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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Finding the population mean from a sample

    For a quiz, the question I was given is "Estimate the mean weekly gross sales for all stores that spend $800 on direct mail advertising (Independent...

    Started by Thebluesclues‎, 03-31-2015 02:46 AM
    • Replies: 1
    • Views: 956
    03-31-2015, 09:12 AM Go to last post
  2. Timeseries: Evaluating Var models

    I have build some var models with different types of variables and now I want to try to evaluate them and see wich one is the best But when I look...

    Started by studentbelg‎, 03-30-2015 02:10 PM
    • Replies: 0
    • Views: 450
    03-30-2015, 02:10 PM Go to last post
  3. Logistic Regression model: a significant predicting variable with low sensitivity?

    Hi fellow forum members! Thank you in advance for your time! I used binary logistics regression (SPSS) to determine the relationship between...

    Started by VioV‎, 03-29-2015 07:25 PM
    continous variable, logistic regression, predictor, sensitivity, specificity
    • Replies: 1
    • Views: 716
    03-30-2015, 04:38 AM Go to last post
  4. Which test to use (f or t) to test the validity of Okun's Law

    Hello, I'm doing a simple linear regression on Okun's law and I need to do a statistical test on the validity of my model. I have two variables;...

    Started by econmajor123‎, 03-30-2015 12:59 AM
    • Replies: 0
    • Views: 337
    03-30-2015, 12:59 AM Go to last post
  5. How to compare 2 ORs from different regression models.

    I created a logistic regression model to predict an outcome of depression vs. no depression. There are several variables in the model including...

    Started by ResearchMaven‎, 03-29-2015 04:07 PM
    compare, logistic regression, odds ratio
    • Replies: 2
    • Views: 712
    03-29-2015, 09:32 PM Go to last post
  6. Panel data ??

    Hi, I want to knwo if an historic of 8 years is good enough for using the panel data model with 25 country ?

    Started by Ihssanee‎, 03-29-2015 04:48 PM
    • Replies: 0
    • Views: 484
    03-29-2015, 04:48 PM Go to last post
  7. Tolerable Serial Correlation/ Auto-Correlation by a Regression Analysis

    Hi, is there a similar rule for the tolerable serial correlation/ auto-correlation by a regression analysis like the maximum-minimum quotient...

    Started by consuli‎, 03-29-2015 03:31 PM
    • Replies: 0
    • Views: 437
    03-29-2015, 03:31 PM Go to last post
  8. Tolerable Heteroskedasticity/ Variance Inhomogenity

    Hello, a long time ago I have read somewhere, that a regression can overcome heteroskedasticity/ variance inhomogenity up to certain amount. It...

    Started by consuli‎, 03-26-2015 08:28 AM
    • Replies: 2
    • Views: 548
    03-29-2015, 03:23 PM Go to last post
  9. Question p value of the constant, can I ignore it?

    I'm analysing the influence of various factors on hare harvests in a specific are. E.g. How do the hare harvests change when the fox harvests...

    Started by sumie‎, 03-29-2015 10:44 AM
    p-value, regresion
    • Replies: 1
    • Views: 481
    03-29-2015, 11:31 AM Go to last post
  10. Discretization of a continuous variable

    He guys, I'm analyzing a research regarding patients and their risk factors for developing a certain side effect. If i enter age as a continous...

    Started by XPeriment‎, 03-26-2015 07:05 AM
    • Replies: 14
    • Views: 1,606
    03-28-2015, 10:53 AM Go to last post
  11. Confidence for pooled within group slope

    In SPSS simple linear regression one can get the confidence limits either side of the linear regression slope simply by ticking the "prediction...

    Started by Stephen19‎, 03-27-2015 12:13 PM
    • Replies: 2
    • Views: 559
    03-28-2015, 04:18 AM Go to last post
  12. Regression with several mediators

    Hello there :) Although this is connected to SPSS; I think this is the more appropriate place. Im making a linear regression and have several...

    Started by LtStarbuck‎, 03-25-2015 09:24 AM
    • Replies: 0
    • Views: 410
    03-25-2015, 09:24 AM Go to last post
  13. Approaches for multivariate nonlinear parametric regression?

    I have some data that is nonlinear, but is curvilinear. It is two factors and a dependent variable. Each factor has a pretty good fit when applying a...

    Started by stevehollx‎, 03-24-2015 01:50 PM
    • Replies: 1
    • Views: 540
    03-24-2015, 07:45 PM Go to last post
  14. Logistic regression using dummies with dependent "holes"

    Hi, I'm trying to do do a logistic regression using R. I want to regress using binary dependent variable Y as granted or not grated (1 or 0)...

    Started by Elekko‎, 03-24-2015 07:15 PM
    dummy variable, interactive dummy, logistical regresion, missing value
    • Replies: 0
    • Views: 392
    03-24-2015, 07:15 PM Go to last post
  15. Controlling mediation effect in a binary logistic regression

    Hi everbody, It's my first post and I hope I posted in the right forum. In my master thesis I use binary logistic regression: a dichotomous...

    Started by Frodofroehlich‎, 03-24-2015 02:19 PM
    • Replies: 2
    • Views: 789
    03-24-2015, 04:14 PM Go to last post
  16. Generalized Linear Mixed Models without mixed effects. A meaningless question?

    Hi there, I know what fixed and random effects in linear models or GLM are. I am using Generalized Linear Mixed Models (GLMM) to handle this. So...

    Started by eric1708‎, 03-23-2015 10:00 AM
    fixed effect, glmm, random effect, terminology
    • Replies: 3
    • Views: 582
    03-23-2015, 10:02 PM Go to last post
  17. MLE and vector generalized linear models

    Hello and thank you very much for your time I am working to simultaneously (multivariate) regress 'A' and 'B' parameters from matched observations...

    Started by smalley2‎, 03-23-2015 04:38 PM
    • Replies: 0
    • Views: 419
    03-23-2015, 04:38 PM Go to last post
  18. relation within Gauss-Newton method for minimization

    If we study model fit on a nonlinear regression model Y_i=f(z_i,\theta)+\epsilon_i, i=1,...,n, and in the Gauss-Newton method, the update on...

    Started by ianchenmu‎, 03-23-2015 01:02 PM
    optimization
    • Replies: 0
    • Views: 390
    03-23-2015, 01:02 PM Go to last post
  19. Panel Data Model. Problem !

    Hi everyone, First, Ihave to mention that I am newbie in statistic so I may have some evident questions ! Actually, I am working on a...

    Started by Ihssanee‎, 03-23-2015 11:29 AM
    • Replies: 2
    • Views: 481
    03-23-2015, 12:51 PM Go to last post
  20. Multiple regression: one of my significant factors has outliers, what should I do?

    So I ran a multiple regression and found two factors that explained one of my dependent variables quite well. The problem is that one of the two...

    Started by battlepope‎, 03-19-2015 10:18 PM
    • Replies: 2
    • Views: 761
    03-22-2015, 08:29 AM Go to last post
  21. Two linear regressions or one moderated multiple regression?

    Hi everyone, I would REALLY appreciate any help on this since I've exhausted a lot of options for help already. I have a set of a data with...

    Started by mxw‎, 03-20-2015 05:10 PM
    • Replies: 6
    • Views: 906
    03-21-2015, 05:42 PM Go to last post
  22. [Log.reg.] Can I include confounder that does not have all categories of exposure?

    Hello. I am working on a thesis in public health science, and am stuck until this current problem i solved. Your help will be highly appreciated! ...

    Started by kristian‎, 03-21-2015 05:51 AM
    • Replies: 0
    • Views: 493
    03-21-2015, 05:51 AM Go to last post
  23. Question Weighted Regression

    I have a few questions in regards to setting up and running my weighted regression: Firstly, some background. I am comparing point of subjective...

    Started by JackFarr‎, 02-14-2015 08:28 AM
    pse, regression, sem, weighted
    • Replies: 1
    • Views: 740
    03-17-2015, 11:36 PM Go to last post
  24. Hierarchical regression in SPSS (how to enter interactions when you have a quadratic)

    Hello there! I want to confirm if I am entering my variables in the proper way in SPSS for multiple regression. I have four variables: 1) student...

    Started by tropie‎, 03-17-2015 03:04 PM
    hierarchical regression, quadratic, regression analysis
    • Replies: 3
    • Views: 901
    03-17-2015, 04:32 PM Go to last post
  25. How do I select a method of regression analysis - Allometry - Animal Growth - Gnu

    I am analysing the growth of the wildebeest or gnu. To do this I am comparing the changes in A: Body length (L), B: Girth (G) and C: Shoulder height...

    Started by Gnu‎, 03-16-2015 10:21 AM
    allometry, anatomy, biology, growth, regression
    • Replies: 2
    • Views: 728
    03-17-2015, 02:04 AM Go to last post
  26. 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 05:25 PM
    interaction, lagged variable
    • Replies: 1
    • Views: 621
    03-16-2015, 06:04 PM Go to last post
  27. log-lin regression vs lin-lin

    Hi guys, I'm a new guest in this forum so first of all I'm Giovanni and nice to meet you. I'm solving a problem set of Econometrics course and...

    Started by gionni25‎, 03-15-2015 11:23 AM
    • Replies: 2
    • Views: 1,228
    03-16-2015, 04:24 AM Go to last post
  28. pooled OLS regression - industry dummy coefficients higher than the rest

    Please delete this thread. I did not find the button to delete it. Thanks a lot Best Mat

    Started by Mat_Latter‎, 03-15-2015 04:15 AM
    • Replies: 0
    • Views: 493
    03-15-2015, 04:15 AM Go to last post
  29. Post Difference between two regression coefficients

    Hi All: This is the context. I have three x variables with following relationship: x1 + x2 = x3. Now, I run these two equations: y = a1 + b1x1...

    Started by hs2000‎, 03-12-2015 10:01 PM
    • Replies: 1
    • Views: 606
    03-13-2015, 09:18 AM Go to last post
  30. Question Correct statistical test to use for my data (correlation/regression)

    Hello everyone, Potentially a silly question (but I am new to all of this): I have collected data from a focal animal study on Naked mole-rats....

    Started by Naked.Mole.Rat‎, 03-13-2015 07:13 AM
    • Replies: 0
    • Views: 469
    03-13-2015, 07:13 AM Go to last post
  31. Interpreting coefficients from GLM output

    Hi, I'm trying to educate myself further on using GLM and to do so I figured it'd be easiest to conduct a simple experiment where I knew the...

    Started by schwartzaw‎, 03-04-2015 10:23 AM
    • Replies: 9
    • Views: 1,320
    03-12-2015, 01:54 AM Go to last post
  32. Multi-Level Model

    Why in multi-level models can you get away with fewer observations per predictors? I know that I have heard and seen this before, but I am not...

    Started by hlsmith‎, 12-09-2014 08:57 AM
    • Replies: 9
    • Views: 1,221
    03-11-2015, 12:56 PM Go to last post
  33. Variance of parts equal to variance of whole?

    Good morning, I ran a hierarchical regression to test if variables A and B (established in the literature) are mediated by variable C (my research...

    Started by Monash_RA‎, 03-09-2015 07:37 PM
    dependent variables, explained variance, hierarchical regression, mediation analysis, multiple regression
    • Replies: 0
    • Views: 624
    03-09-2015, 07:37 PM Go to last post
  34. Interpretting Negative Beta Co-efficients in Regression

    Hi there, I am having trouble interpreting negative beta co-efficients. I think I am missing something simple perhaps... I have run a...

    Started by a_living_stone‎, 03-07-2015 02:54 AM
    • Replies: 1
    • Views: 679
    03-08-2015, 01:18 AM Go to last post
  35. Statistics Regression Question

    I need help with this question! The graph is in the picture below! A popular, nationwide standardized test taken by high-school juniors and...

    Started by zolton5971‎, 03-05-2015 09:56 AM
    • Replies: 5
    • Views: 1,314
    03-07-2015, 02:40 PM Go to last post
  36. Simple regression model but needs improvement

    I have been working on trying to fit a linear regression line to try to predict college gpa where the the prediction variables are high school...

    Started by raidernation‎, 03-07-2015 12:04 PM
    • Replies: 0
    • Views: 575
    03-07-2015, 12:04 PM Go to last post
  37. Multiple logistic regression - need for interaction checking?

    Hello, and thank you for reading this post. I am a medical doctor with limited statistical knowledge, so bare with me... I am trying to answer...

    Started by jujufish‎, 02-24-2015 09:37 AM
    interactions, multiple regression
    • Replies: 3
    • Views: 789
    03-07-2015, 08:07 AM Go to last post
  38. unit price of total pris?

    Hi, I am a first year economic student and are having some fun with regressions. I am doing a a regression analyse of some example data I have...

    Started by bodesmiller‎, 03-05-2015 05:05 AM
    • Replies: 0
    • Views: 524
    03-05-2015, 05:05 AM Go to last post
  39. Which multilevel approach is the right one? Help needed choosing a method.

    Hi everyone, I have a data set with a very specific structure and I am looking for a suitable way to analyze it. To be more precise, I am...

    Started by numerator‎, 03-04-2015 06:47 PM
    multilevel model, nested structure
    • Replies: 0
    • Views: 592
    03-04-2015, 06:47 PM Go to last post
  40. Help with interaction terms

    Hi, I have two categorical variables (race and field of study) as a part of my model to predict degree completion. In addition to the original model,...

    Started by commuter1112‎, 03-04-2015 01:08 PM
    • Replies: 1
    • Views: 616
    03-04-2015, 03:58 PM Go to last post
  41. Help with interactions in regression

    Hi I would really appreciate if anyone could please help me with this. I am doing a regression analysis, looking at the effect of 2 drugs (A or B)...

    Started by Bio_Stat‎, 03-03-2015 07:42 PM
    • Replies: 3
    • Views: 622
    03-04-2015, 08:19 AM Go to last post
  42. Binary Logistic Regression- SPSS Output

    Dear TalkStats Forum, I am currently looking into a data-set which measures previous cyber-crime victimization as well as whether the participants...

    Started by Dulusu‎, 03-02-2015 09:36 AM
    • Replies: 1
    • Views: 454
    03-03-2015, 03:58 PM Go to last post
  43. Interpreting Coefficients in Mediation Analysis with Logged Variables

    Hello out there. I really hope u can help me because i've tried to find a solution to my problem for ages now.. im performing a mediation analysis...

    Started by loop‎, 03-03-2015 05:22 AM
    • Replies: 0
    • Views: 606
    03-03-2015, 05:22 AM Go to last post
  44. transform probit into logit

    Hi everyone, is there a way to transform results obtained from a probit regression into results obtained from a logit regression? I am looking for...

    Started by natoe‎, 03-02-2015 04:06 AM
    • Replies: 1
    • Views: 637
    03-02-2015, 04:21 AM Go to last post
  45. Question About Excluded Variable

    Hi,please help me. I'm working on a thesis to determine the effect of independent variables(four independent variables, denoted by X1,X2,X3 and X4)...

    Started by muridbertanya‎, 03-01-2015 09:26 PM
    • Replies: 0
    • Views: 688
    03-01-2015, 09:26 PM Go to last post
  46. statistical tool/program for obtaining stiffness properties by force-deflection data

    I am performing flexural testing of composite honeycomb sandwich panels as per D7250,desired deliverables(stiffness values G,U and D) are obtained...

    Started by Brook79‎, 03-01-2015 11:42 AM
    • Replies: 0
    • Views: 653
    03-01-2015, 11:42 AM Go to last post
  47. Dependent variable is function of itself

    I have a model: qty=a.price+....(other IVs) Price is calculated as sales_amount/qty. Hence for a customer, if we aggregate data of a certain...

    Started by abhik‎, 02-27-2015 01:17 PM
    • Replies: 2
    • Views: 805
    02-27-2015, 08:55 PM Go to last post
  48. R-Squared Change - Multivariate Multiple Regression

    Hello everyone, I've been asked to conduct a multivariate multiple regression with multiple DVs (3 measures of a dependence construct) predicted...

    Started by trujilloma‎, 02-25-2015 07:34 PM
    multivariate regression, r squared change
    • Replies: 0
    • Views: 727
    02-25-2015, 07:34 PM Go to last post
  49. Non-linearity in OLS-Models, Multinominal Logit-Regression

    Hey there, I have a question connected to the Ols-Model in case of nonlinearity between parameters. What should be done if the assummption of...

    Started by looop‎, 02-15-2015 03:22 PM
    multinomial logit, non-linear, ols regression, regression assumption
    • Replies: 2
    • Views: 645
    02-25-2015, 12:49 PM Go to last post
  50. Hot to analyze data at various levels (company and employee)?

    I have a data set with data at two different levels. I want to analyze the perceptions of employees of a specific management practice. The data...

    Started by DrJames‎, 02-20-2015 06:19 PM
    • Replies: 1
    • Views: 650
    02-25-2015, 12:45 PM Go to last post
  51. meta analysis of many regression studies

    Ive searched the forum for answers to this but no joy yet so please help if you can. I have about 30 published studies looking at the dependence...

    Started by andyspeak‎, 02-17-2015 06:17 AM
    • Replies: 9
    • Views: 1,689
    02-25-2015, 05:31 AM Go to last post
  52. Question Discrepancy between Geogrebra, Excel, Desmos, and TI-83 PLUS...what's the deal?

    As my title implies, there is a discrepancy between Geogebra, Excel, Desmos, and TI-83 Plus. Let me explain myself I have created a fifth and...

    Started by nddn‎, 02-21-2015 03:19 PM
    • Replies: 3
    • Views: 987
    02-21-2015, 08:09 PM Go to last post
  53. Checking homoscedasticity in repeated measures

    Hello, When checking the assumption of constant variance for repeated measures data, am I correct in thinking that the variance of residuals...

    Started by deeuu‎, 02-18-2015 11:36 AM
    homoscedasticity, regression assumption
    • Replies: 0
    • Views: 661
    02-18-2015, 11:36 AM Go to last post
  54. Smile Conditional logistic regression- effect of modifiers

    Hi everybody, I am new here in this forum. I am studying the effect of air pollution (PM) on health outcomes, and the characteristics that might...

    Started by AlinaVo‎, 02-18-2015 03:18 AM
    case control; matched, coefficients, conditional regression
    • Replies: 0
    • Views: 525
    02-18-2015, 03:18 AM Go to last post
  55. Multiple regression where only part of the sample completed the follow up survey

    Hi, For my dissertation I trying to determine whether several emotions predict behavioural intention and behaviour. Participants were asked to...

    Started by Chris12‎, 02-16-2015 03:33 PM
    • Replies: 0
    • Views: 489
    02-16-2015, 03:33 PM Go to last post
  56. Interaction between binary and continuous variable in OLS

    I am trying to examine the association between maternal education and child school test scores using the following equation. TestScore = β0 + β1...

    Started by monzur‎, 02-16-2015 12:02 AM
    interaction effect, ols regression
    • Replies: 3
    • Views: 928
    02-16-2015, 08:09 AM Go to last post
  57. Regression / modelling help

    Hi All, I'm new here so If I've posted this in the wrong place or its not practical then I apologise. I'm new to regression so helpfully Im...

    Started by bobastic‎, 01-14-2015 05:44 PM
    • Replies: 5
    • Views: 1,403
    02-15-2015, 08:45 PM Go to last post
  58. 2sls regression

    hi, what be the consequenses of using the same explanatory variables in a simultaneous equations system? for example if both the supply and the...

    Started by bodesmiller‎, 02-15-2015 11:51 AM
    • Replies: 0
    • Views: 597
    02-15-2015, 11:51 AM Go to last post
  59. regression analysis reporting: chemist needs help!

    Hello, everyone. We have some regression data we'd like to report, but aren't sure how to best do so. Here's the situation: A lab analyst runs a...

    Started by artie mckim‎, 02-15-2015 10:28 AM
    • Replies: 0
    • Views: 491
    02-15-2015, 10:28 AM Go to last post
  60. how to draw a logistic curve in word, excel etc

    Hello, I am working on a binary logistic regression and would like to insert the logistic sigmoid curve. do you know how to draw such a curve in...

    Started by t.wang21@yahoo.com.au‎, 02-14-2015 08:32 PM
    • Replies: 0
    • Views: 893
    02-14-2015, 08:32 PM Go to last post

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