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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Combining variables prior to performing regression analysis

    Hello to all. I am running a regression analysis to evaluate if the joint analysis of costs and benefits can explain medicinal plant selection better...

    Started by patri‎, 05-04-2015 05:20 PM
    combining variables, linear regression, multiple regression, simple regression
    • Replies: 3
    • Views: 1,047
    05-08-2015, 05:01 PM Go to last post
  2. Regression Excel Output - Missing Values

    Hey guys, I've attached a screen shot of the table we have to use for my stats final. This is what we had on the midterm earlier this semester...

    Started by schmitam12‎, 05-08-2015 09:06 AM
    • Replies: 0
    • Views: 795
    05-08-2015, 09:06 AM Go to last post
  3. Question creating a statistical Analysis for treatment validation with placebo cond.

    Hi there, promising board of infinite knowledge, 1. Randomizing the Conditions This is what I want to do. One individual, two conditions. ...

    Started by LeeFX‎, 05-08-2015 05:03 AM
    • Replies: 0
    • Views: 575
    05-08-2015, 05:03 AM Go to last post
  4. One observation per factor level combination in regression

    Hi... I was wondering if you can perform multiple linear regression with a mix of categorical and quantitative variables, if you only have one...

    Started by twotone4‎, 05-07-2015 02:23 PM
    factor, multiple regression, prediction, regression
    • Replies: 2
    • Views: 782
    05-07-2015, 09:46 PM Go to last post
  5. Post Help with interpreting results of a bivariate probit regression please

    I have recently run this regression using Stata and the command biprobit. However, I am a complete newbie to statistics and I need some help...

    Started by jemma‎, 05-07-2015 02:47 AM
    • Replies: 0
    • Views: 1,071
    05-07-2015, 02:47 AM Go to last post
  6. Linear Regression - Influence of experience on wage

    Hello Talk-Stats-Members, i am new to the forum and already have a (in my eyes) complex theoretical problem that i hope you can help me with. I...

    Started by Michael_‎, 05-05-2015 02:37 PM
    • Replies: 4
    • Views: 956
    05-06-2015, 03:30 PM Go to last post
  7. Interpreting PROCESS Output

    Hi everyone, Does anyone know of any good resources to help interpret the process macro output, specifically for model 14? I have the book but it...

    Started by ck926‎, 05-06-2015 09:48 AM
    • Replies: 3
    • Views: 2,289
    05-06-2015, 10:11 AM Go to last post
  8. [SPSS - Logistic Regression] Resolve the linearity of logit assumption

    I am running a logistic regression and my income variable violates the linearity of the logit assumption. It is not negatively effecting the...

    Started by kdiallo11‎, 05-02-2015 03:37 PM
    linearity of logit, logistic regression, regression assumption
    • Replies: 3
    • Views: 2,957
    05-06-2015, 08:42 AM Go to last post
  9. RESET test Statistic

    Below is my question - I've never done a RESET calculation before so just seeking some guidance on how to start. I believe I need to add a quadratic...

    Started by dingo007‎, 05-05-2015 08:21 PM
    • Replies: 1
    • Views: 782
    05-05-2015, 10:13 PM Go to last post
  10. Thumbs up Normally/non-normally distributed data - initial significance testing

    Hi all, I would be grateful if anyone can direct me please. I am looking to 1. look at predictors of my DV (when controlling for confounders)...

    Started by HT3‎, 05-04-2015 11:23 AM
    • Replies: 1
    • Views: 573
    05-04-2015, 04:39 PM Go to last post
  11. optimal sample size

    I'm performing a regression analysis (OLS) and I have the luxury that my sample size is very high (5.000 observations) compared to the number of...

    Started by surveyman‎, 05-01-2015 04:27 AM
    • Replies: 6
    • Views: 953
    05-04-2015, 11:25 AM Go to last post
  12. Red face how to control foe age-wave1 when running a mixed model analysis

    Hi guys, I am running a linear mixed model in SPSS. My research question is: Does a reward-related personality trait at baseline predict weight...

    Started by fernandamata‎, 05-01-2015 06:57 PM
    mixed-model
    • Replies: 0
    • Views: 618
    05-01-2015, 06:57 PM Go to last post
  13. P-Values equal to zero

    Hi, I am running simple OLS regressions on forward and spot price data and have been getting p-values equal to exactly 0 (i.e. not 0.0000000234) for...

    Started by harleystats‎, 04-30-2015 09:56 PM
    p value, p values
    • Replies: 1
    • Views: 840
    04-30-2015, 10:05 PM Go to last post
  14. How to separate categorical variables in modeling

    Suppose I have a dataset as follows: Product Week Type Num times ad shown Purchases 1 2/2/13 young,old,hipster ...

    Started by lord12‎, 04-30-2015 10:32 AM
    • Replies: 0
    • Views: 565
    04-30-2015, 10:32 AM Go to last post
  15. Probit Regresion

    Hi all. What does categ.(factors) and count data mean in probit regression? Categ.(factors) mean covariate or something like that?

    Started by chivasrom‎, 04-30-2015 07:23 AM
    • Replies: 2
    • Views: 861
    04-30-2015, 07:51 AM Go to last post
  16. Logistic Regression: Classification table vs. Chi-square?

    Hello, I'm using binary logistic regression for my bachelor thesis (psychology). My problem is that the classification table does not change...

    Started by kazu‎, 03-27-2013 05:51 AM
    • Replies: 5
    • Views: 3,919
    04-30-2015, 04:31 AM Go to last post
  17. How can you deal with categorical variables that aren't present in your training set?

    Let's say I have the following linear regression: earnings = c0 + age * c1 + male * c2 where "male" is a categorical variable and "female" is...

    Started by billybass‎, 04-29-2015 06:24 PM
    • Replies: 1
    • Views: 895
    04-30-2015, 02:37 AM Go to last post
  18. Comparing two linear regression gradients?

    Hi, I am completely new to linear regression so this may sound daft, but I'm wondering if its possible to test for a significant difference between...

    Started by becread95‎, 04-25-2015 08:24 AM
    • Replies: 6
    • Views: 3,191
    04-29-2015, 09:08 AM Go to last post
  19. Comparing Models

    Today I was going to attempt to figure out and write some SAS code to compare nested linear models (variance explained). But I need some basics...

    Started by hlsmith‎, 04-28-2015 09:12 AM
    • Replies: 8
    • Views: 1,173
    04-28-2015, 01:31 PM Go to last post
  20. multilevel modelling: predicting random effects for new clusters

    Hi: I have a query I'm hoping someone may be able to help with. I've chatted to a few people and looked at texts and the literature but haven't...

    Started by sigmundo‎, 04-24-2015 05:06 AM
    • Replies: 9
    • Views: 1,813
    04-28-2015, 11:13 AM Go to last post
  21. Dealing with violations of the assumptions.

    I thought I had this covered in detail, but if so I apparently lost it. When you discover you have non-normal residuals the first suggestion is...

    Started by noetsi‎, 04-21-2015 03:51 PM
    2 Pages
    1 2
    • Replies: 28
    • Views: 3,080
    04-28-2015, 07:47 AM Go to last post
  22. Interpret continuous variables in binary regression model

    I have produced three binary regression models, each showing the odds ratios (ORs) for an outcome (attendance versus non-attendance) Each...

    Started by jle‎, 04-26-2015 09:38 PM
    • Replies: 7
    • Views: 913
    04-28-2015, 01:58 AM Go to last post
  23. Difference-in-Differences(Evaluate effect of a policy implemented gradually)

    Hi I have to do a diff-in-diff estimator in order to evaluate the impact of the policy. The problem is that the policy is gradually implemented...

    Started by adrift‎, 04-25-2015 07:15 PM
    • Replies: 0
    • Views: 697
    04-25-2015, 07:15 PM Go to last post
  24. Problem with interpretation of regression coefficients

    Hi, I have problem with interpretation of regression coefficients. My regression function is: y = a + b1*x + b2*x^2 How can I interpret b1...

    Started by russel2000‎, 04-25-2015 08:04 AM
    • Replies: 5
    • Views: 1,015
    04-25-2015, 04:01 PM Go to last post
  25. Estimation with negative coefficients

    Hi, I have probably an easy problem, however I'm not really sure how to do it: Basically, I would like to estimate a linear regression with OLS. So...

    Started by InGoogleITrust‎, 04-25-2015 04:24 AM
    • Replies: 4
    • Views: 776
    04-25-2015, 09:57 AM Go to last post
  26. Standard or Hierarchical Regression?

    I would like to predict creativity (DV) through involvement (IV), after controlling for team size and gender. Questions 1) Do I use hierarchical...

    Started by funnyman‎, 03-16-2015 11:40 AM
    2 Pages
    1 2
    • Replies: 23
    • Views: 3,526
    04-22-2015, 03:06 AM Go to last post
  27. Stepwise Regression with solution limited to max # independent vars - Best approach?

    I am using MiniTab for stepwise regression. I have 25 independent variables I want to run through the stepwise procedure. However, I want the...

    Started by statburner‎, 04-21-2015 06:01 PM
    • Replies: 0
    • Views: 672
    04-21-2015, 06:01 PM Go to last post
  28. Regression analysis for periodic data

    I am working on a hedging model for commodity.I have past 36 months data of commodity market price and future contracts price. e.g. on 1st...

    Started by TheMonkster‎, 04-21-2015 01:29 AM
    • Replies: 0
    • Views: 672
    04-21-2015, 01:29 AM Go to last post
  29. Help calculating standard error of intercept

    Hi all, I'm running an equally weighted moving average multiple regression with 10 explanatory variables, and I'm looking at the change in alpha...

    Started by Karl Gustaf Karsten‎, 04-18-2015 08:58 AM
    • Replies: 5
    • Views: 3,126
    04-19-2015, 05:06 PM Go to last post
  30. Lousy model or case of complete separation...?!

    Hi! I'm struggling to get my model to fit my data through logistic regression in SPSS. I've got 3 categorical predictors: Behandl (yes/no)...

    Started by Singalore‎, 04-18-2015 07:46 AM
    • Replies: 0
    • Views: 437
    04-18-2015, 07:46 AM Go to last post
  31. DEA Analysis

    Hi, I'm currently looking for some materials on DEA Analysis. Do you guys have any e-books or good webpages on this topic? I seek a material...

    Started by JennyX28X‎, 04-09-2015 09:42 AM
    • Replies: 5
    • Views: 1,217
    04-16-2015, 06:57 AM Go to last post
  32. MLM (binary) Odds Ratio Interpretation

    In the following paper on MLM with a binary outcome: http://analytics.ncsu.edu/sesug/2014/SD-13.pdf It provides the following OR...

    Started by hlsmith‎, 04-15-2015 12:01 PM
    • Replies: 2
    • Views: 997
    04-15-2015, 01:08 PM Go to last post
  33. Problem - stationarity and relevance

    Hi all, I am doing my Bachelor's thesis at the moment and I ran into a problem I was hoping you could help me out with. While running my data...

    Started by irmax3‎, 04-15-2015 05:12 AM
    relevance, stationarity
    • Replies: 0
    • Views: 592
    04-15-2015, 05:12 AM Go to last post
  34. Averaging x and y before fitting regression model

    Hi everyone:wave::wave::wave: I have faced problem in my research when i fit a regression model my question is can i make moving average for...

    Started by abod1409‎, 04-14-2015 02:34 PM
    • Replies: 0
    • Views: 834
    04-14-2015, 02:34 PM Go to last post
  35. order determination sample size for autoregression

    Hi I am new to autoregression. I want to determine the order of an autoregression given a sample of size S1. I plan to use ordinary least...

    Started by debnathm‎, 04-13-2015 12:44 PM
    autoregressive, order determination, sample size
    • Replies: 0
    • Views: 814
    04-13-2015, 12:44 PM Go to last post
  36. Residuals in bivariate TLS regression

    Hi all, I'd like to calculate the Y-residuals from a TLS regression line: Y~X. Please take a look at the attached picture. Are the residuals of...

    Started by thom‎, 04-13-2015 09:52 AM
    • Replies: 0
    • Views: 588
    04-13-2015, 09:52 AM Go to last post
  37. Durbin-Watson statistic below 2, fixed effect model

    Hello I am asking for your advice. I am working with unbalanced panel data set. Sample contains data about 11 largest Finnish insurance companies,...

    Started by Runner‎, 04-11-2015 02:50 AM
    • Replies: 0
    • Views: 1,165
    04-11-2015, 02:50 AM Go to last post
  38. Data Normalization

    I have a problem that is challenging to me about fitting coefficient parameter. Here is the problem data (simple example) ...

    Started by wutao9999‎, 04-10-2015 12:30 PM
    • Replies: 1
    • Views: 847
    04-10-2015, 01:43 PM Go to last post
  39. PROC Means for dummy variables in SAS

    I have created a dummy variable in SAS, that in any given year takes the value 1 if both countries are members of the EMU and 0 otherwise in that...

    Started by JoLinda91‎, 04-10-2015 05:11 AM
    dummy variable, proc means, sas
    • Replies: 2
    • Views: 892
    04-10-2015, 11:54 AM Go to last post
  40. Force a regression coefficient to be negative

    I have a regression problem using variable X to predict Y. That is, Y = c + A*X + error. For the regression problem, we need that A must be...

    Started by wutao9999‎, 04-09-2015 09:15 AM
    • Replies: 4
    • Views: 1,175
    04-09-2015, 08:10 PM Go to last post
  41. Dummy variable for EMU countries

    Hello everyone :-) I have a dataset for 22 countries with 12 variables, where this two are important for this assigment: country1 Three-letter...

    Started by JoLinda91‎, 04-09-2015 12:51 PM
    • Replies: 0
    • Views: 791
    04-09-2015, 12:51 PM Go to last post
  42. Semivariogram and kriging

    Hello All, I am having problem with semivariogram. Say, there is three points (1,4),(2,1),(3,3). The results at this points are 50, 40 ,25. I want...

    Started by niloy112‎, 04-08-2015 08:43 PM
    • Replies: 0
    • Views: 731
    04-08-2015, 08:43 PM Go to last post
  43. Help with a Poisson Regression Equation

    I have attached an image of an equation of Poisson Regression that i am working on for my data analysis project. I want to understand it a bit as i...

    Started by rushan‎, 04-08-2015 05:39 AM
    • Replies: 1
    • Views: 807
    04-08-2015, 07:00 AM Go to last post
  44. SSE and b1 are independent? How can I prove that?

    at simple linear regression, are b1 and SSE independent. but how can i prove that? :confused: my text book said 'SSE is independent of each of...

    Started by Silverstar‎, 04-08-2015 03:41 AM
    regression, regression analysis, sse
    • Replies: 0
    • Views: 803
    04-08-2015, 03:41 AM Go to last post
  45. Smile Cox/ Binomial Regression: How to reconcile Non-significant model with significant IVs

    Hello I'm been performing some survival and regression analyses corresponding to an event of interest being death or a certain surgical procedure,...

    Started by illmatic_statistic‎, 04-06-2015 06:15 PM
    binomial logistic regress, cox regression, interpreting regression, wald test
    • Replies: 2
    • Views: 1,136
    04-07-2015, 06:03 PM Go to last post
  46. Stepwise Regression Help

    Hi, Statistics is not my strong suit and I could really use some help. I'm wondering if it is possible to do a stepwise regression with 9 IVs on...

    Started by Perpetua‎, 04-07-2015 04:00 PM
    • Replies: 0
    • Views: 1,110
    04-07-2015, 04:00 PM Go to last post
  47. Regression Analysis and Residual analysis from Minitab output

    The questions are on Regression and Analysis and Residuals. I need some explaining oh how to find and answer these questions just from a minitab...

    Started by bobbycontinelli‎, 04-07-2015 10:57 AM
    • Replies: 0
    • Views: 943
    04-07-2015, 10:57 AM Go to last post
  48. Regression help

    I ran a regression of event sales (y) and advertising spending (x). I got the following results: Correlation: .055 R2: .003 N: 438 y = 1.28x +...

    Started by Robk1015‎, 04-07-2015 07:36 AM
    • Replies: 6
    • Views: 1,055
    04-07-2015, 10:16 AM Go to last post
  49. Regression analysis

    Hi all. Could I use linear regression with not normal distributed variable?

    Started by RealBG‎, 04-03-2015 11:30 PM
    • Replies: 6
    • Views: 1,334
    04-06-2015, 11:39 AM Go to last post
  50. Multiple variable regression(BUT only one coefficient to be estimated)

    Dear, For our master thesis we need to regress the equation Pt-P(t-1)= S/2*(Qt-Q(t-1))+Beta*S/2*(Qt-1)+et or http://prntscr.com/6q81o8 It...

    Started by Arno050‎, 04-06-2015 06:11 AM
    • Replies: 0
    • Views: 750
    04-06-2015, 06:11 AM Go to last post
  51. Validation for prognostic marker

    Dear All, I am completely lost in the area of statistics. I have a dataset of 265 cancer patients with a novel protein marker as well as the known...

    Started by ambinlab‎, 04-03-2015 01:37 AM
    • Replies: 3
    • Views: 891
    04-05-2015, 12:24 PM Go to last post
  52. Regression

    When performing regression analysis on excel with data that has been condensed, should you expand the data before creating the analysis table. For...

    Started by Thebluesclues‎, 04-05-2015 06:44 AM
    • Replies: 1
    • Views: 996
    04-05-2015, 06:53 AM Go to last post
  53. Need Help on this question about Ratio of two parameters

    I need help on this question: Suppose we have two independent samples from one population: Global Sample(Xg,Yg) and Local Sample(Xl,Yl) And we...

    Started by mahdi‎, 04-02-2015 10:14 AM
    calibration, regression analysis, regression help
    • Replies: 0
    • Views: 628
    04-02-2015, 10:14 AM Go to last post
  54. How to find Significant difference in R2

    Hi My study requires comparing the regression square got from accounting policy 1 and from accounting policy 2. Same set of samples are used in...

    Started by CAShobana‎, 04-02-2015 02:23 AM
    • Replies: 0
    • Views: 942
    04-02-2015, 02:23 AM Go to last post
  55. Fisher r to z transform / significance test for two different values of r^2

    Short version: I have two values of r^2 from Pearson's correlation, one from a control group (.713) and one for an experimental (.527), and I would...

    Started by biosciguy‎, 04-01-2015 01:11 AM
    correlation coefficient, fisher's z-transformed, r language, r-squared
    • Replies: 1
    • Views: 1,442
    04-01-2015, 08:10 AM Go to last post
  56. Does rate of change in proportion variable depend on ranked independent variable?

    I am doing an analysis on the prevalence of a drug resistance mutation in a particular country and how prevalence changed over time. Samples were...

    Started by bushmanm‎, 03-31-2015 07:38 PM
    • Replies: 0
    • Views: 536
    03-31-2015, 07:38 PM Go to last post
  57. Interaction terms with non-signficant main effects

    I am using a logit model to do the analysis on my dissertation data. 2 of the variables interact, so I have an interaction term. My question is 2...

    Started by smk2121‎, 03-31-2015 08:19 AM
    interactions, logit model, main effect
    • Replies: 2
    • Views: 730
    03-31-2015, 01:35 PM Go to last post
  58. 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 01:46 AM
    • Replies: 1
    • Views: 1,730
    03-31-2015, 08:12 AM Go to last post
  59. 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 01:10 PM
    • Replies: 0
    • Views: 613
    03-30-2015, 01:10 PM Go to last post
  60. 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 06:25 PM
    continous variable, logistic regression, predictor, sensitivity, specificity
    • Replies: 1
    • Views: 1,135
    03-30-2015, 03:38 AM Go to last post

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