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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Interaction terms between correlated predictors

    Hello, I'm trying to test how the amount of native forest in a landscape affects the number of bird species, and how this relationship varies with...

    Started by souffle‎, 03-01-2012 09:55 PM
    • Replies: 2
    • Views: 1,660
    03-06-2012, 06:12 PM Go to last post
  2. Need help understanding an equality associated with regression analysis

    Hi everyone, I am attempting to understand the implications the equality listed below has in regards to regression models. The equality is...

    Started by phightins530‎, 03-06-2012 02:13 PM
    • Replies: 4
    • Views: 1,033
    03-06-2012, 04:20 PM Go to last post
  3. Is Slope A statistically different from Slope B? *URGENT*

    Hey everyone, Really need urgent help here. I am trying to determine if the change in the slope of a line (beta) is statistically significant...

    Started by explicit‎, 03-06-2012 01:25 AM
    • Replies: 7
    • Views: 17,707
    03-06-2012, 11:39 AM Go to last post
  4. Does fitting of a regression line as such contribute to mass significance?

    Is the fitting of a regression line (least squares, for a given number of predictors) as such to be regarded a statistical test that can contribute...

    Started by Bassler‎, 03-06-2012 05:04 AM
    false positives, fitting a line, least squares, mass significance, regression line
    • Replies: 0
    • Views: 771
    03-06-2012, 05:04 AM Go to last post
  5. Semi-saturated Fixed Effects

    Today my supervisor instructed me to try to use semi-saturated Fixed Effects analysis. I have tried searching for "semi-saturated" and "saturated"...

    Started by Laco‎, 03-01-2012 01:07 PM
    • Replies: 4
    • Views: 1,673
    03-04-2012, 01:15 PM Go to last post
  6. Urgent Help required: How to calculate linear predictor x in this table?

    Dear All, Please help

    Started by graced‎, 03-03-2012 07:56 AM
    • Replies: 5
    • Views: 1,319
    03-04-2012, 12:32 AM Go to last post
  7. Logistic Regression

    Hi, I am using R. For example, Y=β0 + β1X1+ β2X2 = log (a/(1-a)) where a = probability >g1<-glm(Count~X1+X2,family="binomial")...

    Started by paxy‎, 02-29-2012 02:40 AM
    • Replies: 1
    • Views: 823
    03-02-2012, 04:39 PM Go to last post
  8. Fixed Effects and interaction terms

    I am trying to analyze sex difference in housework time using longitudinal data with Fixed Effects. Since, sex is time-invariant I can not...

    Started by Laco‎, 03-01-2012 05:33 PM
    • Replies: 2
    • Views: 5,227
    03-01-2012, 06:01 PM Go to last post
  9. log linear model for dependence

    Hi I fitted a log linear model (proc genmod dist=negative binomial link=log) to see any dependence/association between 3 categorical variables. I...

    Started by szm‎, 02-29-2012 10:31 AM
    count, dependence, log linear, poisson regression
    • Replies: 2
    • Views: 1,016
    02-29-2012, 02:53 PM Go to last post
  10. Regression table interpretation problem

    Hello all, I am a complete beginner in statistics but I have come across a table I need to interpret for my research. Although it's probably a...

    Started by Nebounette‎, 02-28-2012 04:54 PM
    • Replies: 8
    • Views: 2,314
    02-29-2012, 09:58 AM Go to last post
  11. Cool Sequential Logit Model (Hurricane Evacuations)


    Started by tenki‎, 02-28-2012 02:10 PM
    • Replies: 0
    • Views: 714
    02-28-2012, 02:10 PM Go to last post
  12. Angry Multiple regression, removing very small coefficients

    Hello, I did 'backwards method' multiple regression in SPSS to predict 'energy'. The R^2 value is 0.951. Here is the final output model of the...

    Started by bradyj2‎, 02-28-2012 08:43 AM
    • Replies: 1
    • Views: 1,906
    02-28-2012, 11:42 AM Go to last post
  13. Regression Help! to predict performance using the output of questionaire

    Hi All, Somebody pl. helpe me in the brlow case, As a part of academic project, im intrested in measuring performance of purchase dpeartment in a...

    Started by Arjun‎, 02-22-2012 05:08 AM
    multiple regression, regression analysis
    • Replies: 13
    • Views: 1,788
    02-28-2012, 01:12 AM Go to last post
  14. Articles/information on robust regression?

    Hi, I am a little confused as to what methods there are for "robust" regression. I thought it was an actual type (as in logistic, linear, etc),...

    Started by statn00b‎, 02-23-2012 09:05 AM
    • Replies: 5
    • Views: 1,362
    02-26-2012, 07:32 PM Go to last post
  15. how many time dummies in pooled regression?

    Hi guys, I want to perform a cross sectional time series regression - fixed effects model. Am I correct that it is better to group time by time...

    Started by SylviaS‎, 02-23-2012 08:44 AM
    • Replies: 2
    • Views: 2,532
    02-26-2012, 06:43 PM Go to last post
  16. Is this an instance of simultaneity? Can you help me understand why?

    I cant seem to figure this out, as standard descriptions of simultaneity in econometrics textbooks don't quite seem to fit. 1. I have panel data...

    Started by andrewcd‎, 02-24-2012 10:45 PM
    • Replies: 0
    • Views: 930
    02-24-2012, 10:45 PM Go to last post
  17. multivariate logistic regression

    Hello, I need to perform multivariate logistic regression on 3 binary variables. My independent variables are also categorical (3-10 levels)...

    Started by szm‎, 02-23-2012 07:38 PM
    logistic regression, multivariate, multivariate logistic reg, sas
    • Replies: 1
    • Views: 1,501
    02-24-2012, 10:09 AM Go to last post
  18. Stats Help Regression

    Hi, Do you know what kind of regression tests I should run for this and how to run them? Thanks for your help. Attached is the file.

    Started by baller99‎, 02-23-2012 04:40 PM
    • Replies: 4
    • Views: 995
    02-23-2012, 06:36 PM Go to last post
  19. Regression of Conditional Expectations E[Y|X,Z=z] = f(E[X|Z=z])

    Hello all, I have a regression problem I'm interested in that seem like it should be a fairly common and well understood, but due to my weak...

    Started by NITHOS‎, 02-23-2012 01:12 PM
    • Replies: 0
    • Views: 823
    02-23-2012, 01:12 PM Go to last post
  20. Regression on Composite Rates

    I have what may be a simple question, but I have been unable to find an appropriate methodology, and I am hoping that one of you may be able to help....

    Started by BrandonB‎, 02-22-2012 06:26 PM
    • Replies: 0
    • Views: 1,062
    02-22-2012, 06:26 PM Go to last post
  21. Interpreting mean centered polynomial regression

    Hi, I'm running a simple OLS regression and want to examine non-linear effects. Therefore I have included a square term of the independent...

    Started by economix‎, 02-21-2012 02:56 PM
    • Replies: 0
    • Views: 1,831
    02-21-2012, 02:56 PM Go to last post
  22. Number of Observations Question

    I am currently completing a research project on a certain type of fund. I would like to conduct a time series. It is my aim to analyse the...

    Started by Student_Researcher‎, 02-21-2012 11:47 AM
    number of observations
    • Replies: 0
    • Views: 926
    02-21-2012, 11:47 AM Go to last post
  23. Regression on Counts

    Hi, I have data on number of laps mice have run over several days after an injection (simulate injury) and receiving one of two treatments...

    Started by ted‎, 02-14-2012 01:29 PM
    • Replies: 7
    • Views: 1,370
    02-20-2012, 04:09 PM Go to last post
  24. Question Ordered Logit Model

    Using the World Values Survey (http://www.wvsevsdb.com/wvs/WVSData.jsp), I am trying to run an ordered logit model on a continuous dependent variable...

    Started by toddsqui‎, 02-19-2012 05:14 PM
    • Replies: 1
    • Views: 1,245
    02-20-2012, 12:48 PM Go to last post
  25. Question regarding changes in the value of coefficients

    I am not sure how to answer part A of this question. Thank you!

    Started by shle‎, 02-20-2012 12:16 AM
    • Replies: 3
    • Views: 1,152
    02-20-2012, 05:18 AM Go to last post
  26. Why does efficiency matter

    In a discussion of my old favorite non-normal data, Fox notes that while CI and test of signficance are commonly not effected much by nonnormality in...

    Started by noetsi‎, 02-16-2012 02:01 PM
    • Replies: 5
    • Views: 1,363
    02-17-2012, 11:49 AM Go to last post
  27. Grouping response in logistic regression

    Hi, I'm new to statistics and hope to find some help here. I can't find any information on why in logistic regression a binary response is often...

    Started by caro‎, 02-17-2012 08:03 AM
    • Replies: 2
    • Views: 1,170
    02-17-2012, 11:10 AM Go to last post
  28. Calculating adjusted treatment means in regression

    Hi, I have two treatment groups, intervention (n=76) and control (n=156). I have a dependent variable, weight, and a couple of baseline variables...

    Started by Statstastic‎, 02-16-2012 07:14 AM
    • Replies: 1
    • Views: 1,448
    02-16-2012, 03:08 PM Go to last post
  29. Is R squared number valid when forcing a slope on regression fit line?

    When I plot my log transformed data and do a regression fit, I get a slope of 3.37 and a r-squared of 0.96. My professor wants me to "force" a slope...

    Started by SeatOFpants‎, 02-15-2012 03:07 PM
    • Replies: 12
    • Views: 4,142
    02-16-2012, 02:06 PM Go to last post
  30. comparing regression coefficients from the same model

    Hi, I think this question has been answered in bits and pieces here and there, but I am still a bit unsure about what the best approach for this is:...

    Started by kk49‎, 02-14-2012 10:14 AM
    • Replies: 12
    • Views: 9,474
    02-16-2012, 12:47 PM Go to last post
  31. Comparing regressions

    Hi, I want to conduct a sensitivity analysis on a regression to check if the results are highly influenced by the sample I have. Basically, I want...

    Started by Oritteropus‎, 02-16-2012 11:53 AM
    • Replies: 3
    • Views: 971
    02-16-2012, 12:40 PM Go to last post
  32. How to interpret/present interaction term

    I have survey dataset where I created a knowledge score.There are four possible right answers. I used this as continuous variables, and it checked...

    Started by smd19‎, 02-15-2012 12:41 PM
    • Replies: 2
    • Views: 1,977
    02-15-2012, 03:45 PM Go to last post
  33. Weibull MLE with right hand censoring

    I am having trouble writing the MLE function for a weibull distribution with right hand censoring at specific value. W(DURATION VARIABLE) X1 X2 ...

    Started by samulleg364‎, 02-14-2012 11:33 PM
    • Replies: 2
    • Views: 1,416
    02-15-2012, 03:13 AM Go to last post
  34. Nested ANOVA - Replication vs. Pseudoreplication - pulling hair out, please help

    Hello all, I am trying to run a nested ANOVA in JMP on some ecological field data - I'm trying to measure whether fish biomass is different in...

    Started by vogtro‎, 02-10-2012 08:09 PM
    3 Pages
    1 2 3
    • Replies: 30
    • Views: 10,386
    02-15-2012, 12:22 AM Go to last post
  35. Predicting a Ratio, when the denominator of that Ratio is a logical weight variable

    I am attempting a basketball regression. The dataset is a bit complicated to explain, but basically each observation represents a stint of 5 players...

    Started by YaoPau‎, 02-14-2012 06:46 AM
    • Replies: 1
    • Views: 958
    02-14-2012, 12:31 PM Go to last post
  36. marginal effect with wald test

    Hi there, In an econometrics assignment we have to check what variable has the largest and smallest marginal effect on our dependent variable wage....

    Started by davidmax1990‎, 02-14-2012 12:29 PM
    • Replies: 0
    • Views: 808
    02-14-2012, 12:29 PM Go to last post
  37. Multiple regression in the analysis of telephone calls

    Hi everyone, I'm new to multiple regression and I'm having a few concerns about my analysis and I could do with some advice. Firstly, the...

    Started by jassco‎, 02-10-2012 08:19 AM
    • Replies: 13
    • Views: 1,957
    02-13-2012, 07:51 PM Go to last post
  38. Dependent categorical variable

    If y is a dependent categorical variable (values 1,2,3) , then how would you show that y is dependent on x1 and x2? My rational is to use a...

    Started by samulleg364‎, 02-13-2012 01:06 PM
    • Replies: 2
    • Views: 1,147
    02-13-2012, 01:57 PM Go to last post
  39. Multiple regression for duplicate payments

    Has anyone had any kind of experience using regression in financial and accounting areas for multiple or duplicate payments. thanks Vic

    Started by ssvictor‎, 02-13-2012 10:24 AM
    • Replies: 0
    • Views: 777
    02-13-2012, 10:24 AM Go to last post
  40. Modelling problem

    Hi there! I have this modelling problem, and I'd like to get some input/ideas. My data are produced power and measured wind speed at a wind...

    Started by caoshaug‎, 02-07-2012 06:20 AM
    • Replies: 13
    • Views: 1,636
    02-13-2012, 09:50 AM Go to last post
  41. Multiple Regression and Confounding Factors

    I am working on my thesis project which involves analyzing whether a dichotomous independent variable has an effect on a continuous dependent...

    Started by laura77‎, 02-12-2012 06:24 PM
    confounders, multiple regression
    • Replies: 3
    • Views: 8,135
    02-13-2012, 09:45 AM Go to last post
  42. meaningful value for R squared

    Hi, I did a simple linear regression with two variables (X & Y), both scores that were calculated (mean) on the basis of scores for the items of...

    Started by lucn‎, 02-13-2012 04:37 AM
    • Replies: 3
    • Views: 3,526
    02-13-2012, 09:20 AM Go to last post
  43. Linear Regression mystery

    A linear model was built, using 2 explanatory variables and 30 observations. the results were: B=(3.57, -0.18, 1.259)^t (the coefficients) ...

    Started by Yankel‎, 02-12-2012 07:44 AM
    • Replies: 6
    • Views: 1,594
    02-12-2012, 02:11 PM Go to last post
  44. Need help with Regression Analysis

    Have a problem that I need help with if anyone can help me. The correlation between scores on tests of sociability and sense of humor was found...

    Started by statistichelp‎, 02-11-2012 06:50 PM
    • Replies: 1
    • Views: 959
    02-11-2012, 07:08 PM Go to last post
  45. Simple slopes tests for 4-way, mixed regression interaction - Please help!

    I have conducted a regression analysis that yields a significant 4-way interaction between: 2 dichotomous within-subjects variables 2 continuous...

    Started by ldtdata‎, 02-11-2012 02:19 AM
    continuous iv, dichotomous iv, mixed-model
    • Replies: 0
    • Views: 950
    02-11-2012, 02:19 AM Go to last post
  46. Maximum likelihood model estimation

    W3 is a duration variable. Values greater than or equal to 3 are incomplete durations. Estimate an appropriate model for this variable and show how...

    Started by samulleg364‎, 02-09-2012 12:58 PM
    • Replies: 8
    • Views: 1,579
    02-10-2012, 06:29 PM Go to last post
  47. Error in data matrix, least square error analysis

    Dear all, I am trying to reach an expression for the mean square error (mse) when the data matrix 'A' in the classical least square problem Ax=b...

    Started by sensor101‎, 02-10-2012 02:17 PM
    • Replies: 0
    • Views: 975
    02-10-2012, 02:17 PM Go to last post
  48. Regression Rookie Seeks Help

    Hi I have some data that i have been trying to use regression on. I have done individual regression analysis on Minitab 16 but was wondering is...

    Started by StuckWithStatsStan‎, 02-09-2012 06:54 PM
    • Replies: 14
    • Views: 1,511
    02-10-2012, 10:16 AM Go to last post
  49. 95% Intervals

    I'm new here (and relatively new to statistics) so I apologize if this thread is in the wrong place. I have a problem that seems relatively easy...

    Started by bravo3‎, 02-05-2012 06:10 PM
    confidence intervals, normal distribution, tolerance intervals
    • Replies: 4
    • Views: 1,405
    02-09-2012, 11:31 PM Go to last post
  50. Building a Logisics regression model - help

    Audited ~50 patients, and collected 10 potential predictors for each (some quantitative, some indicative, all independent). Trying to develop a...

    Started by j_cocker‎, 02-09-2012 05:49 AM
    • Replies: 6
    • Views: 1,390
    02-09-2012, 06:03 PM Go to last post
  51. Relation between 2 linear regression curves

    Hello Everyone, I'm new here, I'm hoping someone may be able to help me as Im a bit stuck. Its probably so simple but for some reason this problem...

    Started by gypsyeyes‎, 02-07-2012 09:25 PM
    • Replies: 3
    • Views: 986
    02-09-2012, 05:35 PM Go to last post
  52. Help--A basic linear regression problem

    This equations are come from a text book. I want to know that why (I-H)Xβ disappeared in the last formula. Thanks a lot.

    Started by Jason222‎, 02-09-2012 04:06 PM
    • Replies: 2
    • Views: 1,011
    02-09-2012, 04:20 PM Go to last post
  53. Lowest Mean Squared Error doesn't mean highest R^2?

    Question: Well, the title says it already. Does the lowest Mean Squared Error not automatically mean the highest R^2? Reason for asking: I'm doing...

    Started by Jolien‎, 02-06-2012 09:52 PM
    • Replies: 5
    • Views: 1,601
    02-09-2012, 12:15 AM Go to last post
  54. Interpreting regression analysis results help

    I am trying to analyse some medical data looking at a possible link between various variables (patient age, period on specific medication, medication...

    Started by j_cocker‎, 02-06-2012 06:37 PM
    • Replies: 4
    • Views: 1,339
    02-07-2012, 08:23 PM Go to last post
  55. Centering IVs for checking interaction effects in regression analysis

    Attention: I have just skimmed an article (Echambadi, R. and Hess, J.d. (2007) Mean-Centering Does Not Alleviate Collinearity Problems in Moderated...

    Started by MrChris86‎, 02-07-2012 10:36 AM
    centering, interaction, regression analysis
    • Replies: 0
    • Views: 1,119
    02-07-2012, 10:36 AM Go to last post
  56. Geographically Weighted Regression

    Hi, I am working on a project that aims to find any relationships between respiratory health with different environmental variables. I am...

    Started by lau86‎, 02-06-2012 08:00 AM
    • Replies: 1
    • Views: 778
    02-07-2012, 07:28 AM Go to last post
  57. Random Regression Analysis

    I posted this in the R forum, which was the incorrect place to put this I think. I have a set of data that includes: 15 repeated measures for...

    Started by segerfan83‎, 02-06-2012 02:09 PM
    • Replies: 0
    • Views: 1,744
    02-06-2012, 02:09 PM Go to last post
  58. Linear model accounting for fixed effects vs. ordered probit

    I originally ran an ordered probit model on an ordinal dependent variable (values 1-12), however in order to account for fixed effects in my analysis...

    Started by ARW90‎, 02-04-2012 10:38 AM
    econometrics, fixed effects, ordered, probit
    • Replies: 3
    • Views: 2,309
    02-05-2012, 01:44 PM Go to last post
  59. Question about Regression and relationship testing

    Hello, I am working on a project that is trying to look a possible correlation between BMI and various outcomes in a patient group. So the BMI...

    Started by artaxerxes‎, 02-03-2012 10:24 AM
    • Replies: 5
    • Views: 1,410
    02-03-2012, 01:04 PM Go to last post
  60. Smile [REGRESSION - REPEATED MEASURES] testing interactions with criterion scaling

    Hello everyone, I have a question about the criterion scaling method of analysing repeated-measures designs (Pedhazur, 1977). As far as I...

    Started by Lara333‎, 02-03-2012 11:11 AM
    • Replies: 0
    • Views: 1,235
    02-03-2012, 11:11 AM Go to last post

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