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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. 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: 1,035
    04-25-2012, 09:31 AM Go to last post
  2. 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: 1,382
    04-24-2012, 10:08 AM Go to last post
  3. 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: 2,084
    04-24-2012, 09:29 AM Go to last post
  4. 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: 2,283
    04-23-2012, 03:25 PM Go to last post
  5. 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: 1,329
    04-23-2012, 08:25 AM Go to last post
  6. 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: 5,724
    04-23-2012, 04:55 AM Go to last post
  7. 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: 1,709
    04-21-2012, 03:43 PM Go to last post
  8. 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: 1,478
    04-21-2012, 04:04 AM Go to last post
  9. 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: 2,624
    04-21-2012, 03:07 AM Go to last post
  10. 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: 1,697
    04-20-2012, 08:17 PM Go to last post
  11. 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: 2,003
    04-20-2012, 02:08 PM Go to last post
  12. 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: 1,529
    04-20-2012, 03:10 AM Go to last post
  13. 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: 1,952
    04-20-2012, 02:57 AM Go to last post
  14. 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: 5,265
    04-19-2012, 05:59 AM Go to last post
  15. 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: 2,585
    04-19-2012, 05:19 AM Go to last post
  16. 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: 1,602
    04-18-2012, 04:25 AM Go to last post
  17. 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: 1,455
    04-17-2012, 01:40 PM Go to last post
  18. 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: 4,028
    04-17-2012, 06:23 AM Go to last post
  19. 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: 1,746
    04-16-2012, 09:18 PM Go to last post
  20. 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: 2,682
    04-16-2012, 05:57 PM Go to last post
  21. 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: 1,676
    04-15-2012, 02:29 AM Go to last post
  22. 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: 2,047
    04-12-2012, 02:17 PM Go to last post
  23. 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: 1,582
    04-11-2012, 05:10 PM Go to last post
  24. 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: 1,346
    04-11-2012, 12:29 PM Go to last post
  25. 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: 1,602
    04-11-2012, 09:30 AM Go to last post
  26. 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: 3,418
    04-11-2012, 03:49 AM Go to last post
  27. 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: 1,528
    04-10-2012, 04:44 PM Go to last post
  28. 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: 1,794
    04-09-2012, 07:43 AM Go to last post
  29. 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: 2,081
    04-09-2012, 05:17 AM Go to last post
  30. 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: 9,680
    04-08-2012, 01:45 AM Go to last post
  31. 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: 1,658
    04-06-2012, 07:17 PM Go to last post
  32. 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: 6,068
    04-05-2012, 03:57 AM Go to last post
  33. 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: 3,731
    04-04-2012, 04:03 PM Go to last post
  34. 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: 6,564
    04-04-2012, 01:12 PM Go to last post
  35. 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: 2,471
    04-04-2012, 11:09 AM Go to last post
  36. 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: 23,967
    04-04-2012, 05:36 AM Go to last post
  37. 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: 2,261
    04-04-2012, 03:27 AM Go to last post
  38. 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: 2,284
    04-03-2012, 06:25 AM Go to last post
  39. 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: 1,956
    04-02-2012, 01:58 PM Go to last post
  40. 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: 1,643
    04-02-2012, 10:00 AM Go to last post
  41. 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: 1,797
    04-02-2012, 05:10 AM Go to last post
  42. 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: 16,336
    04-01-2012, 02:13 PM Go to last post
  43. 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: 3,039
    03-31-2012, 08:30 PM Go to last post
  44. 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: 2,879
    03-31-2012, 10:22 AM Go to last post
  45. 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: 1,256
    03-31-2012, 12:39 AM Go to last post
  46. 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: 2,740
    03-30-2012, 02:46 PM Go to last post
  47. 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: 3,281
    03-29-2012, 07:11 PM Go to last post
  48. 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: 1,803
    03-29-2012, 12:05 PM Go to last post
  49. (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: 1,879
    03-29-2012, 09:34 AM Go to last post
  50. 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: 1,967
    03-29-2012, 07:22 AM Go to last post
  51. 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: 4,021
    03-28-2012, 07:30 PM Go to last post
  52. 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: 2,128
    03-28-2012, 04:20 PM Go to last post
  53. 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: 2,327
    03-28-2012, 04:11 PM Go to last post
  54. 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: 1,219
    03-28-2012, 12:55 AM Go to last post
  55. 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: 1,858
    03-27-2012, 06:44 PM Go to last post
  56. 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: 1,964
    03-26-2012, 06:22 PM Go to last post
  57. 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: 2,949
    03-26-2012, 06:20 PM Go to last post
  58. 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: 15,957
    03-26-2012, 11:15 AM Go to last post
  59. 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: 2,725
    03-26-2012, 10:55 AM Go to last post
  60. 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: 1,361
    03-26-2012, 08:57 AM Go to last post

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