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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. GLMM random effect conceptualization

    Hello, I have a general question concerning GLMM. I would like to model animal counts as a function of characteristics of the sampling location and...

    Started by filups21‎, 05-14-2012 08:13 AM
    • Replies: 0
    • Views: 1,733
    05-14-2012, 08:13 AM Go to last post
  2. Regression with two categorical predictors and 1 control/covariate?

    Hello, I'm in need of help as these analyses I describe are for my thesis so any input would be greatly appreciated. By the way, I am using IBM...

    Started by acer539‎, 05-13-2012 02:57 PM
    • Replies: 1
    • Views: 2,485
    05-14-2012, 03:04 AM Go to last post
  3. Calculating Cook's Critical Value

    Hey can someone show me how to get F (4,15) (0.5) = 0.8783.

    Started by saternal‎, 05-12-2012 12:43 AM
    • Replies: 7
    • Views: 5,538
    05-12-2012, 01:37 PM Go to last post
  4. find variance of prediction errors for an AR(2) process

    Hi I have attached my question due to my lack of familiarity with latex at the moment. I need to find the variance of the prediction errors,...

    Started by cjones‎, 05-11-2012 05:58 PM
    • Replies: 0
    • Views: 4,875
    05-11-2012, 05:58 PM Go to last post
  5. Insignificant coefficient in one model becomes significant in another model--???

    Aloha, A multiple regression finding is puzzling my adviser and I. Overall goal--to see if caregiver status (dummy, 0/1) and job variables...

    Started by ljcs‎, 04-27-2012 06:26 PM
    • Replies: 3
    • Views: 10,362
    05-10-2012, 07:21 PM Go to last post
  6. Linear R^2 Values as Percent Weights for Multiple Variable Formula?

    Hey guys, Statistics is not my strong suit.. The closest I've been to statistics is a college level Biology II class I took three years ago.. But...

    Started by 7rashcan‎, 05-07-2012 05:20 PM
    multiple regression, percent, r squared, r^2, weights
    • Replies: 1
    • Views: 2,829
    05-10-2012, 06:12 PM Go to last post
  7. Beginner's Question

    Given that you have all the data you need in excel, how fast does it take to derive the equation of the line with it's r2 value? lets say you use...

    Started by webstood‎, 05-10-2012 06:07 PM
    • Replies: 0
    • Views: 1,425
    05-10-2012, 06:07 PM Go to last post
  8. Significant Correlation, Insignificant Regression

    Dear All, I have a highly significant correlation between two variables (A and B). When using a OLS method, however, the relationship between the...

    Started by TimoV‎, 05-09-2012 01:50 AM
    • Replies: 1
    • Views: 3,788
    05-10-2012, 06:06 PM Go to last post
  9. What tools can we use to solve LR equations to get unknown parameter vector?

    Greetings, Apologies if my explanations are unclear, I am new to data mining coming from business intelligence development area. Let's say we...

    Started by olap‎, 05-10-2012 08:51 AM
    data mining, linear regression, parameter vector
    • Replies: 4
    • Views: 1,951
    05-10-2012, 01:16 PM Go to last post
  10. Squared semi partial correlations

    Hi I have been developing multiple regression models with 2 predictors. The two predictors are slightly correlated and therefore I am wanting to...

    Started by Lisa20‎, 03-31-2012 02:15 AM
    • Replies: 2
    • Views: 2,788
    05-08-2012, 06:53 AM Go to last post
  11. Regression Analysis on cluster of data

    I'm currently a student trying to analyze the relation between the cost of marketing and it's observed returns on those costs. obviously, the...

    Started by webstood‎, 05-06-2012 12:15 PM
    • Replies: 3
    • Views: 2,299
    05-06-2012, 04:09 PM Go to last post
  12. cut-off point for binary logistic regression without ROC curve

    Hi! I just want to know how to find a relatively good cut-off point for binary logistic regression model. I haven't learnt anything on ROC curve. Is...

    Started by xiaochen‎, 05-06-2012 11:29 AM
    cut-point, logistic regression
    • Replies: 0
    • Views: 6,131
    05-06-2012, 11:29 AM Go to last post
  13. which model to use ?

    Hello I have a problem choosing the right model for my data. My response variable is time to event in minutes, when a lower value is better...

    Started by Yankel‎, 05-03-2012 05:55 AM
    • Replies: 3
    • Views: 2,391
    05-04-2012, 02:02 PM Go to last post
  14. Alternatives to Poisson regression for overdispersed count data

    Hi all, I'm currently analyzing data from a series of behavioral experiments that all use the following measure. The participants in this...

    Started by forscher‎, 05-04-2012 11:20 AM
    count data, poisson mean/variance, poisson regression
    • Replies: 6
    • Views: 2,505
    05-04-2012, 11:52 AM Go to last post
  15. relative risk ratios and standard errors

    Hey forum, Odds ratios or relative risk ratios are calculated by exponentiating the coefficients (from a binary or multinomial logit model),...

    Started by cureeous‎, 05-04-2012 12:16 AM
    • Replies: 2
    • Views: 2,962
    05-04-2012, 08:17 AM Go to last post
  16. Timeseries: sig. Ljung-box Q, but residuals normally distributed

    Hi all, Hope someone can help me with the following problem/question I encounter. I'm working with a monthly time-serie consisting of 36 data...

    Started by Eyecatcher‎, 05-03-2012 11:02 AM
    exponential smoothing, ljung-box q, timeseries
    • Replies: 4
    • Views: 7,898
    05-03-2012, 12:15 PM Go to last post
  17. Logistic Regression

    I have a sample of 500 older kids and we want to investigate what factors are related to the probability that they will bully. Groups: kids were...

    Started by glenlivet12‎, 05-02-2012 08:48 AM
    • Replies: 3
    • Views: 2,408
    05-02-2012, 09:09 AM Go to last post
  18. Observation limitation

    I am currently doing my dissertation on how China's economic growth contributes to Hong Kong's income inequality after 1997. However, there are only...

    Started by jkw10‎, 05-02-2012 08:31 AM
    • Replies: 0
    • Views: 1,833
    05-02-2012, 08:31 AM Go to last post
  19. multiple regression and mediators

    Hi I have 10 independent variables and 1 dependent variable. Of the 10 i have selected 4 variables as my predictors for my multiple regression. I...

    Started by eleanor_rigby‎, 05-01-2012 06:52 AM
    • Replies: 4
    • Views: 4,109
    05-02-2012, 05:57 AM Go to last post
  20. Predictors in Logistic regression, SPSS

    Hello. I have the problem I cant deal with. Maybe you can help me? You see, I have 2 samples in retrospective cohort study cases (include 29...

    Started by julbeam‎, 05-01-2012 03:53 AM
    logistic regression, predictor, spss
    • Replies: 3
    • Views: 3,692
    05-01-2012, 02:08 PM Go to last post
  21. Difference in Differences (DID) - control group question

    Hi, I am considering doing the following and I am wondering whether it makes statistical sense. I am interested in comparing the time spent...

    Started by Laco‎, 05-01-2012 12:35 PM
    • Replies: 0
    • Views: 1,179
    05-01-2012, 12:35 PM Go to last post
  22. Thumbs up Simple Question (Multiple Regression)

    Hi Guys and Gals! I am performing linear regression with interaction terms. I also wish to test these variables separately, so predictor1...

    Started by richieboy‎, 05-01-2012 05:51 AM
    • Replies: 1
    • Views: 1,918
    05-01-2012, 09:05 AM Go to last post
  23. Identifying significant covariates

    Hello, I've been asked to identify covariates based on significant associations b/w covariates and the IV as well as the DV. I've never done this...

    Started by Oscar2002‎, 05-01-2012 08:45 AM
    • Replies: 0
    • Views: 2,863
    05-01-2012, 08:45 AM Go to last post
  24. 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: 4,885
    05-01-2012, 02:46 AM Go to last post
  25. Regression Coefficients & Chi Squared test

    I am finding it difficult to understand something I found in a textbook. The author runs a regression of the specification Y = a + bX, on the basis...

    Started by zahg‎, 05-01-2012 01:21 AM
    • Replies: 0
    • Views: 1,648
    05-01-2012, 01:21 AM Go to last post
  26. 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: 1,402
    04-30-2012, 03:14 PM Go to last post
  27. 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: 2,057
    04-29-2012, 06:26 AM Go to last post
  28. 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: 4,172
    04-28-2012, 12:24 PM Go to last post
  29. 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: 5,637
    04-28-2012, 11:36 AM Go to last post
  30. 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: 4,479
    04-27-2012, 01:40 PM Go to last post
  31. 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: 2,163
    04-26-2012, 11:26 AM Go to last post
  32. 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: 2,120
    04-26-2012, 05:29 AM Go to last post
  33. 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: 2,077
    04-26-2012, 01:35 AM Go to last post
  34. 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: 2,113
    04-25-2012, 02:01 PM Go to last post
  35. 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: 1,127
    04-25-2012, 09:31 AM Go to last post
  36. 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: 1,507
    04-24-2012, 10:08 AM Go to last post
  37. 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: 2,634
    04-24-2012, 09:29 AM Go to last post
  38. 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: 3,117
    04-23-2012, 03:25 PM Go to last post
  39. 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: 1,493
    04-23-2012, 08:25 AM Go to last post
  40. 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: 6,117
    04-23-2012, 04:55 AM Go to last post
  41. 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: 1,893
    04-21-2012, 03:43 PM Go to last post
  42. 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: 1,591
    04-21-2012, 04:04 AM Go to last post
  43. 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: 3,130
    04-21-2012, 03:07 AM Go to last post
  44. 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: 1,849
    04-20-2012, 08:17 PM Go to last post
  45. 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: 2,146
    04-20-2012, 02:08 PM Go to last post
  46. 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: 1,770
    04-20-2012, 03:10 AM Go to last post
  47. 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: 2,131
    04-20-2012, 02:57 AM Go to last post
  48. 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: 5,876
    04-19-2012, 05:59 AM Go to last post
  49. 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: 2,848
    04-19-2012, 05:19 AM Go to last post
  50. 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: 1,775
    04-18-2012, 04:25 AM Go to last post
  51. 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: 1,616
    04-17-2012, 01:40 PM Go to last post
  52. 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: 4,388
    04-17-2012, 06:23 AM Go to last post
  53. 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: 1,918
    04-16-2012, 09:18 PM Go to last post
  54. 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: 2,976
    04-16-2012, 05:57 PM Go to last post
  55. 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: 2,056
    04-15-2012, 02:29 AM Go to last post
  56. 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: 2,375
    04-12-2012, 02:17 PM Go to last post
  57. 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: 1,711
    04-11-2012, 05:10 PM Go to last post
  58. 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: 1,548
    04-11-2012, 12:29 PM Go to last post
  59. 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: 2,640
    04-11-2012, 09:30 AM Go to last post
  60. 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: 3,859
    04-11-2012, 03:49 AM Go to last post

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