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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Regressing survey data with independent variables and external data as dependent

    I have an SPSS file with longitudinal data, stretching back 18 months or so (monthly survey with around n=1000), so the survey month is one of the...

    Started by Thomster‎, 04-16-2012 09:18 PM
    • Replies: 0
    • Views: 1,588
    04-16-2012, 09:18 PM Go to last post
  2. Panel Data Regression with Few Observations

    Hello! I know very little of statistics but I need help to do my thesis. I'm running a regression with fixed and random effects in a panel data of 5...

    Started by Argen‎, 04-16-2012 05:57 PM
    panel data, stata
    • Replies: 0
    • Views: 2,464
    04-16-2012, 05:57 PM Go to last post
  3. Panel data regression time fixed & firm fixed

    Hi all, After desparately searching the web and the library I hope one of you will be able to help me with my spss (no 19) problem. My data set...

    Started by BaselII‎, 04-15-2012 02:29 AM
    • Replies: 0
    • Views: 1,446
    04-15-2012, 02:29 AM Go to last post
  4. When Logistic Regression Coefficient Increases

    Hi All, I am trying to understand the relationship between naturalization (whether someone becomes a naturalized citizen or not), using data from...

    Started by Nao‎, 04-12-2012 02:04 PM
    • Replies: 1
    • Views: 1,880
    04-12-2012, 02:17 PM Go to last post
  5. Logistic regression significant interaction with categorical predictor

    Hello everyone, I am doing a binary logistic regression and a have some questions about presenting my data. Depedent variable: Extensive rot...

    Started by lken‎, 04-11-2012 05:10 PM
    • Replies: 0
    • Views: 1,449
    04-11-2012, 05:10 PM Go to last post
  6. disputing a fixed effects model assumption

    Hi guys, I'm in the middle of responding to a reviewer's claim on fixed effects models and wanted to reach out to see if any of you had any...

    Started by Link‎, 04-11-2012 12:29 PM
    • Replies: 0
    • Views: 1,197
    04-11-2012, 12:29 PM Go to last post
  7. multiple timeseries in regression ?

    Hi, has anyone ever done multiple time series in a regression model.. So for example if I have 3 different regions (Prov) each with 10 sub-regions...

    Started by podarum‎, 04-11-2012 09:30 AM
    • Replies: 0
    • Views: 1,243
    04-11-2012, 09:30 AM Go to last post
  8. Pooled OLS

    I've got a question concerning a regression analysis which I'm about to perform. The dataset contains pupils from six different years in a...

    Started by grandpa‎, 04-11-2012 03:49 AM
    • Replies: 0
    • Views: 3,115
    04-11-2012, 03:49 AM Go to last post
  9. How to do a industry comparison?

    Hello everyone, I am really new to statistical analysis and Stata so I might have a question which could sound too dumb, but I still hope that...

    Started by kotorichan‎, 04-10-2012 03:57 PM
    dummy variable, industry, multivariate regression
    • Replies: 1
    • Views: 1,347
    04-10-2012, 04:44 PM Go to last post
  10. Worrying results of F/Wald test in panel data regressions - please help

    Hi All, I am running regression on panel data with 6 time periods and around 160 countries. I have been trying different combinations, but get...

    Started by SylviaS‎, 04-09-2012 07:40 AM
    • Replies: 1
    • Views: 1,622
    04-09-2012, 07:43 AM Go to last post
  11. LinReg Assumption on errors ConfIV

    Hi all why is it assumed that the errors e_i are normal distributed in linear regression, see e.g. Seber. What would be the influence e.g. on...

    Started by Jacov‎, 04-07-2012 05:03 AM
    • Replies: 4
    • Views: 1,784
    04-09-2012, 05:17 AM Go to last post
  12. 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: 9,270
    04-08-2012, 01:45 AM Go to last post
  13. Multilevel model of school data

    Hi, I have a model I am working with to estimate 6 grade test scores from a sample of students who were in a school district from K-6. I am using...

    Started by lchisesi‎, 03-18-2012 11:17 PM
    independence, multi-level data
    • Replies: 4
    • Views: 1,457
    04-06-2012, 07:17 PM Go to last post
  14. 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: 5,781
    04-05-2012, 03:57 AM Go to last post
  15. 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: 3,496
    04-04-2012, 04:03 PM Go to last post
  16. 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: 6,177
    04-04-2012, 01:12 PM Go to last post
  17. 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: 2,188
    04-04-2012, 11:09 AM Go to last post
  18. 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: 23,186
    04-04-2012, 05:36 AM Go to last post
  19. 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: 2,076
    04-04-2012, 03:27 AM Go to last post
  20. 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: 2,084
    04-03-2012, 06:25 AM Go to last post
  21. 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: 1,739
    04-02-2012, 01:58 PM Go to last post
  22. 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: 1,502
    04-02-2012, 10:00 AM Go to last post
  23. 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: 1,567
    04-02-2012, 05:10 AM Go to last post
  24. 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: 15,850
    04-01-2012, 02:13 PM Go to last post
  25. 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: 2,781
    03-31-2012, 08:30 PM Go to last post
  26. 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: 2,695
    03-31-2012, 10:22 AM Go to last post
  27. 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: 1,151
    03-31-2012, 12:39 AM Go to last post
  28. 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: 2,520
    03-30-2012, 02:46 PM Go to last post
  29. 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: 2,950
    03-29-2012, 07:11 PM Go to last post
  30. 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: 1,568
    03-29-2012, 12:05 PM Go to last post
  31. (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: 1,714
    03-29-2012, 09:34 AM Go to last post
  32. 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: 1,781
    03-29-2012, 07:22 AM Go to last post
  33. 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: 3,792
    03-28-2012, 07:30 PM Go to last post
  34. 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: 1,966
    03-28-2012, 04:20 PM Go to last post
  35. 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: 2,079
    03-28-2012, 04:11 PM Go to last post
  36. 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: 1,107
    03-28-2012, 12:55 AM Go to last post
  37. 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: 1,759
    03-27-2012, 06:44 PM Go to last post
  38. 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: 1,796
    03-26-2012, 06:22 PM Go to last post
  39. 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: 2,702
    03-26-2012, 06:20 PM Go to last post
  40. 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: 14,968
    03-26-2012, 11:15 AM Go to last post
  41. 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: 2,331
    03-26-2012, 10:55 AM Go to last post
  42. 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: 1,245
    03-26-2012, 08:57 AM Go to last post
  43. 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: 932
    03-26-2012, 06:27 AM Go to last post
  44. 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: 4,997
    03-26-2012, 03:42 AM Go to last post
  45. 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: 3,820
    03-25-2012, 01:03 PM Go to last post
  46. 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: 1,138
    03-25-2012, 01:01 PM Go to last post
  47. 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: 1,352
    03-24-2012, 06:45 PM Go to last post
  48. 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: 1,937
    03-24-2012, 05:49 PM Go to last post
  49. 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: 1,852
    03-24-2012, 05:49 PM Go to last post
  50. 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: 2,421
    03-24-2012, 05:19 PM Go to last post
  51. 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: 1,165
    03-24-2012, 10:13 AM Go to last post
  52. 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: 1,522
    03-24-2012, 09:59 AM Go to last post
  53. 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: 1,462
    03-21-2012, 11:29 PM Go to last post
  54. 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: 1,646
    03-21-2012, 12:28 PM Go to last post
  55. 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: 1,150
    03-21-2012, 04:55 AM Go to last post
  56. 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: 4,929
    03-21-2012, 02:13 AM Go to last post
  57. 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: 1,681
    03-20-2012, 02:49 PM Go to last post
  58. 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: 1,731
    03-20-2012, 01:08 PM Go to last post
  59. 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: 1,645
    03-20-2012, 08:57 AM Go to last post
  60. 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: 4,482
    03-20-2012, 07:17 AM Go to last post

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