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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Logistic Regression

    Hello I am going to start building a Logistic Regression model based on medical data for the purpose of classification. My problem started with...

    Started by osamastat‎, 08-15-2015 06:44 AM
    • Replies: 4
    • Views: 843
    08-16-2015, 02:37 PM Go to last post
  2. Confounder

    What if I see a 10% change (decrease) in an variable effect (X1 on Y) when including another variable (X2), though the effect of X1 is never remotely...

    Started by hlsmith‎, 08-13-2015 05:12 PM
    • Replies: 3
    • Views: 669
    08-16-2015, 12:16 PM Go to last post
  3. 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 10:42 AM
    regresion analysis, statistics
    • Replies: 0
    • Views: 388
    08-16-2015, 10:42 AM Go to last post
  4. Difference-in-difference regression

    Hello, I have a problem with my current research project and I am not very experienced with statistics so it would be great to find some help...

    Started by ERa‎, 08-16-2015 02:46 AM
    difference in difference, difference-in-difference, ols, ols regression, regression
    • Replies: 0
    • Views: 533
    08-16-2015, 02:46 AM Go to last post
  5. Best way to code a variable in a hierarchical (multi-level) regression?

    The outcome is binary, and I have individual-level data and geographical-level data. It's the latter I need help with. Here's the best example:...

    Started by oncearunner‎, 08-13-2015 09:38 PM
    • Replies: 1
    • Views: 435
    08-13-2015, 10:54 PM Go to last post
  6. Logistic Regression: collinearity btw continuous and categorical predictors?

    Hi All, I am still working on fitting a binary Logistic Regression model in which the DV is land 'optimal vs. non-optimal quality', and the IVs are...

    Started by gianmarco‎, 08-12-2015 06:22 AM
    • Replies: 7
    • Views: 985
    08-12-2015, 08:21 AM Go to last post
  7. Which model would you choose?

    Dear readers, I am struggeling with the model selection (ICs are very different and many insignificant models). Which model would you choose, and...

    Started by martijn9000‎, 08-12-2015 07:17 AM
    aic bic, model selection
    • Replies: 1
    • Views: 441
    08-12-2015, 07:35 AM Go to last post
  8. How to handle missing values in lm.fit?

    Is there a way to use lm.fit without completely removing rows with missing data using R? Is there a way for lm.fit to leave out one piece of...

    Started by RM1004‎, 08-10-2015 11:36 AM
    missing data, regression model
    • Replies: 1
    • Views: 428
    08-10-2015, 04:33 PM Go to last post
  9. Help with regression model

    Hi, I am trying to understand whether there are any problems with a regression model I'm using for research. I'm interested in the effect of...

    Started by oracle133‎, 08-10-2015 11:11 AM
    • Replies: 0
    • Views: 356
    08-10-2015, 11:11 AM Go to last post
  10. Polynomial Regression

    Is there anyway to get this formula in the polar opposite where X = Expression? I am hoping to get this so that I can use it to help do a...

    Started by mrmmickle1‎, 08-06-2015 11:42 PM
    • Replies: 0
    • Views: 568
    08-06-2015, 11:42 PM Go to last post
  11. Best Way to Format an Excel Data Sheet for export to R.

    Hi. I am conducting a multiple linear regression using Panel data for my finance honours research project. I have collected data for 100 stocks...

    Started by DCKALE002‎, 08-06-2015 09:10 AM
    • Replies: 0
    • Views: 501
    08-06-2015, 09:10 AM Go to last post
  12. Comparing linear regression models: a chi-squared test to compare adjusted R-squares?

    Hi all, I used linear regression to analyze the data of one of my experiments, and used 3 predictors in a first model, added 4 more predictors in...

    Started by Maayke‎, 08-05-2015 07:43 AM
    • Replies: 1
    • Views: 549
    08-06-2015, 04:04 AM Go to last post
  13. Experiment Design Help please

    Hi All I have used a Central Composite Design (CCD) for my experiments, where I have three Factors (A, B, c) and each Factor has five values. I have...

    Started by Dlair‎, 06-21-2015 09:16 AM
    • Replies: 2
    • Views: 755
    08-04-2015, 06:15 PM Go to last post
  14. p-value of a coefficient from a regression

    The t-stat value follows a two-tail symmetric t-distribution with mean and median of zero? Am I correct so far? If so, then how can you get a...

    Started by oahz‎, 08-04-2015 11:03 AM
    • Replies: 9
    • Views: 839
    08-04-2015, 05:54 PM Go to last post
  15. Probit Regression

    Hİ all. Hope everyone is great. I just want to ask a question. What are the assumptions of probit regression? Can you offer me a book about probit...

    Started by chivasrom‎, 08-04-2015 03:33 AM
    • Replies: 1
    • Views: 461
    08-04-2015, 04:39 AM Go to last post
  16. Impact of heteroscedasticity and non-normality on utility of regression result?

    Hello: I am using least squares 2nd order polynomial regression to determine the effect of a single independent variable (X) on a dependent...

    Started by Joost‎, 08-01-2015 08:45 PM
    • Replies: 0
    • Views: 453
    08-01-2015, 08:45 PM Go to last post
  17. What if you are not interested in a variable that has been found to matter in the lit

    The article I am working for stresses the importance of a variable that my organization has no interest in at all. It is an important control, should...

    Started by noetsi‎, 07-31-2015 02:03 PM
    • Replies: 4
    • Views: 696
    08-01-2015, 04:28 AM Go to last post
  18. SPSS Logistic Regression Predicts Too Many Negatives?

    Hello everybody, I have a logistic regression model, where the outcome Yes is coded as 1, No as 0. The split between Yes and No is about 30/70...

    Started by pd1598‎, 07-31-2015 11:41 AM
    • Replies: 6
    • Views: 640
    08-01-2015, 03:28 AM Go to last post
  19. New to hierarchical regression, looking for advice

    Hey all, I am relatively experienced in plain old OLS and I'm trying to learn how to do mixed-effects, hierarchical modeling. I got Andrew...

    Started by sasin‎, 07-31-2015 07:57 PM
    • Replies: 0
    • Views: 430
    07-31-2015, 07:57 PM Go to last post
  20. What is "mixed-effects OLS regression"

    It is mentioned on p 14 of the link below. I have never heard of it before... ...

    Started by noetsi‎, 07-31-2015 01:58 PM
    • Replies: 3
    • Views: 508
    07-31-2015, 07:21 PM Go to last post
  21. Fixed Effects Regression - Dependent Variable Issue

    Hi all, I am currently running a fixed effects model in Stata, and have a question regarding how to specify my dependent variable. So I have...

    Started by Magnus MMJ‎, 07-27-2015 06:12 PM
    • Replies: 8
    • Views: 868
    07-31-2015, 10:22 AM Go to last post
  22. Linear Reg (Press Statistic)

    I was not familiar with the Press Statistic. I am currently looking it up. Seems to be a leave-one-out procedure. Can any one provide some...

    Started by hlsmith‎, 07-30-2015 08:43 AM
    • Replies: 2
    • Views: 499
    07-30-2015, 09:06 AM Go to last post
  23. Relationship between 2 variables & 1 dependant

    Hi all, My wife is busy with an assignment that is even giving me grey hair. She needs to determine the relationships between 2 variables and 1...

    Started by kiepie‎, 07-28-2015 01:40 PM
    • Replies: 7
    • Views: 641
    07-30-2015, 08:45 AM Go to last post
  24. 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 03:01 AM
    • Replies: 1
    • Views: 394
    07-30-2015, 06:25 AM Go to last post
  25. Moderating effects in structural equation models

    Hello, first, I want to apologize if I'm opening this thread in the wrong folder etc. I just registered here and I'm a bit confused still. I'm...

    Started by PSH‎, 07-30-2015 04:37 AM
    moderation, moderator, regression, sem
    • Replies: 0
    • Views: 423
    07-30-2015, 04:37 AM Go to last post
  26. Linear Regression with effect size changes of categorical variables with continuous

    I have three categorical variables (disked, herbicide, Lands) each is binomial (0,1). For example, within disked there is a group in which it does...

    Started by farre1pd‎, 07-27-2015 01:45 PM
    ancova, categorical, continuous, group differences
    • Replies: 3
    • Views: 503
    07-27-2015, 03:21 PM Go to last post
  27. Multiple mediation analysis

    I have a question about multiple mediation analysis. I had originally designed a study to see if four separate variables (M1, M2, M3 and M4) mediate...

    Started by B B Jinx‎, 07-20-2015 01:25 PM
    • Replies: 5
    • Views: 684
    07-27-2015, 09:32 AM Go to last post
  28. Ordinal predictor variable in regression

    When you have a nominal categorical predictor you just create dummies. With say a five level ordinal predictor (the classical case would be a likert...

    Started by noetsi‎, 07-26-2015 04:11 PM
    • Replies: 1
    • Views: 509
    07-26-2015, 06:51 PM Go to last post
  29. Correcting for endogeneity a panel count model with interactions using IV approach

    Hello dear forum members, My study examines the impact of online (a) reputational status, and (b) reviews on physicians’ performance, as proxied...

    Started by kiton‎, 07-25-2015 10:52 AM
    endogeneity, instrumental variables, interaction terms, panel count model
    • Replies: 0
    • Views: 420
    07-25-2015, 10:52 AM Go to last post
  30. 1)Test multicollinearity b4/after Stepwise Log Regress? 2)Final Equatn 3)Model Select

    Hi all, I need to perform logistic regression for my study. Pretty new to it but have read up on it and have tried it on SPSS. I would like to...

    Started by atomic_beans‎, 07-21-2015 12:49 AM
    logistic regression, model selection, multicollinearity, spss, stepwise
    • Replies: 8
    • Views: 1,125
    07-25-2015, 07:13 AM Go to last post
  31. Logistic Regression: how can I handle IVs which are correlated?

    Hello, I am planning to fit a Logistic Regression model (binary) and I would like to use (among several IVs) 4 predictors that turn out to suffer of...

    Started by gianmarco‎, 07-24-2015 03:19 AM
    • Replies: 7
    • Views: 736
    07-24-2015, 10:26 AM Go to last post
  32. Concerns with using a mix of Continuous and Categorical IVs in Logistic Regression?

    Before I get into it, I want to make clear that I'm not a statistics guy. I'm doing what I can to get through a thesis and stumbling my way forward....

    Started by OkieSpladle‎, 07-22-2015 01:33 PM
    • Replies: 7
    • Views: 671
    07-23-2015, 01:30 PM Go to last post
  33. Comparing probability scores from logistic models

    Hi, I want to be able to compare the probability scores from 2 different logistic regression models. I think it is not appropriate to directly...

    Started by msaifk‎, 07-23-2015 12:27 AM
    • Replies: 1
    • Views: 390
    07-23-2015, 08:08 AM Go to last post
  34. Linear regression alayses with interaction effect of two categorical variables

    Dear all, I have to run a linear regression analysis in SPSS with an interaction effect of two categorical variables: - Modality (audio,...

    Started by nadinv‎, 07-22-2015 05:12 PM
    regression
    • Replies: 3
    • Views: 546
    07-23-2015, 05:35 AM Go to last post
  35. Interaction between a time-varying and a time invariant variable? (Panel regression)

    Hi everyone, I have got a question regarding the specification of interaction effects in panel regressions (fixed effects within estimators). I...

    Started by numerator‎, 07-22-2015 08:44 AM
    interaction, moderation, panel, regression, time invariant
    • Replies: 1
    • Views: 711
    07-22-2015, 09:26 AM Go to last post
  36. Using residuals as predictors to adjust for effects of covariate in regression

    I was wondering if this is appropriate: I have two predictors that are highly correlated and collinear, x1 and x2, and are both associated with Y....

    Started by Disvengeance‎, 07-21-2015 03:14 PM
    • Replies: 4
    • Views: 632
    07-21-2015, 04:50 PM Go to last post
  37. Panel probit model (RE) -- inclusion of time invariant variables

    Hello forum members! Consider a panel probit model to be estimated (say, in Stata code): -xtprobit y x1 x2 x3 x4, re- where, y is binary...

    Started by kiton‎, 07-20-2015 07:07 PM
    • Replies: 0
    • Views: 455
    07-20-2015, 07:07 PM Go to last post
  38. Principal Component Analysis - global R2

    Hi, I've extracted the principal components from a set of k studentized variables. I can compute the cumulative R2.i.e the percentage of...

    Started by vm294‎, 07-20-2015 05:53 AM
    pca
    • Replies: 1
    • Views: 465
    07-20-2015, 11:49 AM Go to last post
  39. Reviewer questioning my regression in my article, need advice on how/what to respond

    Hi guys. Iíve submitted my first article and a reviewer is questioning my stats. I never had this problem before and I need your help! Quick...

    Started by nightale‎, 07-16-2015 04:57 PM
    • Replies: 13
    • Views: 863
    07-20-2015, 11:46 AM Go to last post
  40. Selecting Variables in Regression Analysis

    Hello, I am working on generating a regression analysis, but I am not sure if my setup is accurate. I would like to predict how long it will take...

    Started by mjgarrin‎, 07-17-2015 02:57 PM
    • Replies: 3
    • Views: 673
    07-20-2015, 08:55 AM Go to last post
  41. (SPSS) Linear Mixed Model?

    Dear all, I would appreciate any advice on the correct use of a Linear Mixed Model (in SPSS) A short description of the research Iím doing: In...

    Started by JdH‎, 07-18-2015 08:27 AM
    • Replies: 0
    • Views: 518
    07-18-2015, 08:27 AM Go to last post
  42. Finding Significant Difference between Linear Regressions

    Hello. I have a scatterplot with two different sets of data plotted. Each individual set has its own linear regression formula and R-squared...

    Started by danhageman‎, 07-17-2015 12:31 AM
    outlier detection, p-value, regression analysis, scatter plot, significance
    • Replies: 0
    • Views: 413
    07-17-2015, 12:31 AM Go to last post
  43. Exclamation How to use Likert Scale data in regression analysis?

    My knowledge about statistics is elementary and I would really appreciate some help or suggestions in solving my current problem. I am doing a...

    Started by irtiza104‎, 07-14-2015 04:40 PM
    • Replies: 9
    • Views: 1,724
    07-16-2015, 08:57 PM Go to last post
  44. Simple question : Understanding an interaction - Gender as a moderator

    I wanted to see if gender has a moderating effect on the interaction between the age at divorce and trust in relationships. I centered the age at...

    Started by Charlotte_‎, 07-12-2015 05:01 AM
    • Replies: 3
    • Views: 693
    07-15-2015, 04:57 PM Go to last post
  45. Preference Share + Regression

    I have conducted a conjoint survey evaluating several combinations of user and devices, with the end goal of calculating a preference share of each...

    Started by Julia18‎, 07-15-2015 03:35 PM
    • Replies: 5
    • Views: 550
    07-15-2015, 04:37 PM Go to last post
  46. Simple question - regression, order effects, experiment

    Hi there, I did a simple experiment whereby people in counterbalanced order received a measurement scale measuring their emotions and then...

    Started by Portland‎, 07-08-2015 02:52 PM
    • Replies: 2
    • Views: 744
    07-10-2015, 08:42 AM Go to last post
  47. Conducting a White's test in SPSS

    PLEASE anyone?? I'm really struggling here... Hi everyone, I've seen a tutorial on youtube on how to conduct a white's test in spss. I was...

    Started by Charlotte_‎, 07-10-2015 06:02 AM
    • Replies: 1
    • Views: 1,929
    07-10-2015, 06:44 AM Go to last post
  48. How to calculate sum of square of quadratic term

    Hi, I have obtain a quadratic model from central composite design (DOE) During ANOVA procedure I have some solution to compute "manualy" the...

    Started by luc38‎, 07-10-2015 06:03 AM
    anova table
    • Replies: 0
    • Views: 362
    07-10-2015, 06:03 AM Go to last post
  49. Creating predicted probabilities from a categorical IV in a logit (with syntax)

    So. I have a binary outcome that is begin predicted by a race IV which has 4 categories. here is my output: LOGISTIC REGRESSION VARIABLES...

    Started by jsayn‎, 07-09-2015 03:24 PM
    • Replies: 2
    • Views: 415
    07-09-2015, 07:10 PM Go to last post
  50. predictor 2 on the causal pathway between predictor 1 and outcome

    Hi: This is re-post of a something I put in the 'statistics' forum a while ago. There were 75 views but no responses, so I thought I try again in...

    Started by sigmundo‎, 07-08-2015 08:17 AM
    causal pathways
    • Replies: 5
    • Views: 492
    07-09-2015, 11:02 AM Go to last post
  51. Is it alright to use quantity as dependent variable in absence of price information?

    Good afternoon, My panel data set includes information about unit sales, sales volume and other figures but the wholesale/retail price. I'd like...

    Started by RUB‎, 07-09-2015 08:16 AM
    • Replies: 1
    • Views: 383
    07-09-2015, 10:49 AM Go to last post
  52. SAS GLIMMIX subject specific estimates

    I am trying to analyze a dataset where each subject has 12 repeated measures (quarterly, over 3 years). I want to extract subject specific estimates...

    Started by aisley‎, 07-08-2015 09:52 AM
    glimmix, longitudinal study, mixed effects model, negative binomial model, sas
    • Replies: 3
    • Views: 447
    07-08-2015, 02:41 PM Go to last post
  53. Corporate Governance Explanations effects on Firm Value

    Hi all, I'm quite new to statistics and need some guidance for my dissertation. The University is messing up with my supervisor resulting in me...

    Started by Vislian‎, 06-23-2015 10:54 AM
    • Replies: 1
    • Views: 684
    07-08-2015, 09:51 AM Go to last post
  54. Help creating my first logistic Regression model

    Hi everyone, I`m new here, and new in the stats world, and i have several questions and need for help on how to proceed. First, what i`m doing...

    Started by Perdido‎, 07-06-2015 10:29 AM
    • Replies: 8
    • Views: 1,247
    07-06-2015, 04:21 PM Go to last post
  55. Testing heteroscedasticity statistically

    Hi everyone, I conducted a Breush-Pagantest and it is unsignificant, so there is no heteroscedasticity. My residual plot however looks pretty...

    Started by Charlotte_‎, 07-06-2015 04:20 AM
    breush-pagan, white's test
    • Replies: 2
    • Views: 620
    07-06-2015, 05:05 AM Go to last post
  56. How to Handle Blank Fields in Multiple Linear Regression

    I am building a regression with 45 samples across 20+ independent variables. I am randomly selecting subsets of the variables and running many...

    Started by Ahmntz‎, 06-29-2015 09:24 AM
    blank fields, least squares regression, missing data, regression, regression analysis
    • Replies: 2
    • Views: 587
    07-02-2015, 02:32 PM Go to last post
  57. multivariate regression ?

    Hello everyone, I would like to check whether gross margin% is different in different segments. With segments I mean f.e. quantity, weight,...

    Started by pjlambrecht‎, 06-26-2015 01:40 AM
    • Replies: 3
    • Views: 685
    06-30-2015, 08:07 AM Go to last post
  58. Time series regression

    I am trying to learn how to conduct regression with time series data . I intend to use ARDL which is time series with autoregressive error with the...

    Started by noetsi‎, 06-29-2015 04:51 PM
    • Replies: 0
    • Views: 504
    06-29-2015, 04:51 PM Go to last post
  59. Determining the weight of variables

    I am trying to determine if one of the numbers in regression summary provide the weight of the important of each variable? Here is an example: ...

    Started by MikeDrohan‎, 06-26-2015 10:10 AM
    regression analysis
    • Replies: 4
    • Views: 453
    06-29-2015, 08:06 AM Go to last post
  60. Log

    Dear all, Im am doing an OLS regression. My dependent variable has large negative values, many zeros and large positive values. How can I...

    Started by Joanne Smith‎, 06-28-2015 07:00 AM
    • Replies: 4
    • Views: 566
    06-29-2015, 03:45 AM Go to last post

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