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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. about control variable

    Dear All, I have a question here. when I put control my variable in my multiple regression in spss, why the result is the same as that of no...

    Started by wohu‎, 06-08-2011 01:06 AM
    • Replies: 2
    • Views: 2,304
    06-24-2011, 02:04 PM Go to last post
  2. 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: 1,630
    03-01-2015, 09:26 PM Go to last post
  3. Accuracy of prediction?

    Right, I've got some data for variable X and variable Y in 2002. Using Simple Linear Regression, I've made a model which uses variable X to...

    Started by fdsa ytre‎, 03-20-2013 04:58 PM
    • Replies: 1
    • Views: 1,564
    03-20-2013, 05:51 PM Go to last post
  4. Question Adaptive Lasso and CrossValidation for SNV selection

    Hello everyone, I have available 17 000 variables (SNV frequencies, a certain number of zeros) for 40 patients. Each patient is represented by its...

    Started by CorentinR‎, 12-13-2016 07:29 AM
    adaptive-lasso, cross-validation, high throughput, variable selection
    • Replies: 3
    • Views: 2,733
    12-13-2016, 11:51 AM Go to last post
  5. 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: 3,817
    02-25-2011, 11:23 AM Go to last post
  6. Adding a control increases the impact of focal predictor -- sign of what?

    Hello dear forum members! I have recently been working on a mediation analysis, in which inclusion of an additional variable (say, C1) implies...

    Started by kiton‎, 10-24-2016 10:48 PM
    • Replies: 3
    • Views: 1,813
    10-25-2016, 10:17 AM Go to last post
  7. Adding dummy variables let significance of coefficients disappear

    Hi all I have a regression with two variables x1 and x2, both are significant. When I add a dummy variable D (which is significant), one of the...

    Started by weasel‎, 08-22-2014 04:22 AM
    • Replies: 3
    • Views: 2,331
    08-22-2014, 07:14 AM Go to last post
  8. Adding main effects when main effects model is insignificant

    Hi, I have a linear model where both main effects are insignificant, and an overall insignificant model. Should I stop just stop there, or can I...

    Started by bryantw‎, 11-05-2015 05:57 PM
    • Replies: 1
    • Views: 925
    11-05-2015, 07:31 PM Go to last post
  9. 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: 5,492
    12-18-2015, 07:26 PM Go to last post
  10. Adding up the coefficients of a contemporaneous and a once-lagged variable

    Hello, I'm stuck on what's probably a trivial problem, but I can't figure out how to go about it as I am a semi-beginner, so I would really...

    Started by econlearner‎, 12-01-2012 07:46 PM
    lagged effects, regression, standard error
    • Replies: 0
    • Views: 1,663
    12-01-2012, 07:46 PM Go to last post
  11. Additive - Multiplicative and Non Linear Regression

    Hello, Let us say that we have a dependent binary variable expressing the occurence and non occurence of an event. We also have a number of...

    Started by zarasandreas‎, 10-21-2012 12:20 PM
    • Replies: 0
    • Views: 2,422
    10-21-2012, 12:20 PM Go to last post
  12. Additive regression question

    Currently, I'm trying to create a regression equation that can help my boss predict employee hours for the upcoming month. Basically, if we already...

    Started by treystasio‎, 06-21-2010 08:31 PM
    • Replies: 3
    • Views: 2,917
    06-25-2010, 01:54 PM Go to last post
  13. Addressing Heteroskedasticity: OLS (robust), OLS [aweight], VWLS (w/omega)

    Hello dear forum member, Your recent help with my model specification has been invaluable. I also followed your advise on reading the book by...

    Started by kiton‎, 01-31-2015 04:04 PM
    • Replies: 8
    • Views: 1,383
    02-03-2015, 01:16 PM Go to last post
  14. Addressing unequal error variance

    AKA heteroskedacity Other than logging (when that works) and WLS, which I commonly lack the information or intelligence to use, what is the...

    Started by noetsi‎, 02-04-2014 12:10 PM
    • Replies: 4
    • Views: 1,151
    02-04-2014, 01:36 PM Go to last post
  15. Adjust for which confounders

    Hello! I have done a logistic regression to compare pregnancy rates amongst various ordinal categories of a specific blood hormone measurement....

    Started by t3nnam‎, 10-23-2013 04:22 AM
    • Replies: 4
    • Views: 2,568
    10-23-2013, 10:58 AM Go to last post
  16. Adjusted R-squared

    Hi, I have a few questions. If I am doing linear regression with only one independent variable, is it ever viable to present an adjusted...

    Started by haralds‎, 09-18-2014 01:57 PM
    bootstrap simulation, linear regression
    • Replies: 6
    • Views: 2,504
    09-19-2014, 09:55 PM Go to last post
  17. adjusting a proportion score (controling for age)

    I have 20 yes/no ratings (did this product help you). People were able to rate as many of the 20 products as they used (on average people rated 5...

    Started by chinaplate‎, 12-15-2008 10:19 PM
    • Replies: 8
    • Views: 4,355
    12-15-2008, 11:23 PM Go to last post
  18. Adjusting for gender in total brain volume

    Is there a way to adjust for the effect of gender on the outcome measure - brain volume without using it as just a co-variate. i.e. can I transform...

    Started by deeo‎, 09-18-2013 05:45 PM
    • Replies: 0
    • Views: 1,917
    09-18-2013, 05:45 PM Go to last post
  19. Adjusting survey data that is taken at diffrent timepoints

    Hi all, I am trying to analyze the differences between two groups in the result of a psychometric survey after they have been affected by a...

    Started by ilike‎, 03-09-2009 07:16 AM
    • Replies: 2
    • Views: 2,539
    03-10-2009, 07:51 AM Go to last post
  20. advanced method to compare regression coefficient

    Hello, I am regressing two butterfly richness variables (summer and winter) against a set of environmental variables separately. ...

    Started by helenekuo‎, 08-06-2010 05:52 PM
    • Replies: 5
    • Views: 4,384
    08-07-2010, 05:35 AM Go to last post
  21. 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: 3,758
    12-05-2011, 03:26 PM Go to last post
  22. Advice is needed about log.regression and research group

    hello, I have started my first journey to logistic regression, and i have already got my first problem. so, my SPSS merged file contains: -...

    Started by badibad‎, 10-11-2013 01:48 PM
    • Replies: 8
    • Views: 1,369
    10-11-2013, 04:51 PM Go to last post
  23. Advice on OLS analysis

    Hello Everyone, I’m writing a paper on the relationship between weather on daily public bike share system usage. I’m looking for a bit of advice...

    Started by bikingman‎, 12-14-2016 12:59 PM
    ordinary least squares
    • Replies: 0
    • Views: 1,879
    12-14-2016, 12:59 PM Go to last post
  24. Advice on Regression Model Using PROC GLM in SAS

    Hi Everyone, thanks for your insight on this. I will try to explain my data set as well as possible. One of the models I am running on my data...

    Started by becca05meg‎, 02-21-2014 08:39 PM
    model, multiple regression, proc glm
    • Replies: 0
    • Views: 1,062
    02-21-2014, 08:39 PM Go to last post
  25. age groups vs continous

    hello everyone, I am curious to know if there are any best practices when dealing with age variables for a logistic regression model. I currently...

    Started by swoonef‎, 07-14-2014 02:06 PM
    • Replies: 5
    • Views: 2,368
    07-15-2014, 07:06 AM Go to last post
  26. Age-adjusted incidence rate ratios using Poisson regression

    Hi All- I want to set up a SAS model for Poisson regression that will give me the age-adjusted incidence rate ratio for the incident cancer rate in...

    Started by kijohnson‎, 07-07-2014 12:46 PM
    • Replies: 0
    • Views: 2,779
    07-07-2014, 12:46 PM Go to last post
  27. Aggregating or Pooling Multinomial Logistic Regression Coefficients

    I'm trying to recreate the MNL analysis like this paper or this one. In Excel I have a sheet with my choice column which contains the market share...

    Started by airflorida‎, 10-29-2013 12:09 AM
    logistic regression
    • Replies: 1
    • Views: 1,619
    10-31-2013, 05:35 PM Go to last post
  28. AIC backward selection - control variables

    Hej! I have a question concerning AIC backwards selection. I am doing a Linear Mixed effect model where I have one main predictor and several...

    Started by puenktchen‎, 10-06-2015 09:37 AM
    • Replies: 2
    • Views: 1,318
    10-06-2015, 12:26 PM Go to last post
  29. AIC computation

    (1) Compute the Akaike Information Criterion (AIC) value for the linear regression model Y = b0 + b1*X1 + b2*X2 + b3*X3. The regression model was...

    Started by shane414‎, 04-26-2017 06:25 AM
    regresiion, regression analysis
    • Replies: 0
    • Views: 879
    04-26-2017, 06:25 AM Go to last post
  30. AIC for evaluating transformations

    I was just reading an article that seemed to say they used AIC to evaluate continuous variable transformations, I guess in a logistic model. I am...

    Started by hlsmith‎, 12-04-2015 10:13 PM
    • Replies: 1
    • Views: 1,246
    12-15-2015, 09:39 AM Go to last post
  31. Question AIC for models weighted

    Have to choose the best fit between different model. model.list <- list (model1 = nls (y ~ (a * exp (b * x)), data = dat, weights = n, start = list...

    Started by ksantos95‎, 05-28-2013 10:47 AM
    • Replies: 0
    • Views: 1,130
    05-28-2013, 10:47 AM Go to last post
  32. 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: 3,872
    01-23-2011, 07:31 PM Go to last post
  33. Airline Stock Regression

    Hi guys, I'm trying to run a regression with daily airline stock returns as dependent variable. I've included jet fuel price and the stock market...

    Started by rocker‎, 03-18-2013 08:01 AM
    • Replies: 0
    • Views: 1,703
    03-18-2013, 08:01 AM Go to last post
  34. Alcoolimetric Table

    Any idea for estrapolation data for this table? I have read spec gravity= 0.8013 what will the content of Alcool? ...

    Started by crimelist‎, 05-20-2016 09:10 AM
    • Replies: 0
    • Views: 1,222
    05-20-2016, 09:10 AM Go to last post
  35. Algebraic Definition of Residuals from a Regression

    I just need a hint on how to get started on this. Any advice? Define the residual from a regression (one independent variable) algebraically and...

    Started by cassetete‎, 03-01-2011 09:07 AM
    regression analysis
    • Replies: 1
    • Views: 3,199
    03-02-2011, 01:31 PM Go to last post
  36. All for one, one for all categorical variable?

    Hi everyone, I'm working on a classification model with logistic regression. Here are two independent variables we are looking at: id, sales,...

    Started by Oberon‎, 11-08-2013 11:48 PM
    • Replies: 1
    • Views: 1,259
    11-12-2013, 08:23 AM Go to last post
  37. 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: 5,652
    10-03-2013, 06:21 PM Go to last post
  38. All possible sub-sets regression in SPSS

    Hi there, I’d like to do an “all possible sub-sets” regression analysis in SPSS with six parameters to model my dependent vbl, but am not very savvy...

    Started by l3a9k‎, 07-06-2011 01:43 PM
    • Replies: 0
    • Views: 2,873
    07-06-2011, 01:43 PM Go to last post
  39. 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: 1,501
    08-25-2015, 10:13 AM Go to last post
  40. Alternative to Hausman test? Fixed-/Random-Effects with robust SEs

    Hi everyone! After reading loads and loads of material about tests, I have still not been able to come up with a satisfying solution to my probem....

    Started by plotz‎, 06-29-2011 10:59 AM
    • Replies: 0
    • Views: 3,558
    06-29-2011, 10:59 AM Go to last post
  41. Alternatives to ANCOVA? Unequal slopes.

    Hello, and thank you for your help on my question. My goal is to compare multiple groups to determine if a certain "variable of interest" is...

    Started by mgranatosky‎, 01-19-2016 11:04 PM
    • Replies: 5
    • Views: 1,736
    01-20-2016, 03:55 PM Go to last post
  42. Alternatives to logistic regression when the number of cases is low

    Hi All I got involved in my first foray into logistic regression, but have come to realize that I probably can't use it. Let me tell you about my...

    Started by kimwg‎, 03-26-2013 05:10 PM
    binomial, chi-square, fisher's exact test, multiple comparisons, sample size
    • Replies: 4
    • Views: 2,199
    03-27-2013, 08:43 AM Go to last post
  43. Alternatives to Poisson regression for overdispersed count data

    Hi all, I'm currently analyzing data from a series of behavioral experiments that all use the following measure. The participants in this...

    Started by forscher‎, 05-04-2012 11:20 AM
    count data, poisson mean/variance, poisson regression
    • Replies: 6
    • Views: 2,390
    05-04-2012, 11:52 AM Go to last post
  44. AM I allowed to do this?

    Basically i have a binary variable called DP ( takes values 0 or 1) that i had to drop from my multiple regression due to few observations with of...

    Started by pad1w07@soton.ac.uk‎, 09-18-2008 07:36 AM
    • Replies: 1
    • Views: 2,257
    09-22-2008, 06:06 PM Go to last post
  45. Am I doing binary logistic regression correctly?

    Hi all, I have data relating to the presence or absence of electrolytes in water, and the volume of water drunk. I need to do an analysis to see...

    Started by Sciencekid‎, 10-31-2010 07:51 AM
    • Replies: 0
    • Views: 2,767
    10-31-2010, 07:51 AM Go to last post
  46. Am i understanding Regression analysis? Theory question

    Lets say, I have a list of all the hall of fame outfielders in MLB history. Along with data on, fielding ability, OBP, etc. Can I set up a...

    Started by morid22‎, 01-17-2012 03:05 PM
    • Replies: 1
    • Views: 2,419
    01-17-2012, 04:01 PM Go to last post
  47. Ambulance utilisation: help choosing a method

    Hi, I need some advice in selecting a statistical test please. I am researching ambulance utilisation rates at a population level (defined by a...

    Started by john_martin‎, 02-04-2015 05:16 PM
    • Replies: 8
    • Views: 1,933
    02-06-2015, 04:57 AM Go to last post
  48. AMOS OUTPUT - Interpreting results for moderation

    Hello! Please some one help me interpret and put in writing the results (attached as images) from AMOS for moderation analysis. Please I need...

    Started by Zainab‎, 08-20-2016 02:47 AM
    • Replies: 1
    • Views: 2,049
    08-22-2016, 06:52 PM Go to last post
  49. An easy question about Generalized Linear Model

    Hello everyone, I just started using GLM and was stuck by an easy question of GLM. If I already obtain the estimates of the parameters, let's...

    Started by copyfriend‎, 07-18-2011 01:11 PM
    • Replies: 4
    • Views: 2,357
    07-18-2011, 02:02 PM Go to last post
  50. An R question about GLM

    I want to predict a set of proportions from a linear regression using glm in R. The model has a logit link but I want extract the variance-covariance...

    Started by crispin‎, 02-24-2011 04:36 AM
    r logit
    • Replies: 0
    • Views: 2,182
    02-24-2011, 04:36 AM Go to last post
  51. Analyse a variable as continuous and as categorical

    Hello everybody I performed a univariate analysis of a set of predictors. My plan was to include the significant predictors in a multivariate cox...

    Started by noob‎, 11-20-2014 04:01 PM
    • Replies: 3
    • Views: 1,903
    11-21-2014, 08:14 AM Go to last post
  52. 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: 3,885
    08-01-2012, 04:42 AM Go to last post
  53. Analysing a designed experiment - is the theory wrong?

    hi, just had a scary thought . in all industrial DoEs we definitely have measurement error on the IVs. However I have always seen the OLS as the...

    Started by rogojel‎, 07-17-2016 12:06 AM
    • Replies: 11
    • Views: 1,359
    07-18-2016, 11:07 AM Go to last post
  54. Analysing failure proportions

    Hi, Please can anyone help, I have this data attached - I need to find the average mileage at when the headlights fail ( headlight lifetime) ...

    Started by LizR‎, 06-09-2013 02:53 PM
    • Replies: 0
    • Views: 2,279
    06-09-2013, 02:53 PM Go to last post
  55. Question Analysing Panel Poisson Coefficients

    Hi, I'm running a panel poisson regression with fixed effects in Stata. The result in Stata doesn't display a constant. Normally I use standard...

    Started by Vinn‎, 06-14-2013 10:05 AM
    analysis help, coefficient, fixed effect, panel, poison regression
    • Replies: 0
    • Views: 1,556
    06-14-2013, 10:05 AM Go to last post
  56. Analysis of a longitudinal study where interventions are received at different times

    I have a data set of university students. The university has 8 different assisting programs, mostly like scholarships, for needy students to help...

    Started by Blain Waan‎, 10-20-2014 02:08 PM
    longitudinal study, regression analysis, repeated measures
    • Replies: 2
    • Views: 1,551
    10-23-2014, 04:56 AM Go to last post
  57. Analysis of Data over time?

    Hi! I am investigating animal social networks and I have long term data set spanning 15 years. I have looked at each animals 'network position'...

    Started by Emma2415‎, 12-13-2010 06:31 AM
    • Replies: 0
    • Views: 3,183
    12-13-2010, 06:31 AM Go to last post
  58. Analysis of data set derived from simulation

    I'm an engineer working for an architecture firm, and I'm currently trying to analyze some data I've derived from a parametric building simulation I...

    Started by jeemang‎, 11-19-2009 06:50 PM
    • Replies: 0
    • Views: 1,943
    11-19-2009, 06:50 PM Go to last post
  59. Analysis of model outputs

    Hey there, I'm looking for some help/advice about a problem that I would like to tackle. I have a set of input-output (X-y) data. The aim of...

    Started by discostews‎, 08-19-2010 09:49 AM
    • Replies: 2
    • Views: 2,250
    08-19-2010, 12:41 PM Go to last post
  60. Question Analysis of multiple dependent variables of different sample sizes

    Thanks in advance for your help, I'm not a statistician, so I'm struggling to understand the best way to analyse some biological data, and I...

    Started by StatLess‎, 04-19-2017 09:32 AM
    • Replies: 0
    • Views: 464
    04-19-2017, 09:32 AM Go to last post

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