Views: 2,859
    03-30-2012, 02:46 PM Go to last post
  55. Principal component analysis before regression anallysis

    Hi this is my first post and i've searched for this answer in vain. I have 50 participants in an experiment i conducted and i want to use a...

    Started by jeandaniel‎, 03-30-2012 06:33 PM
    • Replies: 3
    • Views: 2,981
    03-31-2012, 10:22 AM Go to last post
  56. Mallows Cp selection

    I am using the best subsets method in Minitab to select the best parameters for a multiple regression, but I'm a bit confused on Mallows Cp. Some...

    Started by adama‎, 03-31-2012 02:51 PM
    mallows cp, multiple regression, regression
    • Replies: 3
    • Views: 16,673
    04-01-2012, 02:13 PM Go to last post
  57. Is this data acceptable for a multiple regression?

    Hi all, I have data from a community with MIN size (g) MAX size (g) MAX size without neighbours (g), Height (cm) and Area (cm^2). I have this for...

    Started by amandat‎, 04-02-2012 09:56 AM
    • Replies: 3
    • Views: 2,133
    04-02-2012, 01:58 PM Go to last post
  58. Question interpretation Chow test

    Hey, I have run a Chow test, a test to detect a structural break for a specific period. The result of the test is in attachment. I can...

    Started by mathieuv‎, 04-07-2012 04:40 AM
    • Replies: 3
    • Views: 9,976
    04-08-2012, 01:45 AM Go to last post
  59. Help with "nominal" variables and dummy coding

    Hi. First of all, I'm sorry for not writing 100% correct as this is not my everyday language :) My quetion I'm working with linear...

    Started by aleksaah‎, 04-20-2012 10:57 AM
    • Replies: 3
    • Views: 2,851
    04-21-2012, 03:07 AM Go to last post
  60. Logistic regression analysis - Large beta coefficients

    Hi, I have just run a logistic regression analysis on 7 IVs and a dichotomous DV. The IVs are regression-weighted composite scores of Likert scale...

    Started by adrmck17‎, 04-30-2012 09:54 AM
    • Replies: 3
    • Views: 4,521
    05-01-2012, 02:46 AM Go to last post

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