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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Comparing model fits of non nested models

    Dear all, I am a student in Sociology at the University of Amsterdam and currently working on a paper on which I got stuck. Let me briefly...

    Started by thaiz‎, 09-14-2010 02:56 AM
    • Replies: 0
    • Views: 3,930
    09-14-2010, 02:56 AM Go to last post
  2. variance-stabilizing transformation for simple linear regression

    studying for a test.. need some help. Consider a simple linear regression analysis with β0 and β1 both positive. Suppose that the mean of the...

    Started by hanelliot‎, 06-21-2009 12:07 PM
    • Replies: 1
    • Views: 3,927
    06-21-2009, 06:43 PM Go to last post
  3. Logistic transformation - please help with the use of scientific calculator

    Hi there, I believe I have a trivial question. I am studying logistic regression and trying to understand how the values are transformed - e.g ...

    Started by Sylviastat‎, 03-29-2011 01:57 PM
    • Replies: 4
    • Views: 3,925
    03-29-2011, 05:34 PM Go to last post
  4. Moderated regression: correlation between moderator and predictor

    Hi All, my data suggest a significant positive moderation that can be grounded on (somewhat ;)) strong theory. Everything looks fine...

    Started by Wolf_2011‎, 07-14-2011 04:15 AM
    • Replies: 0
    • Views: 3,924
    07-14-2011, 04:15 AM Go to last post
  5. multiple regression and mediators

    Hi I have 10 independent variables and 1 dependent variable. Of the 10 i have selected 4 variables as my predictors for my multiple regression. I...

    Started by eleanor_rigby‎, 05-01-2012 06:52 AM
    • Replies: 4
    • Views: 3,922
    05-02-2012, 05:57 AM Go to last post
  6. Regression suitability question

    Hello, Could anyone help me out with some pointers please? I'm looking to use some statistics to help predict student % school absence rates...

    Started by orangecrush‎, 11-13-2011 04:42 AM
    • Replies: 4
    • Views: 3,912
    11-13-2011, 06:00 PM Go to last post
  7. Is it normal to have negative constants?

    I was wondering whether we must include an intercept term in our equation? Also I have negative (some) significant constants. I know it means that...

    Started by dou‎, 05-23-2011 04:26 AM
    • Replies: 2
    • Views: 3,911
    05-25-2011, 12:20 AM Go to last post
  8. Logistic Regression and Multiple Regression

    Hi, Please could you help me (or direct me to someone who can help me) with the following: I have a spreadsheet with a number of...

    Started by Andrewdevilliers‎, 09-06-2011 09:36 AM
    categories, logistic regression, logit, multiple regression, multiple variables
    • Replies: 13
    • Views: 3,909
    09-07-2011, 10:17 AM Go to last post
  9. Significance Issue in Regression

    Hi everyone! I have a statistical question that I hope someone can answer. I am doing a research about relationship between satisfaction and...

    Started by Mikica‎, 08-26-2007 07:14 AM
    • Replies: 9
    • Views: 3,907
    08-29-2007, 03:17 PM Go to last post
  10. Ordered Logit - Probabilities and quadratic term

    Hi everyone, I'm running into a problem interpreting a quadratic (curvilinear) relationship using an ordered logit model. the d.v. is self...

    Started by seandb‎, 04-04-2012 04:03 PM
    • Replies: 0
    • Views: 3,904
    04-04-2012, 04:03 PM Go to last post
  11. log-transformation and interaction effects

    If I log-transform either one of my predictor variables or my outcome variable, can that change the significance of any of my interaction terms? ...

    Started by bitethemuffin‎, 11-29-2011 07:51 PM
    • Replies: 0
    • Views: 3,901
    11-29-2011, 07:51 PM Go to last post
  12. AIC number of parameter

    Dear all, I am new in this forum. I m facing a problem with my AIC. I m using model selection framework (Akaike’s weights) with various type...

    Started by Rigal@mnhn.fr‎, 01-23-2011 07:31 PM
    aic, ecology, information criterion, model selection
    • Replies: 0
    • Views: 3,896
    01-23-2011, 07:31 PM Go to last post
  13. Repeated measures in EEG.

    Hello, I am currently working on the analysis of an EEG data set. We measured the EEG signal for 170 verbs and 24 subjects in a picture naming...

    Started by SomeLinguist‎, 06-12-2008 07:07 AM
    • Replies: 0
    • Views: 3,895
    06-12-2008, 07:07 AM Go to last post
  14. Poisson regression with interactions

    I am investigating the risk of getting different forms of leukemia if you live near a hazardous waste site in New York state. I am working with PROC...

    Started by bobban‎, 05-05-2009 04:53 PM
    • Replies: 0
    • Views: 3,895
    05-05-2009, 04:53 PM Go to last post
  15. I cannot calculate covariance ratio, please help me

    My results of covariance ratio (influence statistic) is always different as for example the SPSS output. I donít know where is my failure. Could...

    Started by Palepoli‎, 10-14-2010 03:09 PM
    • Replies: 0
    • Views: 3,895
    10-14-2010, 03:09 PM Go to last post
  16. testing interaction between two independent variables

    To test for interaction between two independent variables in a linear multiple regression model (e.g. 'A' and 'B' as independent variables; 'C' as...

    Started by lingdeer‎, 11-29-2012 04:40 PM
    • Replies: 0
    • Views: 3,895
    11-29-2012, 04:40 PM Go to last post
  17. multivarient nonlinear regression in SPSS

    is there are way of doing this in SPSS? I have looked around and come to a blank... I need to derive an equation to describe the (most likely...

    Started by E_J‎, 09-21-2010 08:58 AM
    • Replies: 0
    • Views: 3,894
    09-21-2010, 08:58 AM Go to last post
  18. Analyses of count data for seedling survival: poisson or logistic regression?

    Am I dealing with survival data (binary) or count data, and which is the best statistical analysis? I have counted seedlings surviving in each of...

    Started by ndafuda‎, 06-15-2012 04:38 AM
    • Replies: 8
    • Views: 3,893
    08-01-2012, 04:42 AM Go to last post
  19. Fill in multiple missing values given correlation matrix

    I have a correlation matrix: mat <- round(cor(mtcars), 2) mpg cyl disp hp drat wt qsec vs am gear carb mpg 1.00...

    Started by trinker‎, 04-26-2016 09:51 AM
    2 Pages
    1 2
    • Replies: 16
    • Views: 3,892
    05-01-2016, 09:39 PM Go to last post
  20. LOGIT im Panel - Pooled, population-averaged, fixed, random?

    Hey community, I run a logistic regression in panel with Stata. I'm not sure if I should use a fixed-effect, random-effect, population-averaged or...

    Started by Andy‎, 08-27-2012 11:30 AM
    • Replies: 2
    • Views: 3,886
    08-28-2012, 09:38 AM Go to last post
  21. Plotting output from logistic regression???

    I ran a quasi-likelihood logistic regression using S-plus and have a question about how to plot and interpret the results. How can I construct...

    Started by Boxor‎, 09-21-2010 05:35 PM
    • Replies: 0
    • Views: 3,884
    09-21-2010, 05:35 PM Go to last post
  22. Durbin watson

    :confused: :confused: i'm in a big big problem? i'm a demonestrator in medical statistics department this week i have to prepare a seminar about...

    Started by Ghada‎, 08-27-2006 03:34 AM
    • Replies: 0
    • Views: 3,881
    08-27-2006, 03:34 AM Go to last post
  23. CLS vs OLS

    What is the difference between classical least squares regression (CLSR) and linear least squares regression (also known as ordinary least squares...

    Started by hazelnut‎, 01-13-2011 08:16 PM
    • Replies: 0
    • Views: 3,879
    01-13-2011, 08:16 PM Go to last post
  24. Coefficient of correlation and forcing to pass origin

    Hello! I donít understand much about statistics, so forgive me if this is a very basic question :o Iím working with linear regression, forcing...

    Started by MopsaAspom‎, 05-18-2012 10:00 AM
    • Replies: 4
    • Views: 3,878
    05-18-2012, 11:26 AM Go to last post
  25. Exclamation Need Help - Dummy variable for GDP per capita

    Please answer the following questions...

    Started by Vedruss‎, 01-29-2011 08:45 AM
    • Replies: 1
    • Views: 3,877
    01-29-2011, 09:39 AM Go to last post
  26. Categorical variables - Logistic regression

    Hello, I am trying to run a logistic regression model. I have 4 numeric and 1 categorical variable which are significant. The categorical...

    Started by nikhil_s‎, 03-07-2012 10:38 AM
    binning, categorical data analysis, categorical vairable, logistic regression
    • Replies: 5
    • Views: 3,875
    03-07-2012, 02:06 PM Go to last post
  27. Logistic regression null values

    I think I know the answer, but just confirming. I'm doing a multiple logistic regression with 15 predictor variables. Must ALL values of the...

    Started by jawon‎, 10-21-2009 05:30 PM
    • Replies: 0
    • Views: 3,873
    10-21-2009, 05:30 PM Go to last post
  28. Use of partial regression plots to check for non-linearity

    These are commonly recommended to detect non-linearity in interval level predictors. I ran these in SAS and I have a difficult time interpreting the...

    Started by noetsi‎, 03-11-2016 01:53 PM
    2 Pages
    1 2
    • Replies: 19
    • Views: 3,869
    03-14-2016, 03:28 PM Go to last post
  29. Need for Transformation?

    I'm running an OLS regression. My predictors are continuous, but they are proportions that are bounded by 0 and 1. Because there are many 0s in my...

    Started by intlgirl‎, 10-23-2010 08:36 PM
    • Replies: 2
    • Views: 3,853
    10-23-2010, 10:40 PM Go to last post
  30. Please help.... explaining the table

    Hi, all I am working on a bivariate probit model and I nearly got the results, but I have no idea to check about collin.... and hetro... problems....

    Started by momo‎, 10-15-2010 10:42 AM
    • Replies: 2
    • Views: 3,852
    10-18-2010, 04:20 AM Go to last post
  31. Red face Stupid Question: Help This Noob with Parking

    :o Hi, I have been knocking my head against the wall of statistics (so to speak) for uncounted hours and just can't figure this out. I cannot...

    Started by meinhaj‎, 10-15-2010 11:38 AM
    • Replies: 1
    • Views: 3,852
    10-15-2010, 11:53 AM Go to last post
  32. Eviews 9 Tutorial Two Stage Least Squares

    Two-stage least squares (TSLS) is a special case of instrumental variables regression. As the name Suggests, there are two distinct stages in the...

    Started by OlhDt_semarang‎, 12-09-2015 08:46 PM
    guide eview 9, tutorial eviews 9
    • Replies: 0
    • Views: 3,846
    12-09-2015, 08:46 PM Go to last post
  33. Correlation coefficients as a variable in a multiple regression?

    Hi I would like to do a multiple regression using correlation coefficients as my dependent variable - is this possible? Specifically the...

    Started by Lizzie_Liz‎, 01-26-2010 11:33 AM
    • Replies: 1
    • Views: 3,842
    02-02-2010, 10:35 PM Go to last post
  34. Binary predictors, continuous independent V!

    hi everyone I need help with doing a regression model. How can I perform a regression analysis when the only independent variable is a continuous...

    Started by helloamerica‎, 03-03-2011 12:37 PM
    • Replies: 3
    • Views: 3,838
    03-03-2011, 05:52 PM Go to last post
  35. Difference in ROC curve - statistical test?

    Is there a test to determine if C (the area under a ROC curve) is significantly different than another C? Or does this question even make theoretical...

    Started by noetsi‎, 04-18-2013 03:12 PM
    • Replies: 3
    • Views: 3,838
    04-24-2013, 06:10 PM Go to last post
  36. Addendum: Probit Model, Liklihood Ratio Significant, Very Low Pseudo R-Square

    Multicollinearity does not appear to be a problem. None of the predictor variables has a VIF over 1.5.

    Started by DavidBill‎, 02-25-2011 08:47 AM
    • Replies: 2
    • Views: 3,832
    02-25-2011, 11:23 AM Go to last post
  37. Multiple Regression Model to Predict House Price

    Hi there, I have a statistics assignment and the first question is causing me some trouble. The question is to predict the price of a 2...

    Started by purplekay‎, 04-09-2013 10:58 AM
    • Replies: 0
    • Views: 3,821
    04-09-2013, 10:58 AM Go to last post
  38. What is the difference between an interaction effect and a moderator in regression?

    I hear these two concepts a lot in the literature. I have no idea what the difference is between a moderator and an interaction term. While I am...

    Started by noetsi‎, 01-28-2016 01:56 PM
    2 Pages
    1 2
    • Replies: 24
    • Views: 3,817
    02-24-2016, 03:02 PM Go to last post
  39. Linear model accounting for fixed effects vs. ordered probit

    I originally ran an ordered probit model on an ordinal dependent variable (values 1-12), however in order to account for fixed effects in my analysis...

    Started by ARW90‎, 02-04-2012 10:38 AM
    econometrics, fixed effects, ordered, probit
    • Replies: 3
    • Views: 3,813
    02-05-2012, 01:44 PM Go to last post
  40. Multiple regression least square estimation

    Can someone show me the equations and the derivation of the least square estimation of multiple linear regression? It would be even greater if...

    Started by byip‎, 05-20-2006 11:44 AM
    • Replies: 0
    • Views: 3,811
    05-20-2006, 11:44 AM Go to last post
  41. year fixed effects in time series regression

    I'm trying to estimate what effect the tariff rate in a specific country has on evasion of tariffs (or rather the underreporting of the value of...

    Started by oscarscheja‎, 08-26-2011 03:23 AM
    dummy variables, fixed effects, time series
    • Replies: 0
    • Views: 3,810
    08-26-2011, 03:23 AM Go to last post
  42. Expressing the sum of squared residuals as a matrix

    R, the n by 1 matrix of residuals, is given by y_i, an n by 1 matrix, minus X, an n by 2 matrix consisting of explanatory variables x_1 and x_2(where...

    Started by lm8ub‎, 06-06-2012 08:03 PM
    • Replies: 2
    • Views: 3,810
    06-09-2012, 09:24 PM Go to last post
  43. Logistic regression. How to combine classes in a mullticategorical variable?

    Hi, Iím preparing some data with a view to carry out a multivariable logistic regression. The dependent variable is LANDSLIDES, i.e....

    Started by mattdoughty‎, 02-21-2014 08:58 AM
    • Replies: 5
    • Views: 3,808
    02-21-2014, 11:45 AM Go to last post
  44. moderation in SPSS vs. PROCESS

    Hi. I did mediation and moderation analysis of one model in 2 programs: SPSS and PROCESS (macro). Mediation was the same, but moderation was...

    Started by Ginny Joyce‎, 10-15-2016 08:14 AM
    moderation, process, spss
    • Replies: 2
    • Views: 3,808
    12-19-2016, 08:35 AM Go to last post
  45. Stationarity in regression

    This is much a time series question as a regression one, but I work a lot with regression using time series data these days. I am running regression...

    Started by noetsi‎, 10-10-2013 09:59 AM
    • Replies: 4
    • Views: 3,803
    10-10-2013, 12:09 PM Go to last post
  46. Proc model

    I am now learning sas from the scratch. well, with Proc model procedure I want to get residuals, predicted values and possibly studentized...

    Started by mugashawil‎, 03-11-2011 12:09 PM
    • Replies: 0
    • Views: 3,801
    03-11-2011, 12:09 PM Go to last post
  47. Finding predicted values with logged (ln) dependent variable.

    Hello all, I'm currently working on my first quantitative project. I am doing an OLS regression in SPSS. I had to take the natural log of my DV in...

    Started by burdfishdemon‎, 07-27-2016 03:21 AM
    log transformation, ols, predicted values, spss, statistics
    • Replies: 4
    • Views: 3,799
    01-23-2017, 11:16 AM Go to last post
  48. very quick question about the 'intercept'

    If I am asked to state the intercept which one do I quote? Estimate, Std error, t value or Pr(>|t|) ? (If it makes any difference I am doing a...

    Started by misc763‎, 12-03-2009 03:47 PM
    • Replies: 4
    • Views: 3,795
    12-03-2009, 04:47 PM Go to last post
  49. have a .por file, no spss, need to run analysis by tomorrow

    Hi all.. I thought I could open the .por file I have on my home computer but it turns out the version I have doesn't open a file like this with more...

    Started by Empathy‎, 11-23-2009 09:13 PM
    • Replies: 0
    • Views: 3,794
    11-23-2009, 09:13 PM Go to last post
  50. Red face Polynomial regression help

    Hello, I am working in retailing here in Europe, and we are trying to support evidence that sales are positively correlated with space allocated,...

    Started by GraceJones‎, 11-29-2010 12:16 PM
    • Replies: 1
    • Views: 3,793
    12-05-2010, 04:02 PM Go to last post
  51. Unordered categorical variables and linear regression

    Hi everyone, I am new to this forum and still sort of a novice with regards to statistics. In my M.A. thesis I use one binary dependent...

    Started by Rasgal‎, 07-19-2013 10:19 AM
    • Replies: 5
    • Views: 3,793
    07-26-2013, 01:04 PM Go to last post
  52. assumption of linearity in the logit and transformation of continuous IV

    Hello, I am doing logistic regression in spss for my phd research. Testing the assumption of the linearity in the logit I included in the analysis...

    Started by Catherina‎, 05-11-2011 04:28 AM
    • Replies: 0
    • Views: 3,781
    05-11-2011, 04:28 AM Go to last post
  53. Advice for random effects with interaction term?

    I have a continuous dependent variable A and a continuous independent variable B. I measured these variables in 12 locations that can be separated...

    Started by sovay‎, 12-05-2011 12:26 AM
    • Replies: 1
    • Views: 3,780
    12-05-2011, 03:26 PM Go to last post
  54. Nonlinear Regression for the P/PE of the S&P 500??

    Hello All, Iím hoping that someone can help me figure out what regression model I should be using. I donít think that a linear regression model...

    Started by Turkish721‎, 03-16-2011 01:44 PM
    • Replies: 1
    • Views: 3,777
    03-20-2011, 04:54 PM Go to last post
  55. non-nested models in multilevel analysis

    Hi, I have a question on multilevel analysis. I'm reading a book by Kreft & de Leeuw (Introducing Multilevel Analysis). They give an example for a...

    Started by alex92‎, 03-31-2011 08:15 AM
    • Replies: 1
    • Views: 3,775
    03-31-2011, 10:37 AM Go to last post
  56. Linear Discriminant Analysis - Sample size requirements

    As general question, Are 70 observations sufficient to design a reliable decision rule for discriminating between two groups, with a Fisher linear...

    Started by cgmac‎, 06-16-2013 07:29 AM
    discriminant analysis, lda, linear prediction, prediction model, sample size
    • Replies: 3
    • Views: 3,771
    06-16-2013, 12:49 PM Go to last post
  57. How to interpret/present interaction term

    I have survey dataset where I created a knowledge score.There are four possible right answers. I used this as continuous variables, and it checked...

    Started by smd19‎, 02-15-2012 12:41 PM
    • Replies: 2
    • Views: 3,765
    02-15-2012, 03:45 PM Go to last post
  58. Unobserved heterogenity

    This is a signficant problem potentially for Cox and logistic regression. I have never found a test for whether it exists. I doubt there is one, but...

    Started by noetsi‎, 01-26-2015 02:28 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 3,758
    01-27-2015, 02:01 PM Go to last post
  59. Question Regression for nominal variables?

    well, i'm interested if there is some kind of procedure, similar to multiple regression to calculate results for nominal variable with more than two...

    Started by Franz Dobermann‎, 03-10-2009 08:36 AM
    • Replies: 1
    • Views: 3,754
    03-12-2009, 05:47 PM Go to last post
  60. Selecting Variables for Multiple Regression (Univariate Significance Levels)

    Hi All! I really hope someone can answer my question. I am building multiple linear regressions and I am testing salient variables one by one at...

    Started by Pranaphish‎, 08-27-2013 10:18 PM
    multiple regression, p values, regression models, significance, univariate testing
    • Replies: 9
    • Views: 3,754
    08-28-2013, 07:35 PM Go to last post

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