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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Incremental poisson/logistic regression

    Is anyone aware of any work on incremental poisson or logistic regression, i.e. where training data arrives one sample at a time, the samples are not...

    Started by targi‎, 04-30-2012 03:14 PM
    • Replies: 0
    • Views: 1,341
    04-30-2012, 03:14 PM Go to last post
  2. Creating an indicator variable of a single observation

    Hello, Could somebody explain the rational for creating a dummy variable for a single observation in a regression analysis. Why would you do it? ...

    Started by bradyj2‎, 04-29-2012 06:26 AM
    • Replies: 0
    • Views: 1,905
    04-29-2012, 06:26 AM Go to last post
  3. Binary logistic regression to analyze Likert Scale questionnaire

    Hi, I am sort of stuck with the following problem concerning logistic regression analysis in my research on the determinants of technology...

    Started by adrmck17‎, 04-28-2012 12:24 PM
    • Replies: 0
    • Views: 3,994
    04-28-2012, 12:24 PM Go to last post
  4. Blinder-Oaxaca Decomposition for a Multivariate Linear Regression

    Hello Everyone, I am working on a thesis that uses a multivariate linear regression to evaluate the racial wealth gap between four groups: whites,...

    Started by Colin‎, 03-16-2012 05:21 PM
    blinder-oaxaca, decomposition, general linear regression, multivariate regression, oaxaca
    • Replies: 1
    • Views: 5,321
    04-28-2012, 11:36 AM Go to last post
  5. F-Test Interpretation and Log-Linear?

    Hey. I have found this a very difficult subject to self-teach and unfortunately I have not found my teachers particularly helpful. Sorry about the...

    Started by Jak‎, 04-16-2012 02:10 PM
    • Replies: 9
    • Views: 4,269
    04-27-2012, 01:40 PM Go to last post
  6. Dummy variable question in regression

    Hello, I'm trying to understand dummy variables in regression. I'm regressing the price of diamonds against (1) weight (2) Clarity and (3)...

    Started by bradyj2‎, 04-24-2012 01:35 PM
    • Replies: 2
    • Views: 2,094
    04-26-2012, 11:26 AM Go to last post
  7. OLS regression versus Binary regression

    Hello, I am currently working on my master thesis and I have a question regarding the use of two types of regressions. First, I will explain the...

    Started by Julien‎, 04-25-2012 11:51 AM
    • Replies: 1
    • Views: 2,007
    04-26-2012, 05:29 AM Go to last post
  8. Imputation Missing Value with Regression

    Hai, i'm new in here. I'm doing my final project now. Actually i'm not in statistics department or something about statistics. I'm in informatics...

    Started by istia‎, 04-24-2012 07:14 AM
    • Replies: 7
    • Views: 1,988
    04-26-2012, 01:35 AM Go to last post
  9. Exclamation Interpretation of coefficient differences across sample groups (please help!?)

    Hello! Before I start the whole story, I am going to sumamrize my main question beforehand so the story will hopefully make more sense. Mainly,...

    Started by Dana‎, 04-25-2012 02:01 PM
    coefficient, interpretation, multiple regression, research, wald
    • Replies: 0
    • Views: 1,960
    04-25-2012, 02:01 PM Go to last post
  10. Weight Matrix in Generalised Linear Models

    Hi, I was wondering if I am trying to do IRLS for GLZ. Is there a way to compute the weight matrix directly for the data I have? I think its...

    Started by mank_bansal‎, 04-25-2012 09:31 AM
    generalised linear models, irls
    • Replies: 0
    • Views: 1,073
    04-25-2012, 09:31 AM Go to last post
  11. multiple linear regression

    hey guys, i want to ask if anyone has came across any statistical test that have attemted to rank independent variables in their other of...

    Started by segunstarr‎, 04-24-2012 10:08 AM
    • Replies: 0
    • Views: 1,438
    04-24-2012, 10:08 AM Go to last post
  12. Really stuck with moderated regression...

    I have used a hierarchical regression analysis in SPSS, however the analysis isn't producing any significant interactions :confused: The...

    Started by Psychx‎, 04-24-2012 08:08 AM
    • Replies: 4
    • Views: 2,373
    04-24-2012, 09:29 AM Go to last post
  13. T-test for 2 slopes

    Is there a t-test that I can use to show that my two slopes are on different planes, or that they are different? ...

    Started by SeatOFpants‎, 04-23-2012 03:25 PM
    • Replies: 0
    • Views: 2,698
    04-23-2012, 03:25 PM Go to last post
  14. Angry Appropriate null hypothesis for a two-stage regression

    Hi thanks everyone for your help in advance. Im working on a two-stage regression, in which a coefficient from the first regression is used as an...

    Started by Daoist‎, 04-23-2012 08:25 AM
    hypothesis testing, multistage, null hypothesis, two stage
    • Replies: 0
    • Views: 1,404
    04-23-2012, 08:25 AM Go to last post
  15. 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: 5,899
    04-23-2012, 04:55 AM Go to last post
  16. Simple minitab result interpretation ?

    I've lost most of my lecture notes and am having trouble recalling the formulae for various results, it would be appreciated if you could please help...

    Started by sid9221‎, 04-21-2012 03:43 PM
    • Replies: 0
    • Views: 1,790
    04-21-2012, 03:43 PM Go to last post
  17. Systematic way of finding all linear relations between given set of variables?

    Hello! I'm a newcomer to statistics and data analysis and I'm currently facing a problem which I don't know how to solve. I have a dataset with...

    Started by Lamazivardi‎, 04-21-2012 04:04 AM
    • Replies: 0
    • Views: 1,537
    04-21-2012, 04:04 AM Go to last post
  18. 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: 2,856
    04-21-2012, 03:07 AM Go to last post
  19. Help me choose a regression model?

    Hi everyone, I have the following problem in mind: Suppose m items are displayed to a user and the user can buy any one of them. Each of the items...

    Started by Comrade‎, 04-20-2012 07:40 PM
    • Replies: 2
    • Views: 1,770
    04-20-2012, 08:17 PM Go to last post
  20. 2-Way ANOVA: Interaction plots show interaction, but term is insignificant?

    Hi, I am doing some 2-way ANOVA analysis and have a slight issue. The interaction plots seem to show there is interaction between the two groups,...

    Started by regression_is_cool‎, 04-20-2012 01:41 PM
    • Replies: 1
    • Views: 2,059
    04-20-2012, 02:08 PM Go to last post
  21. Seemingly Unrelated Regression vs Maximum Likelihood ~ best for constraints?

    I am currently doing research and I am utilizing an almost ideal demand system. It is essentially a regression equation that seeks to model consumer...

    Started by dannylimstata‎, 04-20-2012 03:10 AM
    • Replies: 0
    • Views: 1,628
    04-20-2012, 03:10 AM Go to last post
  22. Exclamation Help! my model isn't predicting any yes outcomes and don't know why

    I am producing a logistical regression analysis to find a model to predict whether someone has minor mental health problems or not. I'm almost...

    Started by el89‎, 04-19-2012 08:58 PM
    help me!, logisitic regression, prediction errors, predictive model, regression analysis
    • Replies: 9
    • Views: 2,036
    04-20-2012, 02:57 AM Go to last post
  23. Combining regression with time series

    Using an existing time series of supermarket sales data I need to make a forecast. Basically a simple exponential smoothing model explains future...

    Started by kenasto‎, 01-20-2011 09:49 PM
    • Replies: 2
    • Views: 5,592
    04-19-2012, 05:59 AM Go to last post
  24. Multiple Regression theory

    Hey guys I'm not too good with the logic of multiple regression so I'd like some enlightenment on the following query. I'm running a multiple...

    Started by durantz‎, 04-03-2012 12:11 AM
    • Replies: 6
    • Views: 2,738
    04-19-2012, 05:19 AM Go to last post
  25. Testing a learning curve

    Hi all, Suppose someone kicks a football at a goal. However, I want to test to see whether or not practice improves technique - whether there is a...

    Started by Leon_1648‎, 04-18-2012 04:25 AM
    learning curve, significance, test
    • Replies: 0
    • Views: 1,676
    04-18-2012, 04:25 AM Go to last post
  26. Log Transform and Nonpositive Values

    I know that some researchers, when taking the log of a variable with some nonpositive values (like wealth), simply replace the nonpositive values...

    Started by tomyris‎, 04-17-2012 01:40 PM
    • Replies: 0
    • Views: 1,529
    04-17-2012, 01:40 PM Go to last post
  27. How to test significance of the mean of multiple OLS regressions (Jensen's Alpha).

    Hi. Im working on a paper on mutual fund performance, using Jensen's Alpha to measure performance. Ri-Rf=a+b(Rm-rf)+ei Time series regression,...

    Started by Vogelius‎, 03-26-2012 08:56 AM
    • Replies: 1
    • Views: 4,199
    04-17-2012, 06:23 AM Go to last post
  28. 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: 1,822
    04-16-2012, 09:18 PM Go to last post
  29. 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: 2,812
    04-16-2012, 05:57 PM Go to last post
  30. 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: 1,882
    04-15-2012, 02:29 AM Go to last post
  31. 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: 2,175
    04-12-2012, 02:17 PM Go to last post
  32. 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: 1,637
    04-11-2012, 05:10 PM Go to last post
  33. 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: 1,438
    04-11-2012, 12:29 PM Go to last post
  34. 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: 2,091
    04-11-2012, 09:30 AM Go to last post
  35. 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: 3,670
    04-11-2012, 03:49 AM Go to last post
  36. 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: 1,626
    04-10-2012, 04:44 PM Go to last post
  37. 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: 1,905
    04-09-2012, 07:43 AM Go to last post
  38. 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: 2,487
    04-09-2012, 05:17 AM Go to last post
  39. 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: 9,982
    04-08-2012, 01:45 AM Go to last post
  40. 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: 1,763
    04-06-2012, 07:17 PM Go to last post
  41. 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: 6,280
    04-05-2012, 03:57 AM Go to last post
  42. 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: 3,894
    04-04-2012, 04:03 PM Go to last post
  43. 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: 6,811
    04-04-2012, 01:12 PM Go to last post
  44. 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: 2,696
    04-04-2012, 11:09 AM Go to last post
  45. 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: 24,602
    04-04-2012, 05:36 AM Go to last post
  46. 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: 2,370
    04-04-2012, 03:27 AM Go to last post
  47. 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: 2,412
    04-03-2012, 06:25 AM Go to last post
  48. 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: 2,137
    04-02-2012, 01:58 PM Go to last post
  49. 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: 1,742
    04-02-2012, 10:00 AM Go to last post
  50. 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: 1,991
    04-02-2012, 05:10 AM Go to last post
  51. 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: 16,685
    04-01-2012, 02:13 PM Go to last post
  52. 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: 3,223
    03-31-2012, 08:30 PM Go to last post
  53. 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: 2,983
    03-31-2012, 10:22 AM Go to last post
  54. 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: 1,330
    03-31-2012, 12:39 AM Go to last post
  55. 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: 2,860
    03-30-2012, 02:46 PM Go to last post
  56. 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: 3,571
    03-29-2012, 07:11 PM Go to last post
  57. 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: 2,079
    03-29-2012, 12:05 PM Go to last post
  58. (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: 1,961
    03-29-2012, 09:34 AM Go to last post
  59. 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: 2,037
    03-29-2012, 07:22 AM Go to last post
  60. 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: 4,175
    03-28-2012, 07:30 PM Go to last post

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