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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Can anyone help me with a significance problem?

    Hi Everyone, I am running a linear regression for the years 2005 and 2006 for my thesis in which I investigate the relation between having a big...

    Started by Roos‎, 05-02-2014 04:51 PM
    • Replies: 0
    • Views: 1,276
    05-02-2014, 04:51 PM Go to last post
  2. Can covariates be random variables? (logit)

    Hi Everyone. I have been discussing a project at work. My colleague said that he is going to estimate a logit model and include as a covariates...

    Started by harel‎, 04-17-2016 05:50 AM
    • Replies: 5
    • Views: 1,857
    04-18-2016, 05:32 PM Go to last post
  3. Can data be classified as count data?

    Hi, I have a dataset spanning two years which consists of individuals entering some process. Once they have entered this process I want to predict...

    Started by Mkkl‎, 01-15-2017 05:25 AM
    count data, negative binomial, poisson
    • Replies: 2
    • Views: 2,672
    01-15-2017, 08:38 AM Go to last post
  4. Can fixed effects models be used on cross sectional data?

    1) Does it make sense to use a fixed effects model on cross sectional data (note, not time-series cross sectional data) if the goal is to account for...

    Started by Stropharia‎, 01-04-2016 09:46 PM
    fixed effects regression
    • Replies: 0
    • Views: 1,017
    01-04-2016, 09:46 PM Go to last post
  5. Can I analyse R-SQ values for different groups using a T-Test?

    Hi, I am currently doing a piece of analysis which is now starting to confuse me in terms of what statistical analysis I should apply. My Data:...

    Started by mandeep63‎, 11-13-2013 10:52 AM
    • Replies: 0
    • Views: 1,417
    11-13-2013, 10:52 AM Go to last post
  6. Can I combine PCA terms with real variables?

    Hello, I'm new to this forum. Hopefully I am doing this right! I am trying to do a multiple regression analysis on a data set that has about 250...

    Started by Adrian_‎, 03-24-2014 04:47 PM
    • Replies: 0
    • Views: 1,533
    03-24-2014, 04:47 PM Go to last post
  7. Can I compare models like this ?

    Hi, I was trying to fit a linear regression model (simple), for a set of data that shows a very strong linear relation between X and Y. Linearity...

    Started by NN_STAT‎, 07-05-2011 12:53 AM
    • Replies: 3
    • Views: 1,856
    07-05-2011, 01:46 AM Go to last post
  8. Can I compare regression models with same # predictors and same sample?

    Hi there, As a part of my dissertation I want to compare a focal, new, variable against other well-known predictors of my outcome, so I plan to...

    Started by CWRUgradstudent‎, 04-27-2014 11:32 PM
    model comparison, multicollinearity, regression, steiger's z
    • Replies: 7
    • Views: 1,788
    04-28-2014, 11:49 AM Go to last post
  9. Can I derive a standard error from a regression table, and do I need to???

    I am not sure if this can be done, so I would appreciate any insight. I only have a regression table that has IVs with unstandardized and...

    Started by UCFstudent‎, 10-29-2011 05:39 AM
    • Replies: 2
    • Views: 1,578
    10-29-2011, 07:38 AM Go to last post
  10. Can I do this?

    Hey everyone :) I was wondering if I could do this. I have a dependent variable that is age. N = 228. Each participant answered a question which I...

    Started by hafrakaka‎, 07-28-2011 08:32 AM
    • Replies: 0
    • Views: 1,657
    07-28-2011, 08:32 AM Go to last post
  11. Can I draw an interaction plot using Generalised Estimating Equations (GEE)?

    Hello, Can I draw an interaction plot using Generalised Estimating Equations (GEE)? If yes, how? Thanks.

    Started by Paulius‎, 08-16-2015 09:42 AM
    regresion analysis, statistics
    • Replies: 0
    • Views: 581
    08-16-2015, 09:42 AM Go to last post
  12. can I regress first difference on another first difference in cointegration test

    Hello everybody, I have monthly data on world and domestic prices. The model I need to estimate is log-log model (logpdomestic=loga+logpworld+u). So...

    Started by lucky3791‎, 01-02-2013 08:24 AM
    • Replies: 1
    • Views: 1,389
    01-14-2013, 02:07 AM Go to last post
  13. Can I transform the principal components...?

    Hi all. I am using PCA to generate PCs and then using them as independent variables in regression. I added an extra data-step after PCA which is...

    Started by szm‎, 03-14-2013 01:48 PM
    pca, regression, transformation
    • Replies: 0
    • Views: 1,843
    03-14-2013, 01:48 PM Go to last post
  14. Can I trust a regression if variables are autocorrelated?

    Hello everyone! Both variables (dependent and independent) show autocorrelation effects. When I run regression and estimate the residuals, they...

    Started by Mistermishka‎, 12-03-2011 01:48 PM
    autocorrelation, regression analysis, t-statistic
    • Replies: 6
    • Views: 2,756
    12-04-2011, 10:59 AM Go to last post
  15. Can I use group mean centered variables in an OLS regression?

    Hi everyone, I have a question about some analyses I'm working through. I originally ran the model as an HLM because of the nested structure of my...

    Started by sch182‎, 01-02-2014 03:41 PM
    group mean centered, hlm, ols, regression
    • Replies: 0
    • Views: 1,840
    01-02-2014, 03:41 PM Go to last post
  16. Can I use mediation with my data?

    Thanks for taking the time to read this in advance it is quite detailed, but I'm currently working on my psychology honours dissertation, and due to...

    Started by kristy008‎, 09-12-2009 10:08 PM
    • Replies: 2
    • Views: 3,425
    09-13-2009, 01:27 AM Go to last post
  17. Can I use multivariate analysis without univariate analysis?

    Dear all, I have a problem in my data analysis and paper writing. Some variables (dependents) were not statistically significantly correlated...

    Started by celinetang‎, 04-02-2013 05:39 AM
    • Replies: 14
    • Views: 23,718
    01-26-2016, 11:08 AM Go to last post
  18. Can i use regression analysis for this problem?

    Hi So im doing a study and i want to see if there is a trend here What i got: I got data that depends on if a certain animal is using a area (low...

    Started by No idea whats going on‎, 04-04-2014 06:27 PM
    help me
    • Replies: 1
    • Views: 1,252
    04-04-2014, 07:55 PM Go to last post
  19. Can I use regression with a variable that is ordinal?

    I hope that I am posting this in the right place- and I apologize if this has been addressed. I tried to look for it but couldn't find a similar...

    Started by psychstudent11‎, 01-05-2012 10:14 PM
    • Replies: 1
    • Views: 1,557
    01-05-2012, 11:37 PM Go to last post
  20. Can I use regression with this type and amount of data?

    Greetings all. First time poster here and I hope I can find some help. I have looked around this site and on Google for an answer to my questions but...

    Started by northtexas55693‎, 08-13-2013 12:34 AM
    • Replies: 1
    • Views: 1,449
    08-13-2013, 10:07 AM Go to last post
  21. Can logistic regression give opposite results than univariate analyses?

    Dear anyone I am studying the risk for taking drug X. My study population includes >500 people. I have a list of variables (gender, age…)...

    Started by loedrup.ab‎, 10-09-2013 08:56 AM
    • Replies: 4
    • Views: 2,746
    10-11-2013, 03:25 AM Go to last post
  22. Can RSS be decreased to 0 when dimension increases?

    Let's consider a simple example: I have two attributes X1 and X2, each has n values; response variable is Y. Using the two attributes together to...

    Started by ColdKing‎, 12-10-2011 12:59 PM
    dimension, regression, rss
    • Replies: 7
    • Views: 3,345
    12-11-2011, 01:07 AM Go to last post
  23. Can someone help me interpret this data?

    I'm performing multiple regression for an international relations thesis regarding various predictor variables and the outcome of intervention in...

    Started by datorres85‎, 06-18-2016 09:01 PM
    • Replies: 5
    • Views: 1,140
    06-19-2016, 06:58 PM Go to last post
  24. Post Can someone please help me set up regression analysis

    I am a master's student in Environmental Management and have conducted a stated preference experiment in which I presented respondents with two...

    Started by rtd212‎, 03-30-2011 10:36 AM
    regression analysis
    • Replies: 0
    • Views: 2,643
    03-30-2011, 10:36 AM Go to last post
  25. Can someone please please please help me on these homework questions?

    Hello everyone! Im a stats student that is having some difficulty on my homework. I have attached the questions (7) in a picture below. If you could...

    Started by statsstudent1‎, 07-30-2015 02:01 AM
    • Replies: 1
    • Views: 1,242
    07-30-2015, 05:25 AM Go to last post
  26. Cool Can stepwise regression be conducted nonparametrically?

    Hi, I have some data that has shown significance with some variables using SAS mm estimator nonparametric regression, whereas the log transformed...

    Started by Lunarider‎, 06-23-2012 02:05 PM
    • Replies: 0
    • Views: 1,137
    06-23-2012, 02:05 PM Go to last post
  27. Can the PCA scores be used as variables in multiple linear regression

    Hello, I used PCA to reduce the dimensions of a data set of 10 variables into 2 principal components (describing 82% of variance in data set of 10...

    Started by Deccantraps‎, 08-27-2014 06:49 PM
    multiple regression, pca
    • Replies: 6
    • Views: 1,899
    08-31-2014, 04:04 AM Go to last post
  28. can u help me with theses questions


    Started by mqds82‎, 01-08-2013 04:41 AM
    • Replies: 2
    • Views: 1,181
    01-08-2013, 10:12 AM Go to last post
  29. Can we really(theoretically) generalize fixed regressor linear regression?

    If we have stochastic regressors, we are drawing random pairs $(y_i,\vec{x}_i)$ for a bunch of $i$, the so-called random sample, from a fixed but...

    Started by kzhou‎, 05-29-2016 08:52 AM
    fixed regressor, linear regression, stochastic regressor
    • Replies: 3
    • Views: 1,588
    05-30-2016, 09:16 PM Go to last post
  30. can you extrapolate a moving average WAy into the future????

    Hi, I have monthly sales data. I have been asked to do a time series moving average??? If I do a 2 month moving average I can only predict...

    Started by LizR‎, 01-10-2013 06:16 AM
    • Replies: 3
    • Views: 4,361
    01-10-2013, 05:34 PM Go to last post
  31. Can you guys check these for me

    Shade answers to T/F questions and type letter answer to multiple choice questions next to problem number. Chapters 13 & 14 included. T F 1. If a...

    Started by Bicano‎, 12-08-2008 11:07 AM
    • Replies: 1
    • Views: 5,694
    12-08-2008, 03:33 PM Go to last post
  32. Can you help me identify the right test for my data?

    I’m trying to identify the right statistical method to use. Here’s a case analogous to mine: Let’s say I’m interested in whether basketball team...

    Started by Frameshift‎, 11-06-2015 06:19 PM
    • Replies: 0
    • Views: 1,280
    11-06-2015, 06:19 PM Go to last post
  33. can you help me interpret this?

    Vitamin D varies with season, below is a method of de-seasonalising vit D from literature. I'm not too sure what they've done after regressing the...

    Started by bobmcpop‎, 12-30-2013 06:50 AM
    • Replies: 4
    • Views: 1,704
    01-04-2014, 10:50 AM Go to last post
  34. Can you include X1/X2 in a model when you've already included X1 and X2?

    Can you include X1/X2 in a model when you've already included X1 and X2? For example, I am trying to predict housing prices. X1=square feet and...

    Started by smw10c‎, 04-08-2017 12:40 PM
    • Replies: 4
    • Views: 718
    04-11-2017, 02:59 PM Go to last post
  35. Can you predict a categorical outcome with multiple regression?

    Hello - I want to predict an employee will be likely to leave a company based on variables such as tenure, age, function (categorical), # of...

    Started by yichuansancun‎, 11-30-2013 03:58 AM
    • Replies: 1
    • Views: 1,235
    11-30-2013, 06:41 AM Go to last post
  36. Cant do a linear regression on a subset of my data: Error

    I installed the R package AER, from which you get the data `PSID1982`. Then I define this model: data("PSID1982") set.seed(15606) ...

    Started by Latriuz‎, 01-17-2016 11:53 AM
    • Replies: 0
    • Views: 534
    01-17-2016, 11:53 AM Go to last post
  37. CARs from small sample(26): Which Regression is the best to perform?

    Dear All, I am new to this forum, but I am trying to become more and more specified in statistics for my Master Thesis (Erasmus University...

    Started by Bart Lips‎, 07-17-2012 08:12 AM
    event study, regression analysis, small sample size
    • Replies: 5
    • Views: 3,426
    07-23-2012, 02:13 PM Go to last post
  38. Categorical Count Data and ANOVA

    Hi, I hope this is in the right section. I heard that ANOVA shouldn't be used for analysing categorical count data. If this is the case, can...

    Started by wy38‎, 08-17-2010 10:42 AM
    • Replies: 6
    • Views: 12,508
    08-17-2010, 09:54 PM Go to last post
  39. Categorical data tested for several factors: which test should I use?

    Hi guys, I'm currently doing a research project as part of my internship on mangrove damage along a river as a consequence of a major flood...

    Started by Robert1707‎, 05-11-2014 06:23 PM
    categorical data, dependent variables, factors, independent variable, test
    • Replies: 4
    • Views: 1,403
    05-14-2014, 11:53 AM Go to last post
  40. Categorical dependent variables / ANOVA

    Hi all! Newbie here. In my current work role, I'm thought of as an expert on stats. This is totally untrue - but it doesn't take much to be seen...

    Started by DOER‎, 03-05-2014 10:34 AM
    • Replies: 14
    • Views: 2,923
    03-10-2014, 09:27 AM Go to last post
  41. Categorical multiple linear regression analysis - what would you do?

    Noob here. I'm doing a project to determine how different factors (race, insurance status) are related to distance from pediatric urologists. I'm...

    Started by gliomanerd‎, 09-01-2016 10:35 AM
    categorial analysis, multiple regression
    • Replies: 4
    • Views: 1,099
    09-05-2016, 07:16 PM Go to last post
  42. Categorical predictors in multiple regression

    Hi, I have a question my thesis advisor cant help with. I'm trying to test the hypothesis that ambivalence towards eating meat is moderated by...

    Started by Pachy‎, 07-05-2011 05:14 PM
    • Replies: 1
    • Views: 2,056
    07-05-2011, 06:35 PM Go to last post
  43. categorical predictors with multiple categories in logistic regression

    Hi, I have a predictor X with 6 classes (X1, X2, X3, X4, X5, X6) in a logistic regression model. The p value for the class of reference (X1) is...

    Started by orchidn‎, 03-29-2014 06:26 PM
    • Replies: 1
    • Views: 2,076
    03-29-2014, 08:32 PM Go to last post
  44. Categorical regression question

    Hi, everyone Hope the experts here can help me out with a question. I have a database with several respondents providing data on...

    Started by kladan‎, 07-13-2010 12:24 PM
    • Replies: 5
    • Views: 4,024
    07-13-2010, 02:47 PM Go to last post
  45. Question Categorical variable as dependent variable

    I have a categorical variable which is like: "How much do you like the sun?" 1 not at all 2 not a great deal 3 neither/nor 4 quite a lot 5...

    Started by Athinagoras‎, 04-12-2013 09:00 AM
    categorical, categorical dependent, dpendent, dummy
    • Replies: 6
    • Views: 1,990
    04-12-2013, 11:28 AM Go to last post
  46. Categorical variables - Logistic regression

    Hello, I am trying to run a logistic regression model. I have 4 numeric and 1 categorical variable which are significant. The categorical...

    Started by nikhil_s‎, 03-07-2012 10:38 AM
    binning, categorical data analysis, categorical vairable, logistic regression
    • Replies: 5
    • Views: 3,886
    03-07-2012, 02:06 PM Go to last post
  47. Categorical variables and interaction in MLR

    Would it be correct, to add in multiple linear regrression interaction between two categorical variables (i transformed them - dummy variavles) with...

    Started by Myron Tsisinskiy‎, 11-18-2011 04:40 AM
    categorical vairable, interaction term, multiple regression
    • Replies: 9
    • Views: 3,368
    11-19-2011, 04:14 PM Go to last post
  48. Categorical variables changing by their groupmean

    Hi For a project I need to model industrial data. Large part of the dataset consists out of nominal categorical variables (430 variables in total...

    Started by studentbelg‎, 03-08-2016 05:20 PM
    • Replies: 0
    • Views: 1,029
    03-08-2016, 05:20 PM Go to last post
  49. categorical variables in proc logistic

    Hi together, i'm using proc logistic to optimize a model for closures on an insurance in dependence of several categorical variables. Due to...

    Started by manito‎, 01-12-2012 06:16 AM
    • Replies: 2
    • Views: 2,298
    01-13-2012, 08:05 AM Go to last post
  50. categorical variables in regression analysis and interaction terms

    I am learning multiple regression with categorical variables and in a book I came across this problem. For yield of corn suppose there are two...

    Started by Clarkson‎, 07-02-2014 05:32 AM
    categorical data, interaction term, regression analysis
    • Replies: 1
    • Views: 2,455
    07-02-2014, 01:33 PM Go to last post
  51. Causal mediation analysis with lagged endogeneous regressors

    Hello dear forum members! So, in the study I am currently working on, I have the following (simplified) Poisson panel model with fixed-effects...

    Started by kiton‎, 06-11-2016 03:16 PM
    • Replies: 1
    • Views: 981
    06-12-2016, 11:56 PM Go to last post
  52. Cave Temperature Analysis, Real life management issues.

    Hi, I've taken math course's up to Calc III and Diff Eq, but never a statistics course. So I was hoping this forum could help me. I am working...

    Started by geoskimoto‎, 09-02-2016 12:13 PM
    anova, help me, help needed, linear regression, model
    • Replies: 0
    • Views: 933
    09-02-2016, 12:13 PM Go to last post
  53. Cenetering: Not that hard (unless you don't fully get it)

    I'm a hands on visual learner. So I read about: gran mean and group mean centering. I also read this seminal piece by Enders and Tofighi:...

    Started by trinker‎, 03-09-2014 01:53 PM
    • Replies: 2
    • Views: 1,464
    03-10-2014, 09:24 AM Go to last post
  54. centered polynomials

    in a model involving Y= B0 + B1X1 + B2X2^2, how does centering the model affect the parameters. why does the hypothesis test associated with B2...

    Started by floriandotti‎, 11-23-2010 12:09 AM
    • Replies: 1
    • Views: 4,190
    11-23-2010, 01:01 AM Go to last post
  55. Centered simple betas should be =?

    I'm reading Aiken and West Multiple Regression: Testing and Interpenetrating Interactions (p. 33-34) Assume CENTERED means: X_i-\bar{X}_i They...

    Started by trinker‎, 10-18-2011 06:50 PM
    • Replies: 2
    • Views: 2,321
    10-18-2011, 08:09 PM Go to last post
  56. Centering and transforming

    Hello, I'm performing a multiple regression analysis and have a question about transforming variables. I am using two IVs to see if there are...

    Started by statishtics‎, 08-27-2008 03:45 PM
    • Replies: 1
    • Views: 3,029
    08-28-2008, 05:05 AM Go to last post
  57. 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: 1,642
    02-07-2012, 10:36 AM Go to last post
  58. Centering Variables in Interaction with Lagged Dependent Variable

    I have to run this regression: Y (t) = a + b1 X (t-1) + b2 Y (t-1) + b3 X (t-1)*Y (t-1) Y at time "t" is regressed using as IVs X at time t-1,...

    Started by jjarg‎, 03-16-2015 04:25 PM
    interaction, lagged variable
    • Replies: 1
    • Views: 1,392
    03-16-2015, 05:04 PM Go to last post
  59. change in significance level (univariate vs multivariate)

    I have 3 independent variables, X, Y and Z when I do univariate regression on each of them, the t-statistics are -4.7, 1.8 and 2.2, respectively....

    Started by espes‎, 10-24-2011 06:35 PM
    • Replies: 4
    • Views: 5,100
    10-25-2011, 10:09 AM Go to last post
  60. Change regression model ($x^*_i = x_i -10$)

    Hi there.:wave: I'm solving an exercise on multiple linear regression. Near the end I will be asked for the same data as the previous model, it is...

    Started by valentina89‎, 06-23-2016 04:53 PM
    parameter estimation, regression model
    • Replies: 5
    • Views: 2,348
    06-26-2016, 04:18 AM Go to last post

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