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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. 1 out of 5 predictors is non-linear - can I proceed with OLS estimation?

    Hello dear forum members! My univariate multiple regression model includes 5 predictors + 2 interaction terms. However, examination of the fitted...

    Started by kiton‎, 01-22-2015 12:36 PM
    3 Pages
    1 2 3
    • Replies: 30
    • Views: 5,869
    01-24-2015, 01:58 AM Go to last post
  2. Multiple Regression Analysis of a time series

    Hello everyone! I'm trying to use multiple regression analysis of a time series, but I've run into a problem interpreting the data. First, I've...

    Started by minchazo‎, 02-04-2008 05:48 PM
    • Replies: 0
    • Views: 5,866
    02-04-2008, 05:48 PM Go to last post
  3. Regression using gram-schmidt orthogonalization

    Hello dear members, Hoping again to solicit some help from the knowledgeable members here, I thought I'd come to you with this question. I'm...

    Started by Link‎, 12-05-2010 12:33 PM
    • Replies: 7
    • Views: 5,866
    12-07-2010, 11:31 PM Go to last post
  4. Collinearity help

    I saw a suggestion on a web page for dealing with collinearity I had not seen before. http://www2.chass.ncsu.edu/garson/pa765/tacq.htm "Treat...

    Started by mishery‎, 10-25-2005 11:56 AM
    • Replies: 5
    • Views: 5,831
    06-28-2011, 07:51 AM Go to last post
  5. implications of residual heteroskedasticity

    Hello, I'm running a multiple regression with 4 predictors, and when I examined the Standardized residuals. a Graph is below. I'm just...

    Started by Lambic_Treasure‎, 02-14-2011 02:34 PM
    • Replies: 9
    • Views: 5,827
    02-15-2011, 05:40 PM Go to last post
  6. cut-off point for binary logistic regression without ROC curve

    Hi! I just want to know how to find a relatively good cut-off point for binary logistic regression model. I haven't learnt anything on ROC curve. Is...

    Started by xiaochen‎, 05-06-2012 11:29 AM
    cut-point, logistic regression
    • Replies: 0
    • Views: 5,818
    05-06-2012, 11:29 AM Go to last post
  7. Stepwise Regression

    Let Y = Company Sales X1 = Overall Industry Sales X2 = Advertising Expenditure X3 = Special Promotion by Competitor (0 = Yes, 1 = No) Using...

    Started by doctorwho‎, 04-24-2010 08:47 PM
    • Replies: 2
    • Views: 5,812
    04-26-2010, 02:30 PM Go to last post
  8. Relative weights (people's thoughts)

    I recently came across a paper and an R function to calculate relative weights. When I do Hierarchical block-wise multiple regression I'm always...

    Started by trinker‎, 09-17-2012 07:43 PM
    • Replies: 1
    • Views: 5,789
    09-17-2012, 09:53 PM Go to last post
  9. General Linear Model issues.

    Again, I hope this is in the correct sub-forum. Having had some very useful advice for my first issue, I thought I might post my second problem, this...

    Started by _Alex_‎, 11-30-2011 05:29 PM
    • Replies: 2
    • Views: 5,786
    12-01-2011, 07:32 PM Go to last post
  10. SST = SSE + SSR, proof

    Hi, I've been trying to figure out for a long time how to derive the starting equation of the proof. I have no idea how to come up with it. It's...

    Started by stephen123456‎, 08-27-2016 04:25 PM
    • Replies: 2
    • Views: 5,779
    08-29-2016, 10:39 AM Go to last post
  11. Interpreting the conclusion of t-test and explaining the p-value

    Hi, I'm working on an assignment which asks me to interpret the conclusion of my t-test regarding the average reading score and the student teacher...

    Started by shle‎, 03-21-2012 02:13 AM
    • Replies: 0
    • Views: 5,767
    03-21-2012, 02:13 AM Go to last post
  12. Goodness of fit for Mixed effects Logistic Regression

    Dear all, I am trying to assess the goodness of fit of random effects Logistic regression. a) I would have used a Hosmer-Lemeshow test, but how...

    Started by ledzep‎, 12-02-2013 06:15 PM
    • Replies: 4
    • Views: 5,764
    12-02-2013, 09:52 PM Go to last post
  13. 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: 5,763
    04-22-2015, 03:06 AM Go to last post
  14. Mixed effects logistic Regression

    I have what I believe is a mixed effects logistic regression. My outcome is injury (y/n) and I have subject level (age, gender, smoking) and Class...

    Started by smh5154‎, 08-27-2013 01:12 PM
    logistic regression, mixed effects, multi-level, predictors
    • Replies: 3
    • Views: 5,749
    08-28-2013, 07:06 AM Go to last post
  15. Interaction effect in a logistic regression between cont and cat variables.

    Hi guys, I am conducting a logistic regression on whether a participants test positive or not to HIV (1=positive; 0 Negative) in a sample of...

    Started by Marvin85‎, 04-17-2013 09:48 AM
    2 Pages
    1 2
    interaction effect, logistic, suppressor effect
    • Replies: 19
    • Views: 5,746
    04-30-2013, 10:28 AM Go to last post
  16. Logit coefficients interpretation...

    Logistic regression Number of obs = 1315 LR chi2(32) = ...

    Started by jesse2‎, 12-21-2011 11:49 PM
    • Replies: 2
    • Views: 5,745
    12-22-2011, 05:37 AM Go to last post
  17. Logistic regression with dependent variables

    Dear All I'm trying to perform logistic regression to determine risk factors for retinopathy of prematurity (ROP). The outcome is binary 1=...

    Started by SiBorg‎, 10-02-2010 04:47 AM
    • Replies: 4
    • Views: 5,736
    10-06-2010, 06:35 PM Go to last post
  18. Statistics Help (Invoice Question)

    Please help! The manager of the purchasing department of a large banking organization would like to develop a model to predict the amount of time...

    Started by student00‎, 08-12-2008 02:55 PM
    • Replies: 4
    • Views: 5,728
    08-13-2008, 08:05 PM Go to last post
  19. What's a logistic regression?

    Hello, in college we learned multiple regression techniques (different models: linear, log-lin, lin-log, exponential, ...) - including all the...

    Started by Analytics‎, 12-24-2007 05:34 PM
    • Replies: 4
    • Views: 5,696
    12-30-2007, 05:45 PM Go to last post
  20. 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: 5,681
    04-19-2015, 05:06 PM Go to last post
  21. Why does the coefficient change sign when another variable is added to the OLS model?

    Dear all, I am trying to run an OLS regression in Stata 13, with log of per capita calorie as my dependent variable and age and years of education...

    Started by monzur‎, 12-19-2014 03:53 PM
    • Replies: 7
    • Views: 5,678
    12-19-2014, 04:27 PM Go to last post
  22. collinearity and Heteroscedasticity in bivariate probit model

    Hi, all I run a bivariate probit regression, and I am not specialized in statistics and I dont know how to check collinearity and...

    Started by momo‎, 10-14-2010 03:32 PM
    • Replies: 0
    • Views: 5,670
    10-14-2010, 03:32 PM Go to last post
  23. partial R2 in multivariate linear regression

    Hi there! Im performing multivariable linear regression models with SPSS. I would like to know how can I calculate partial R2 for the independant...

    Started by juanpe000‎, 01-18-2011 07:12 AM
    • Replies: 0
    • Views: 5,666
    01-18-2011, 07:12 AM Go to last post
  24. coding for dummy variable

    Hello all, I am wondering why dummy variables should always be coded either 0 or 1. For example, does it make any mathematical difference in...

    Started by luic‎, 03-17-2011 02:05 AM
    • Replies: 2
    • Views: 5,649
    03-17-2011, 07:26 AM Go to last post
  25. Confidence Interval for Prediction in Weighted Regression

    Hi everyone, I'm currently writing my final year project in analytical chemistry, and have got to the stage of calculating confidence intervals...

    Started by skyllberg‎, 03-22-2009 12:39 PM
    • Replies: 0
    • Views: 5,636
    03-22-2009, 12:39 PM Go to last post
  26. 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: 5,631
    12-08-2008, 03:33 PM Go to last post
  27. All my coefficients are statistically significant

    Hi All, I am running a fixed effects model in stata, but all my independent variables are statistically significant. I am wondering if I am doing...

    Started by royalstatus‎, 09-23-2013 05:24 PM
    2 Pages
    1 2
    • Replies: 18
    • Views: 5,626
    10-03-2013, 06:21 PM Go to last post
  28. Hypothesis

    If you got this model: mode 1) y=a +b1x1 + b2x2 + u and this: mode 2) y=a + b1(x1-x2) + u What do you call the restriction there has...

    Started by Mikkelsoeren‎, 08-14-2011 05:31 PM
    2 Pages
    1 2
    • Replies: 19
    • Views: 5,620
    08-15-2011, 09:21 AM Go to last post
  29. Cool Multiple Regression with Multiple Groups

    Hello, I am looking at predictor variables (scores on partner perception measures) on a criterion variable (relationship satisfaction), in order to...

    Started by Shadow3758‎, 11-26-2008 05:35 PM
    • Replies: 9
    • Views: 5,594
    11-26-2008, 06:58 PM Go to last post
  30. Regression analysis for a cross sectional study

    Good morning all. I am supposed to perform a regression analysis for a crossectional survey, using STATA. The thing is i dont know where to...

    Started by nostatisticsgirl‎, 03-24-2011 12:14 AM
    • Replies: 0
    • Views: 5,590
    03-24-2011, 12:14 AM Go to last post
  31. Degrees of freedom for a moving average?

    Can someone please help me to determine the correct number of degrees of freedom used when calculating a moving average? For example, with annual...

    Started by Joz‎, 09-11-2012 12:36 AM
    degrees of freedom, moving average
    • Replies: 0
    • Views: 5,590
    09-11-2012, 12:36 AM Go to last post
  32. R-square and interactions (multiple regression)

    Hi, I am doing a GLM regression analysis and have a question about interactions and model fit. My dependent variable is 'salary', and I have...

    Started by williaml‎, 03-16-2010 08:19 AM
    • Replies: 1
    • Views: 5,583
    03-16-2010, 08:50 PM Go to last post
  33. bootstrap correlation

    Hi, I am wondering if is it correct to use bootstrap methods to get an estimate of correlation coefficient (Pearson) when data violate some of the...

    Started by gianmarco‎, 10-02-2010 01:40 AM
    • Replies: 2
    • Views: 5,582
    10-08-2010, 02:09 AM Go to last post
  34. Logistic regression diagnostic questions

    I have a set of 42 variables which I am trying to determine the relative importance of. Well I already did but now I am trying to determine if...

    Started by noetsi‎, 03-18-2013 09:41 AM
    2 Pages
    1 2
    • Replies: 19
    • Views: 5,566
    03-20-2013, 10:40 AM Go to last post
  35. Cool Regression with non- parametric data....

    Hello! I have conducted the normality test Anderson-Darling on my data, and with a p value of <0,010, I guess that the data are not normal...

    Started by Rebecka‎, 03-24-2012 08:35 AM
    • Replies: 8
    • Views: 5,556
    03-26-2012, 03:42 AM Go to last post
  36. Multiple Linear Regression and likelihood Ratio Test

    Hi All, I have completed multiple regressions with one model including an interaction term, and the other not including the interaction term. ...

    Started by chiccaboom‎, 11-05-2013 09:44 PM
    • Replies: 4
    • Views: 5,553
    11-06-2013, 09:22 PM Go to last post
  37. Combining regression with time series

    Using an existing time series of supermarket sales data I need to make a forecast. Basically a simple exponential smoothing model explains future...

    Started by kenasto‎, 01-20-2011 09:49 PM
    • Replies: 2
    • Views: 5,549
    04-19-2012, 05:59 AM Go to last post
  38. Box-Tidwell procedure

    Hello everyone, Is there a possibility to perform Box-Tidwell procedure in SPSS, or any other convenient software? Thanks.

    Started by bekkiee‎, 06-28-2012 04:38 PM
    • Replies: 0
    • Views: 5,549
    06-28-2012, 04:38 PM Go to last post
  39. standardizing residuals

    Hi All, I'd like to standardize residuals. Can anybody tell me the formula to standardize to mean 0 and standard deviation 1? I also do not...

    Started by cincan‎, 09-09-2010 04:05 PM
    • Replies: 3
    • Views: 5,536
    09-10-2010, 04:35 AM Go to last post
  40. Regression SS in multiple linear regression

    In MULTIPLE linear regression, is it still true that the regression sum of squares is equal to ∑ (Y_i hat -Y bar)^2 ??? My textbook defines...

    Started by kingwinner‎, 06-20-2009 07:04 AM
    • Replies: 3
    • Views: 5,533
    06-20-2009, 04:55 PM Go to last post
  41. Constructing Prediction Intervals for Forecasted Values in a Time Series

    I have a time series with 231 data points and the following descriptive statistics: Mean 75,231.66 Standard Error 969.98 Median 70,728.00 ...

    Started by David Lahar‎, 09-16-2013 03:16 PM
    • Replies: 3
    • Views: 5,524
    09-18-2013, 09:14 AM Go to last post
  42. How to convert logistic Coefficient into percentage %

    Hi Please I need help with conveting logistic Coefficient into percentage % to help me with analysing the regression. Regards Mod Note:...

    Started by suha‎, 01-09-2011 02:36 PM
    • Replies: 0
    • Views: 5,505
    01-09-2011, 02:36 PM Go to last post
  43. Logistic regression or DFA?

    Hi! I am trying to get my masters thesis done. I am taking a statistics course right now, but I need to get started on things sooner rather than...

    Started by Merlion‎, 01-14-2009 10:52 PM
    • Replies: 3
    • Views: 5,501
    01-15-2009, 08:43 AM Go to last post
  44. Help with non-linear regression, SPSS

    Hey all New to the forums and was hoping for some help with writing out part of a non-linear regression model from somebody brighter than me. So...

    Started by fortenberry‎, 10-19-2010 08:13 AM
    • Replies: 2
    • Views: 5,500
    10-19-2010, 10:02 AM Go to last post
  45. How to avoid collinearity in regression

    Hi there, I am new in statistics so my question will be a bit naive. When I perform regression, some variables are excluded. It is, maybe, because...

    Started by AsoInfo‎, 09-05-2012 01:22 AM
    • Replies: 9
    • Views: 5,498
    09-09-2012, 06:57 AM Go to last post
  46. Poisson regression and effects of predictors

    Dear all, I just registered this forum too, since I am in doubt what to do! In a study, I want to determine the effects of grazing by animals...

    Started by jaofik‎, 08-23-2011 02:58 PM
    • Replies: 4
    • Views: 5,493
    08-24-2011, 06:50 AM Go to last post
  47. Cook distance and leverage

    I have a data point for which leverage value is > 3(p+1)/n but the value of cook's distance is < 1. Can i say that, this is an outlier but it is...

    Started by sach_83‎, 01-02-2011 04:37 AM
    • Replies: 1
    • Views: 5,478
    01-02-2011, 07:33 PM Go to last post
  48. 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: 1
    • Views: 5,475
    12-18-2015, 07:26 PM Go to last post
  49. R2 vs lack of fit

    Hello: I am working with a multiple regression model where I see a 91% R2 but significant lack of fit with pure error. I also have a slighly...

    Started by need‎, 01-25-2012 01:49 PM
    • Replies: 4
    • Views: 5,466
    01-25-2012, 02:57 PM Go to last post
  50. Count data independent variable

    I am going to run a regression using count data as independent variables, with the dependent variables being the amount of investment in . Given...

    Started by maltesedog‎, 05-13-2013 10:05 AM
    • Replies: 3
    • Views: 5,446
    05-13-2013, 10:32 AM Go to last post
  51. Interpreting unstandardized coefficients and their strength

    Hi, I conducted a multiple regression analysis with 2 independent variables. Now I'm trying to analyze the strength of these variables between men...

    Started by unstandardizedB‎, 01-26-2011 03:32 PM
    regression, unstandardized b
    • Replies: 0
    • Views: 5,445
    01-26-2011, 03:32 PM Go to last post
  52. Combining Regression and PCA scores

    I work in market research, and we're often asked to run regression to determine the impact of various components (like product attributes) on overall...

    Started by Injektilo‎, 12-18-2010 07:07 PM
    • Replies: 1
    • Views: 5,436
    12-19-2010, 06:40 AM Go to last post
  53. how to enter certain data, and should i use t test?

    Hi all,:wave: I'm new here and need life saving help with my MEd dissertation! I'm studying moral development (SRMS SCORE) and play opportunities...

    Started by ladyt‎, 08-16-2008 08:10 AM
    • Replies: 2
    • Views: 5,427
    08-18-2008, 04:38 AM Go to last post
  54. How to Organize Years in SPSS for Linear Regression

    Hello, IV: Time DV: Number of Alcohol References in Music Hypothesis: Alcohol references in country music will increase significantly over the...

    Started by sprices‎, 09-10-2013 04:16 PM
    • Replies: 0
    • Views: 5,419
    09-10-2013, 04:16 PM Go to last post
  55. Smile Stepwise and all-possible-regressions

    Hi all, Before I start I just wanted to cordially thank you all for this great community...I really admire the work you have done...and the...

    Started by triunk‎, 01-24-2013 11:11 AM
    regression analysis
    • Replies: 14
    • Views: 5,415
    01-29-2013, 12:19 AM Go to last post
  56. Expectation/ Variance/ ACF and PACF in ARMA(2,1)

    Hello guys, I hope I'm not posting in the wrong subforum. I am looking for a solution to calculate E, Var, and ACF and PACF coefficents in an...

    Started by yoz2k3‎, 06-16-2011 05:04 AM
    • Replies: 1
    • Views: 5,413
    06-17-2011, 08:09 PM Go to last post
  57. Regression analysis of more than two independent and dependent variables

    Hello, I want to find the relationship between independent and dependent variables using regression analysis. There are 5 IV and 4 DV. Please...

    Started by ashima‎, 04-11-2012 07:20 AM
    • Replies: 8
    • Views: 5,399
    05-14-2012, 09:50 AM Go to last post
  58. Question Reporting hierarchical regression

    I have a 2-step hierarchical regression. Step 1 Variable A = significant p<.001 Step 2 Variable A = now non significant Variable B =...

    Started by sneaks‎, 01-12-2011 11:57 AM
    • Replies: 2
    • Views: 5,390
    01-15-2011, 07:01 AM Go to last post
  59. Bayesian approach for logistic regression models? (the case of low-count cells)

    so... now that i'm a PhD student my advisor wants me to help out people with their projects. as fate may have it, the same problem has arisen both in...

    Started by spunky‎, 12-09-2013 04:26 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 5,390
    12-10-2013, 01:54 PM Go to last post
  60. Unequal sample size among sub-groups: Effects on significance levels?

    Hello, I just came across a finding which I find somewhat strange: I conducted a quite simple multiple regression analysis in a dataset that...

    Started by szidel‎, 07-24-2013 01:04 AM
    regression; significance;
    • Replies: 6
    • Views: 5,388
    07-25-2013, 02:37 AM Go to last post

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