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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Website Visits and Marketing Spend and their correlation with Sales

    Hello, My company wants to find a correlation between website visits and marketing spend between sales. Essentially, are website visits or spend a...

    Started by Leandro‎, Yesterday 07:11 PM
    • Replies: 0
    • Views: 56
    Yesterday, 07:11 PM Go to last post
  2. Regression and imputing zeros

    Hi all! I have what is likely a simple regression problem. I am imputing Variable X from survey Y to survey Z. I am using a simple linear...

    Started by domwebber‎, Yesterday 03:55 AM
    hotdeck, imputation, linear regression, stata 12
    • Replies: 0
    • Views: 51
    Yesterday, 03:55 AM Go to last post
  3. Help with multiple regression and spark/spss

    Hello, I am trying to create a program in spark that will run a multiple regression for my master's dissertation. I am using the standard formula...

    Started by spinecho‎, Yesterday 03:24 AM
    • Replies: 0
    • Views: 40
    Yesterday, 03:24 AM Go to last post
  4. Regression w/ dummy variables

    I'm looking to conduct regression analysis using three dummy variables for independent variables: (1) ethnicity, (2) GLOBE category (i.e. country of...

    Started by tedmitt‎, 08-27-2015 09:26 PM
    • Replies: 0
    • Views: 68
    08-27-2015, 09:26 PM Go to last post
  5. How to regress data

    Hi, I would like to do a simple regression one variable on a dependent variable. Specifically, I would like to regress a financial ratio such as ROE...

    Started by StatisticsNewbie12‎, 08-27-2015 12:59 PM
    • Replies: 0
    • Views: 68
    08-27-2015, 12:59 PM Go to last post
  6. Regression analysis for the influence one result has on the results of another test

    Hi There, My name is Jordan and Iím a physiotherapist working in London. I have taken over study from a colleague and have been given the data...

    Started by jordanwb‎, 08-27-2015 08:15 AM
    • Replies: 0
    • Views: 80
    08-27-2015, 08:15 AM Go to last post
  7. Setting an experiment with ordered categories as predictors

    I am trying to apply a multi-factorial regression analyses on a model with 4 different predictors each of which can have four different weights as...

    Started by Ines77‎, 08-26-2015 03:16 PM
    categorical predictors, categorical variables, regression analysis
    • Replies: 1
    • Views: 119
    08-26-2015, 03:52 PM Go to last post
  8. Is GLM to best for my data

    Hello I want to look at abundance of fleas on their hosts, so there are zero counts. I have looked and found that GLM with family = poisson and...

    Started by Pippy34‎, 08-26-2015 01:01 AM
    • Replies: 2
    • Views: 109
    08-26-2015, 01:48 PM Go to last post
  9. Regressional on likert scale data using spss

    Hi guys, I am in a fix!!:confused:. My questionnaires have recently been filled but am yet to figure out how to analyze my data. My topic is "impact...

    Started by thega‎, 04-04-2011 06:59 AM
    • Replies: 2
    • Views: 4,142
    08-26-2015, 08:56 AM Go to last post
  10. Alternative for a multi-level analysis

    Hi all, For my criminology thesis I am analysing police interviews and would like to research the effect (the presence of) an attorney has on...

    Started by Aeleanor‎, 08-25-2015 08:15 AM
    analysis, logistic, multi-level, nested, regression
    • Replies: 1
    • Views: 109
    08-25-2015, 10:13 AM Go to last post
  11. Interpreting my regression results

    Hi all, i'm running a panel regression using stata. i wanted to test whether there are indeed region fixed effects (FE) that reside in my data...

    Started by proby2‎, 08-23-2015 04:05 PM
    • Replies: 0
    • Views: 147
    08-23-2015, 04:05 PM Go to last post
  12. Exclamation Multiple Regression: 3 levels in IV of interest, how to compare between all 3?

    Hi all, I would like to test the following and am hoping to get some assistance as I am new to regression: DV - Brain volume IV - Participant...

    Started by michikoc‎, 08-22-2015 11:52 PM
    ancova, multiple regression, regression
    • Replies: 0
    • Views: 138
    08-22-2015, 11:52 PM Go to last post
  13. Fixed effect Model

    dear all, I am having problems with the fixed effect model. In a nutshell, I am analysing the impact of disasters within families with regard...

    Started by Heike C.‎, 08-22-2015 08:08 AM
    • Replies: 0
    • Views: 112
    08-22-2015, 08:08 AM Go to last post
  14. Hierarchical regression for a complex model

    So I am testing my own model but it is more complex than I have dealt with before. I know I need hierarchical regression, and I'm using SPSS (I have...

    Started by cp349‎, 08-21-2015 03:45 PM
    hierarchical, mediators, model, moderators, regression
    • Replies: 0
    • Views: 109
    08-21-2015, 03:45 PM Go to last post
  15. Regression to the mean for discrete non normal data

    Hello At work an initiative was started that attempted to reduce the number of Emergency department attendances by frequent users. I have a set...

    Started by MrScotchpie‎, 08-21-2015 07:59 AM
    • Replies: 1
    • Views: 156
    08-21-2015, 02:09 PM Go to last post
  16. Logistic Regression

    Hello, I'm currently working on a churn modelling exercise that uses logistic regression. The challenge that i'm facing now is that the model is...

    Started by JustinG‎, 08-20-2015 03:34 AM
    churn, logistic regression, predictive analysis, sample
    • Replies: 2
    • Views: 153
    08-21-2015, 04:11 AM Go to last post
  17. Variation of Gauss - Markov theorem

    Hi all, I was wondering what happens to the proof and the results of the Gauss - Markov theorem, if one hypothesis is changed and so if the...

    Started by StatsFX‎, 08-19-2015 10:13 AM
    • Replies: 0
    • Views: 110
    08-19-2015, 10:13 AM Go to last post
  18. 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 05:44 AM
    • Replies: 4
    • Views: 382
    08-16-2015, 01:37 PM Go to last post
  19. 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 04:12 PM
    • Replies: 3
    • Views: 269
    08-16-2015, 11:16 AM Go to last post
  20. 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: 109
    08-16-2015, 09:42 AM Go to last post
  21. 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 01:46 AM
    difference in difference, difference-in-difference, ols, ols regression, regression
    • Replies: 0
    • Views: 127
    08-16-2015, 01:46 AM Go to last post
  22. 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 08:38 PM
    • Replies: 1
    • Views: 141
    08-13-2015, 09:54 PM Go to last post
  23. 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 05:22 AM
    • Replies: 7
    • Views: 215
    08-12-2015, 07:21 AM Go to last post
  24. 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 06:17 AM
    aic bic, model selection
    • Replies: 1
    • Views: 135
    08-12-2015, 06:35 AM Go to last post
  25. 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 10:36 AM
    missing data, regression model
    • Replies: 1
    • Views: 128
    08-10-2015, 03:33 PM Go to last post
  26. 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 10:11 AM
    • Replies: 0
    • Views: 112
    08-10-2015, 10:11 AM Go to last post
  27. 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 10:42 PM
    • Replies: 0
    • Views: 174
    08-06-2015, 10:42 PM Go to last post
  28. 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 08:10 AM
    • Replies: 0
    • Views: 184
    08-06-2015, 08:10 AM Go to last post
  29. 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 06:43 AM
    • Replies: 1
    • Views: 186
    08-06-2015, 03:04 AM Go to last post
  30. 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 08:16 AM
    • Replies: 2
    • Views: 381
    08-04-2015, 05:15 PM Go to last post
  31. 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 10:03 AM
    • Replies: 9
    • Views: 234
    08-04-2015, 04:54 PM Go to last post
  32. Contribution of multiple correlated effects on global observation

    Hello, In a perfect system, I have 0% of signal loss. I found that there are N effects that can contribute to signal loss. I activate each effect...

    Started by Cab‎, 08-04-2015 08:58 AM
    • Replies: 6
    • Views: 208
    08-04-2015, 01:49 PM Go to last post
  33. 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 02:33 AM
    • Replies: 1
    • Views: 137
    08-04-2015, 03:39 AM Go to last post
  34. 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 07:45 PM
    • Replies: 0
    • Views: 198
    08-01-2015, 07:45 PM Go to last post
  35. 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 01:03 PM
    • Replies: 4
    • Views: 301
    08-01-2015, 03:28 AM Go to last post
  36. 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 10:41 AM
    • Replies: 6
    • Views: 197
    08-01-2015, 02:28 AM Go to last post
  37. 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 06:57 PM
    • Replies: 0
    • Views: 160
    07-31-2015, 06:57 PM Go to last post
  38. 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 12:58 PM
    • Replies: 3
    • Views: 194
    07-31-2015, 06:21 PM Go to last post
  39. 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 05:12 PM
    • Replies: 8
    • Views: 381
    07-31-2015, 09:22 AM Go to last post
  40. 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 07:43 AM
    • Replies: 2
    • Views: 106
    07-30-2015, 08:06 AM Go to last post
  41. 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 12:40 PM
    • Replies: 7
    • Views: 310
    07-30-2015, 07:45 AM Go to last post
  42. 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: 143
    07-30-2015, 05:25 AM Go to last post
  43. 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 03:37 AM
    moderation, moderator, regression, sem
    • Replies: 0
    • Views: 119
    07-30-2015, 03:37 AM Go to last post
  44. 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 12:45 PM
    ancova, categorical, continuous, group differences
    • Replies: 3
    • Views: 181
    07-27-2015, 02:21 PM Go to last post
  45. 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 12:25 PM
    • Replies: 5
    • Views: 241
    07-27-2015, 08:32 AM Go to last post
  46. 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 03:11 PM
    • Replies: 1
    • Views: 175
    07-26-2015, 05:51 PM Go to last post
  47. 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 09:52 AM
    endogeneity, instrumental variables, interaction terms, panel count model
    • Replies: 0
    • Views: 199
    07-25-2015, 09:52 AM Go to last post
  48. 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, 07-20-2015 11:49 PM
    logistic regression, model selection, multicollinearity, spss, stepwise
    • Replies: 8
    • Views: 457
    07-25-2015, 06:13 AM Go to last post
  49. 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 02:19 AM
    • Replies: 7
    • Views: 262
    07-24-2015, 09:26 AM Go to last post
  50. 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 12:33 PM
    • Replies: 7
    • Views: 275
    07-23-2015, 12:30 PM Go to last post
  51. 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, 07-22-2015 11:27 PM
    • Replies: 1
    • Views: 144
    07-23-2015, 07:08 AM Go to last post
  52. 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 04:12 PM
    regression
    • Replies: 3
    • Views: 195
    07-23-2015, 04:35 AM Go to last post
  53. 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 07:44 AM
    interaction, moderation, panel, regression, time invariant
    • Replies: 1
    • Views: 145
    07-22-2015, 08:26 AM Go to last post
  54. 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 02:14 PM
    • Replies: 4
    • Views: 200
    07-21-2015, 03:50 PM Go to last post
  55. adding skewness and kurtosis to CAPM - regression

    Suppose I have a set of monthly returns of a stock, monthly 'market' returns and some risk free rate for lets say 10 years. Performing an usually OLS...

    Started by Deusdeorum‎, 07-21-2015 03:55 AM
    capm, regression analysis
    • Replies: 0
    • Views: 153
    07-21-2015, 03:55 AM Go to last post
  56. 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 06:07 PM
    • Replies: 0
    • Views: 149
    07-20-2015, 06:07 PM Go to last post
  57. 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 04:53 AM
    pca
    • Replies: 1
    • Views: 189
    07-20-2015, 10:49 AM Go to last post
  58. 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 03:57 PM
    • Replies: 13
    • Views: 433
    07-20-2015, 10:46 AM Go to last post
  59. 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 01:57 PM
    • Replies: 3
    • Views: 385
    07-20-2015, 07:55 AM Go to last post
  60. (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 07:27 AM
    • Replies: 0
    • Views: 199
    07-18-2015, 07:27 AM Go to last post

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