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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Single Negative Beta in Multiple Linear Regression

    Hi everyone I'm having trouble interpreting a single negative regression coefficient in a multiple linear regression. The situation is as follows:...

    Started by lord_yo‎, 04-05-2012 02:56 AM
    • Replies: 1
    • Views: 5,453
    04-05-2012, 03:57 AM Go to last post
  2. Ordered Logit - Probabilities and quadratic term

    Hi everyone, I'm running into a problem interpreting a quadratic (curvilinear) relationship using an ordered logit model. the d.v. is self...

    Started by seandb‎, 04-04-2012 04:03 PM
    • Replies: 0
    • Views: 3,216
    04-04-2012, 04:03 PM Go to last post
  3. Logistic regression convergence issues

    Hi Folks! I'm using logistic regression for classifying records into groups. The issue with logistic regression is that if any cell in the...

    Started by jrai‎, 03-30-2012 12:24 AM
    • Replies: 8
    • Views: 5,727
    04-04-2012, 01:12 PM Go to last post
  4. multivariate ordered probit regression---use standard bivariate normal distribution?

    Hello. My two previous posts (1 & 2) have about 100 views each, but no replies, so I must have done a poor job asking the question. So, here is...

    Started by @nthRo‎, 04-04-2012 12:17 AM
    • Replies: 2
    • Views: 1,941
    04-04-2012, 11:09 AM Go to last post
  5. Moderation in Logistic Regression

    Hi, looking at all the other topics, this is a very basic question, but for me it is really a brain cracker.. I have a conceptual model; ...

    Started by km88‎, 05-25-2011 12:25 PM
    • Replies: 9
    • Views: 22,416
    04-04-2012, 05:36 AM Go to last post
  6. Problems with within subjects regression and dummy variables

    I'm hoping someone will be able to help me with this. I'm trying to replicate some analysis that was done in a published paper to see if I get the...

    Started by Jsr1039‎, 04-04-2012 03:27 AM
    • Replies: 0
    • Views: 1,900
    04-04-2012, 03:27 AM Go to last post
  7. Help with mixed models (spss, time-invariant main predictor, not a growth model)

    I have practically no experience with longitudinal data, and really need your help. I am looking at a sample of firms in a certain industry, and...

    Started by PiciGrici‎, 04-03-2012 06:25 AM
    fixed effects, mixed-model, spss
    • Replies: 0
    • Views: 1,853
    04-03-2012, 06:25 AM Go to last post
  8. 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: 1,543
    04-02-2012, 01:58 PM Go to last post
  9. Assistance on Analysing Likert scale data

    Hi all, I'm looking for some advice on data analysis. I can't see the wood for the trees now at this stage. I'm doing a study of the effect of...

    Started by Robotron6000‎, 04-02-2012 10:00 AM
    • Replies: 0
    • Views: 1,338
    04-02-2012, 10:00 AM Go to last post
  10. Design structure in logistic regression with categorical predictors

    Hi, This is my first post. I am building binary logistic regression models in SAS. Now I had some categorical predictors as well as some...

    Started by Dipanjan‎, 04-02-2012 05:10 AM
    • Replies: 0
    • Views: 1,386
    04-02-2012, 05:10 AM Go to last post
  11. 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: 15,328
    04-01-2012, 02:13 PM Go to last post
  12. simulating bias in fixed-effect dummy regressions

    Earlier today I was typing up a reply to this thread (LINK), but since I don't have a lot of experience with so-called fixed-effects dummy regression...

    Started by Jake‎, 03-31-2012 08:30 PM
    • Replies: 0
    • Views: 2,491
    03-31-2012, 08:30 PM Go to last post
  13. 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: 2,513
    03-31-2012, 10:22 AM Go to last post
  14. Greatest impact prediction

    Hi, please i have one Question. If i have this results (Stepwise method) Can i say: 1) Better for predict Y is model 4 2) Regression...

    Started by zonicek‎, 03-29-2012 04:52 PM
    • Replies: 1
    • Views: 1,043
    03-31-2012, 12:39 AM Go to last post
  15. 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: 2,326
    03-30-2012, 02:46 PM Go to last post
  16. Linear regression vs ancova - when to use which

    Hi all, I have some data on species richness, latitude and temperature. In the past on this sort of data I have used multi-linear regression. But it...

    Started by mikeywillcox‎, 03-29-2012 06:59 PM
    • Replies: 1
    • Views: 2,648
    03-29-2012, 07:11 PM Go to last post
  17. Derivation of the lack of fit sum of suares

    Hi, Can anyone show me step by step how to derive the lack of fit sum of squares, I would be very thankful, I'm so lost in this. Thank you.

    Started by justa18unlv‎, 03-29-2012 11:57 AM
    • Replies: 1
    • Views: 1,378
    03-29-2012, 12:05 PM Go to last post
  18. (Beginner!) Questions about regression on CD album sales/internet use/digital music s

    Hello, I am attempting to perform a regression on what has caused the reduction in CD album sales, and need a little assistance. I have 28 data...

    Started by ontheroadtofindout‎, 03-27-2012 12:07 PM
    • Replies: 1
    • Views: 1,548
    03-29-2012, 09:34 AM Go to last post
  19. When should I report heteroskedasticity robust standard errors?

    With regard to a master's thesis in economics I am working on I am running six regressions (see attachment). I find evidence for heteroskedasticity...

    Started by arnetheman‎, 03-29-2012 07:22 AM
    • Replies: 0
    • Views: 1,603
    03-29-2012, 07:22 AM Go to last post
  20. Comparing curves fitted to two quadratic regressions

    Hello, I have constructed two calibration curves, i.e. plotting known concentrations against response. Both of these sets of data seem to fit a...

    Started by Ri89‎, 03-08-2012 07:19 AM
    curves, quadratic regression
    • Replies: 2
    • Views: 3,556
    03-28-2012, 07:30 PM Go to last post
  21. Which regression should I use?????? HELP

    I have a questionnaire with where respondents were asked if they remember seeing a TV commercial, a radio commercial and a magazine add. “Yes or no...

    Started by Kframnes‎, 03-16-2012 04:51 AM
    • Replies: 2
    • Views: 1,758
    03-28-2012, 04:20 PM Go to last post
  22. Heckman model

    Hi, I'm running a heckman model however some issues have arisen: 1. The log likelihood function is not concave and does not converge after a...

    Started by economix‎, 03-28-2012 04:11 PM
    • Replies: 0
    • Views: 1,820
    03-28-2012, 04:11 PM Go to last post
  23. a question about estimates in mixed models

    Hello, I was hoping to be able to find all of the estimates of covariates and of the categories with a number of factors. I found a similar study...

    Started by Dragonwalker‎, 03-28-2012 12:55 AM
    • Replies: 0
    • Views: 1,027
    03-28-2012, 12:55 AM Go to last post
  24. unrestricted cumulative probit model with vglm()---extend to a multivariate setting?

    Hello. I'm trying to fit a multivariate, unrestricted cumulative probit model. I've had success in fitting a proportional odds probit model using...

    Started by @nthRo‎, 03-27-2012 06:44 PM
    • Replies: 0
    • Views: 1,673
    03-27-2012, 06:44 PM Go to last post
  25. Interaction effect: Do the single variables both need to be significant?

    Dear all, If you have a regression model Y=b0+b1*A+b2*B+b3*A*B, and the dependent variable A and the interaction effect A*B have significant...

    Started by MDT‎, 03-26-2012 04:45 PM
    • Replies: 2
    • Views: 1,648
    03-26-2012, 06:22 PM Go to last post
  26. Determining weighting factors from linear regression

    Hi, I am working on a digital filtering project where I am trying to optimize a filter for a Doppler ultrasound application. Without going in to...

    Started by arefox‎, 03-26-2012 06:20 PM
    • Replies: 0
    • Views: 2,437
    03-26-2012, 06:20 PM Go to last post
  27. 95% confidence intervals for linear regression in excel?

    Hi, I am currently trying to analyse data for my lab experiment and I am having trouble trying to find how to plot individual confidence intervals...

    Started by Paulo1913‎, 03-11-2012 10:42 PM
    • Replies: 1
    • Views: 13,794
    03-26-2012, 11:15 AM Go to last post
  28. 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: 1,968
    03-26-2012, 10:55 AM Go to last post
  29. Significant Effects after Including Interaction Variable (?) :confused:

    Dear all, I hope you could help me with the following: I have tested two regression models, one with inependent variable A, B, C, D, E and one...

    Started by MDT‎, 03-26-2012 08:57 AM
    • Replies: 0
    • Views: 1,126
    03-26-2012, 08:57 AM Go to last post
  30. help appreciated with a validation exercise

    Hello all, I would really appreciate your help with some statistical analysis (yukh! haha!) A psychometric test has been mapped onto a companies...

    Started by mfarskoury‎, 03-26-2012 06:27 AM
    correlation, mapping, regression, validation
    • Replies: 0
    • Views: 844
    03-26-2012, 06:27 AM Go to last post
  31. Cool Regression with non- parametric data....

    Hello! I have conducted the normality test Anderson-Darling on my data, and with a p value of <0,010, I guess that the data are not normal...

    Started by Rebecka‎, 03-24-2012 08:35 AM
    • Replies: 8
    • Views: 4,667
    03-26-2012, 03:42 AM Go to last post
  32. Where in the Regression Output tells me which are the strongest predictor variables?

    Hi, I'm no statitician (yet), but I'm having a go!! - am looking to design an employee survey and analyse the data in Excel. I have watched many...

    Started by cjcass‎, 03-24-2012 07:36 AM
    • Replies: 4
    • Views: 3,509
    03-25-2012, 01:03 PM Go to last post
  33. using a binary response for a mixed model

    Hello, My journey through mixed models (which is documented in past questions) has been an arduous one, however I appreciate being introduced to...

    Started by Dragonwalker‎, 03-25-2012 01:01 PM
    mixed-models binary lme4
    • Replies: 0
    • Views: 1,015
    03-25-2012, 01:01 PM Go to last post
  34. Panel Data (Random or Fixed)

    The r = a +bx. is the model There is data for 3 time periods. Are there fixed effects present? Estimate the parameters a and b. The code below...

    Started by samulleg364‎, 03-24-2012 06:45 PM
    • Replies: 0
    • Views: 1,197
    03-24-2012, 06:45 PM Go to last post
  35. Conditional regression

    Hi all, I am trying to run explanatory regression: Y = alpha + Beta1*X*I{X.*Y>0}+Beta2*X*I{X.*Y<=0} where I{} is indicator function Since...

    Started by JustinasBr‎, 03-24-2012 05:35 PM
    conditional regression, dependent variable on rhs
    • Replies: 2
    • Views: 1,760
    03-24-2012, 05:49 PM Go to last post
  36. Best way to control for weekdays when regressing sales data against time.

    I'm trying to use multiple regression to model sales data per day since Jan 1, 2010. I have established a "time index" to facilitate this. So...

    Started by machinist‎, 03-23-2012 11:21 AM
    • Replies: 2
    • Views: 1,707
    03-24-2012, 05:49 PM Go to last post
  37. Production function CES or Cobb-Douglas

    The data y v1 v2 p w1 w2 is data for the estimation of a production function y = f(v1 ,v2). Is Cobb-Douglas or CES? Estimate the parameters. (p=...

    Started by samulleg364‎, 03-24-2012 05:19 PM
    • Replies: 0
    • Views: 2,215
    03-24-2012, 05:19 PM Go to last post
  38. Random Effects Model and Serial Correlation

    I am working on a model where I am using a random effects model. This might seem like a simple question but does the use of the random effects model...

    Started by ohjosr‎, 03-24-2012 10:13 AM
    • Replies: 0
    • Views: 1,015
    03-24-2012, 10:13 AM Go to last post
  39. p-value of anova when comparing models

    I am asking a new question, however the dataset is related to other questions that I have posted. I am running lmer to determine which factors have...

    Started by Dragonwalker‎, 03-24-2012 09:59 AM
    • Replies: 0
    • Views: 1,338
    03-24-2012, 09:59 AM Go to last post
  40. multiple linear regression rejected - searching for alternative model

    Hey there! I am currently working on a regression model for a logistics problem which includes the transport time as dependent variable and a...

    Started by evident‎, 03-16-2012 09:54 AM
    • Replies: 1
    • Views: 1,313
    03-21-2012, 11:29 PM Go to last post
  41. I think I may finally understand, but a few questions

    Please note that you will find a simplified question below in case you do not have the time to check all of my scripts in the first two posts, but...

    Started by Dragonwalker‎, 03-20-2012 11:18 AM
    mixed-effects aic
    • Replies: 6
    • Views: 1,432
    03-21-2012, 12:28 PM Go to last post
  42. Post which regression analysis model shall i use?

    i am conducting a research on 9 insurance companies from which a 5 year data is collected. Thus, i have to use panel model, but which model fixed...

    Started by asamnew‎, 03-21-2012 04:55 AM
    • Replies: 0
    • Views: 1,024
    03-21-2012, 04:55 AM Go to last post
  43. Interpreting the conclusion of t-test and explaining the p-value

    Hi, I'm working on an assignment which asks me to interpret the conclusion of my t-test regarding the average reading score and the student teacher...

    Started by shle‎, 03-21-2012 02:13 AM
    • Replies: 0
    • Views: 4,583
    03-21-2012, 02:13 AM Go to last post
  44. Regress y on y-hat

    I need some help to prove that when you regress y on y-hat, the least squares regression line is y = y-hat. y = 0 + 1(y-hat). Thanks!

    Started by jwdzurik‎, 03-20-2012 02:49 PM
    • Replies: 0
    • Views: 1,507
    03-20-2012, 02:49 PM Go to last post
  45. Back-calculating correlation coefficient for transformed data

    Hi everyone, This is my first post on this board so please excuse if I sound like a n00b. I am doing a meta-analysis on plant physiology studies,...

    Started by qdread‎, 03-20-2012 01:08 PM
    • Replies: 0
    • Views: 1,567
    03-20-2012, 01:08 PM Go to last post
  46. Plotting

    Is there any way to plot a normal distributions density tilted on its side along the regression line of a simple linear regression. Meaby just 3-5...

    Started by thedreamshaper‎, 03-19-2012 05:14 PM
    • Replies: 2
    • Views: 1,482
    03-20-2012, 08:57 AM Go to last post
  47. 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: 4,214
    03-20-2012, 07:17 AM Go to last post
  48. Mediation question

    If you want to test the hypothesis that the gender difference in brooding will account for the gender difference in anxiety, what would be my...

    Started by pinkk‎, 03-18-2012 10:28 AM
    • Replies: 1
    • Views: 1,051
    03-18-2012, 04:13 PM Go to last post
  49. xtlogit coefficient interpretations

    I'm working on a project where I am using a logit model in the program Stata. I'm using the xtlogit command with panel data for city and years. My...

    Started by ohjosr‎, 03-17-2012 01:46 PM
    • Replies: 0
    • Views: 2,640
    03-17-2012, 01:46 PM Go to last post
  50. Coefficients of delta-lognormal modeling

    I am trying to understand delta-lognormal modeling. Please bear with me. I am applying this method to some fishery data. This method combines...

    Started by elopomorph‎, 06-25-2011 06:27 PM
    delta lognormal
    • Replies: 2
    • Views: 3,264
    03-16-2012, 11:38 AM Go to last post
  51. plotting moderation

    Hi, I know that for most of you this will sound like a stupid question but I am teaching myself regression and I am quite new.. Does it make sense...

    Started by Sciarada‎, 07-02-2011 09:25 PM
    moderation plot, multinomial regression
    • Replies: 1
    • Views: 2,937
    03-16-2012, 09:30 AM Go to last post
  52. 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: 2,423
    03-16-2012, 03:17 AM Go to last post
  53. question on complete confounding and partial confounding in multiple regression

    While learning multiple regression, I once meet the concepts of “complete confounding” and “partial confounding” In the model, the response...

    Started by winecoding‎, 03-15-2012 10:37 PM
    • Replies: 2
    • Views: 4,303
    03-15-2012, 10:49 PM Go to last post
  54. When to address regression diagnostics on residuals?

    Hi, I have some data and have run a regression with all the variables in. I have then run the residual diagnostics but there are some issues. ...

    Started by regression_is_cool‎, 03-11-2012 08:44 AM
    • Replies: 1
    • Views: 1,413
    03-14-2012, 05:08 PM Go to last post
  55. Possible to analyze cross lag panel data with regression alone (no SEM)?

    I have 2 (soon to be 4) waves of panel data. I have a relatively small sample size so I don't think I should use SEM - also I don't really...

    Started by sm34833‎, 03-12-2012 06:21 PM
    panel data, regression, structural equation model
    • Replies: 7
    • Views: 12,341
    03-14-2012, 10:57 AM Go to last post
  56. Help! Deriving a support vector machine

    Given a training set of points not necessarily linearly separable, we have an SVM obtained by minimizing \frac{1}{2}\lambda \left \| \mathbf{w}...

    Started by spidercano‎, 03-13-2012 08:33 PM
    • Replies: 0
    • Views: 1,191
    03-13-2012, 08:33 PM Go to last post
  57. 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: 2,762
    03-13-2012, 12:29 AM Go to last post
  58. Regression with continuous and dummy-coded categorical variables

    Hi everyone, I am trying to figure out differences in the proportions of fallen trees in three ZONES, and nested within ZONES, differences in...

    Started by lken‎, 03-12-2012 06:14 PM
    • Replies: 0
    • Views: 1,704
    03-12-2012, 06:14 PM Go to last post
  59. growth regression results

    I am doing a standard neoclassical growth regression for the European member states for the period 1991-2010. I regress GDP per capita growth on...

    Started by tedylov‎, 03-12-2012 06:02 PM
    • Replies: 0
    • Views: 1,296
    03-12-2012, 06:02 PM Go to last post
  60. 1 predictor, 2 different values for baseline statistic & change statistic?

    Hi, I am conducting a Cox Regression for my first time. I created a simple model with only 1 predictor (categorical), one dependent variable...

    Started by unipsychologist1‎, 03-12-2012 04:09 PM
    change score, chi-sqaured, cox, survival analysis
    • Replies: 0
    • Views: 1,176
    03-12-2012, 04:09 PM Go to last post

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