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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Correlation

    Is it possible to correlate two categorical variables? I have a data on building homes in different cities. I want to show correlation on how...

    Started by amanp786‎, 02-08-2014 07:31 PM
    • Replies: 2
    • Views: 1,231
    02-09-2014, 01:39 AM Go to last post
  2. Interpretation of GLM output for binomial family

    Hello everyone, I need help interpreting GLM output for binomial family and determining if this GLM is the correct one to use according to what I...

    Started by mbopi‎, 02-08-2014 10:59 PM
    binary data, binomial, categorical data, generalized linear model
    • Replies: 0
    • Views: 2,247
    02-08-2014, 10:59 PM Go to last post
  3. Improvement of predicitve power in logistic regression - when is it significant?

    I've posted this in another forum before but didn't get answers, so I try it here again I'm running a hierarchical logistic regression to find out...

    Started by Lara87‎, 02-08-2014 04:42 AM
    hierarchical, logistic regression, r-squared
    • Replies: 3
    • Views: 2,106
    02-08-2014, 06:41 AM Go to last post
  4. what shall I do if I find too many significant interaction terms?

    I am estimating a logistic regression model and have developed main effects model. I have found that the interaction of a categorical independent...

    Started by t.wang21@yahoo.com.au‎, 02-06-2014 09:21 PM
    • Replies: 8
    • Views: 2,728
    02-07-2014, 10:06 PM Go to last post
  5. Hierarchical Logistic Regression - classification table info decreasing from block 0?

    Hi there, I have tried to look for a similar question but was unable to find one so am posting. I am carrying out a hierarchical logistic...

    Started by tamsynann‎, 02-07-2014 12:30 PM
    • Replies: 0
    • Views: 2,526
    02-07-2014, 12:30 PM Go to last post
  6. Question Outcome variable in almost 80% of the cases zero. What to do?

    Dear fellow members, I investigate if physical activity is related to learning outcomes in adult students participating in distance learning....

    Started by h.gijselaers‎, 02-07-2014 09:26 AM
    continuous, linear regression, outcome
    • Replies: 0
    • Views: 1,426
    02-07-2014, 09:26 AM Go to last post
  7. 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: 1,150
    02-04-2014, 01:36 PM Go to last post
  8. Overcoming an error in Logistic Regression Analysis with Epi Info

    The normal process for a logistic regression analysis in Epi Info requires steps such as 1.From the Analysis Command Tree, use the READ command to...

    Started by GingerAle‎, 02-03-2014 06:35 PM
    • Replies: 0
    • Views: 2,043
    02-03-2014, 06:35 PM Go to last post
  9. Question Tomographic map of 3D data with a dimension described by probability distribution

    I have a three dimensional data set. Two first components are the exact values of(X,Y) and for the third dimension I have a probability attached to...

    Started by neuronphysics‎, 02-03-2014 10:06 AM
    plotting, probability distribution, statistical analysis
    • Replies: 0
    • Views: 951
    02-03-2014, 10:06 AM Go to last post
  10. interpreting regression analysis

    I'm a little confused as to whether this is a linear relationship and if a regression analysis can be conducted. I have also included the outputs...

    Started by jwils94‎, 02-02-2014 09:33 PM
    • Replies: 1
    • Views: 1,291
    02-03-2014, 08:42 AM Go to last post
  11. Regression for consumer purchase behavior

    Hello, I'm pursuing a project as part of my MBA and while I have some basic stats background I am very new to in-depth regression analysis. I'm...

    Started by macwiz‎, 02-01-2014 08:58 PM
    • Replies: 1
    • Views: 1,519
    02-02-2014, 02:55 PM Go to last post
  12. Limited Continues Variable as Dependent Variable

    Hi All, i'm in dire need of knowing that which regression model is best for me. My dependent variable is a score calculated by some complex method,...

    Started by ranamuhammadazeem‎, 02-02-2014 10:01 AM
    englund, noetsi
    • Replies: 0
    • Views: 1,231
    02-02-2014, 10:01 AM Go to last post
  13. Quadratic terms in a regression

    If you put a quadratic term (variable and variable_sq) into a regression, will they always have opposite signs on their respective coefficients? If...

    Started by oncearunner‎, 01-31-2014 11:38 PM
    • Replies: 2
    • Views: 1,827
    02-01-2014, 06:08 AM Go to last post
  14. Interpreting regression model

    Hello, I want to know what is the best explanation for interpreting this regression model: Ln(urban population)= -1.8 +...

    Started by Bahareh‎, 01-31-2014 05:56 AM
    • Replies: 11
    • Views: 2,023
    01-31-2014, 10:36 AM Go to last post
  15. Difference in ranking values

    Hi all. For my PhD Thesis I have a question asking participants to rank 4 people on the basis of their preference. My supervisor asked me to...

    Started by scandone86‎, 01-31-2014 10:28 AM
    • Replies: 0
    • Views: 870
    01-31-2014, 10:28 AM Go to last post
  16. Difference in Differences in a linear regression framework

    I am looking to incorporate difference in differences (DiD) into a regression framework, and all the examples I have found of such usage in peer...

    Started by mferrigno‎, 01-29-2014 11:48 AM
    • Replies: 1
    • Views: 1,746
    01-29-2014, 09:53 PM Go to last post
  17. How to find beta in a regression model?

    Dear all, This might be a silly question, however I am a newbie when it comes to Stats. Im currently writing my thesis and for this I am analysing...

    Started by crazyaboutstats‎, 01-26-2014 05:03 PM
    • Replies: 11
    • Views: 3,519
    01-28-2014, 01:07 PM Go to last post
  18. Best fit for multiple straight lines

    Hi During a study, I have infused the same amount of a hormone into 10 participants. The blood koncentration of the hormone is measured at fasting...

    Started by MBJ‎, 01-28-2014 10:11 AM
    • Replies: 0
    • Views: 1,302
    01-28-2014, 10:11 AM Go to last post
  19. Quasi-poisson or negative binominal regression with continuous dependent variable

    My dependant variable is originaly count data. Because of many corrections it became continuous variable. Can I still apply quasi-poisson or negative...

    Started by matijas‎, 01-28-2014 09:26 AM
    • Replies: 0
    • Views: 1,368
    01-28-2014, 09:26 AM Go to last post
  20. To zero or not to zero - Count models

    Hi all, I hope you could give me a help in modelling the data I have on the visits to an Emergency Service. I have data on the number of visits...

    Started by PedroR‎, 01-28-2014 07:57 AM
    • Replies: 0
    • Views: 1,070
    01-28-2014, 07:57 AM Go to last post
  21. Matching

    Dear experts, For a fMRI (functional brain scan) experiment, I am comparing scans from 40 subjects with a condition that may or may not affect the...

    Started by andhou‎, 01-27-2014 06:54 AM
    • Replies: 0
    • Views: 1,510
    01-27-2014, 06:54 AM Go to last post
  22. Exclamation HELP: Generate a new dummy variable

    Hey folks, for my master thesis and my logit regression I need to create a dummy variable, but this one is a bit more complex than just a simple...

    Started by canut‎, 01-26-2014 12:40 PM
    • Replies: 2
    • Views: 1,234
    01-26-2014, 02:37 PM Go to last post
  23. What Regression Analysis Should I Employ

    Hi, I would really appreciate some help with this. I am looking to see if employees' organisational history (such as voluntary/involuntary turnover)...

    Started by CA92‎, 01-24-2014 10:48 AM
    anova, regression, regression analysis
    • Replies: 4
    • Views: 1,369
    01-25-2014, 05:17 AM Go to last post
  24. logistic regression: seperate data over time from the same patient

    Hello everyone, I have a database of patients that received surgery. I am planning to do a survival analysis comparing two groups of patients,...

    Started by noob‎, 09-10-2013 06:02 AM
    • Replies: 3
    • Views: 1,485
    01-25-2014, 01:07 AM Go to last post
  25. Why doesn't the through the origin method work?

    I am doing a question on the regression between the number of pizzas and the delivery time. The lowest number of pizzas is 2. I am given the...

    Started by S-C-3-1-3‎, 01-24-2014 02:58 AM
    • Replies: 3
    • Views: 1,455
    01-24-2014, 01:20 PM Go to last post
  26. Do I have a discrete fit parameter if I fit data to the Heaviside step function?

    Hey guys, A question about discrete parameters in a maximum likelihood estimation fit situation: I have seven data points, every data point...

    Started by Hombre‎, 01-24-2014 08:58 AM
    • Replies: 0
    • Views: 748
    01-24-2014, 08:58 AM Go to last post
  27. Finding Least Square Estimates

    Hi, Given Y_i=\beta+\beta x_i^2 +\epsilon_i , I want to find the least squares estimate of \beta . I know I need to minimize ...

    Started by S-C-3-1-3‎, 01-23-2014 07:33 PM
    • Replies: 3
    • Views: 1,187
    01-24-2014, 04:05 AM Go to last post
  28. Logistic Regression - Odd Ratio

    Hi, I have the following two logistic regression models where the independent variables are the same for the two models: logit(Brand1) = b0 + b1...

    Started by fsean‎, 01-23-2014 06:44 PM
    logistic regression
    • Replies: 0
    • Views: 1,799
    01-23-2014, 06:44 PM Go to last post
  29. Do my data meet the assumptions for multiple linear regression?

    ~ There are no outliers in the standard residuals ~ Multicollinearity is not a concern ~ Independent errors are met (Durbin-Watson = 1.95) ~...

    Started by memomemootoo‎, 01-21-2014 02:09 PM
    • Replies: 7
    • Views: 3,312
    01-23-2014, 08:12 AM Go to last post
  30. squared or interaction terms in PCA?

    I'm new to principle component analysis and right now I feel like a 5 year old with a chain saw. I realize the power of PCA, but I don't know how to...

    Started by jtkaff‎, 01-22-2014 04:41 PM
    • Replies: 0
    • Views: 1,678
    01-22-2014, 04:41 PM Go to last post
  31. Post Autoregression model implementation

    Hello forum users! I have a urgent question :/ I need to implement an AR(1) Model into Oxmetrics. Optimize my parameters using the OLS method. ...

    Started by Enies‎, 01-22-2014 01:20 PM
    ar model, ols, oxmetrics
    • Replies: 0
    • Views: 1,551
    01-22-2014, 01:20 PM Go to last post
  32. ANOVA and Multiple Regression DIFFERENT Result

    Using a data set I come up with this problem. The effects of A, B, and their interaction (A B) on Y are tested. The data are analyzed using both...

    Started by fayyazcivil‎, 01-21-2014 12:16 PM
    • Replies: 5
    • Views: 1,914
    01-21-2014, 01:19 PM Go to last post
  33. Error assumptions violated

    I have a data set on which i have been asked to run a regression analysis. However, the data violates the assumption of normality of the errors. At...

    Started by Prometheus‎, 01-21-2014 07:29 AM
    • Replies: 3
    • Views: 1,477
    01-21-2014, 11:44 AM Go to last post
  34. Expected Multicollinearity: Alternative to Regression?

    Hello, I currently extracting a lot of slightly different variables from a Social Network dataset, which I want to regress (or something like...

    Started by szidel‎, 01-21-2014 06:17 AM
    • Replies: 10
    • Views: 2,553
    01-21-2014, 11:30 AM Go to last post
  35. predictor variables with many zeros

    My explanatory variables are count data and some have many zeros. In linear regression variance is increasing with increasing explanatory and...

    Started by matijas‎, 01-20-2014 06:29 PM
    • Replies: 6
    • Views: 2,881
    01-21-2014, 07:38 AM Go to last post
  36. interpreting result of a linear regression

    Sir/Ma'am, I would like to seek your help on interpreting the results i made on the attached file. This was made using data analysis on excel...

    Started by reindrew‎, 01-15-2014 10:29 AM
    • Replies: 4
    • Views: 1,257
    01-21-2014, 06:11 AM Go to last post
  37. should I specify or let GLM estimate the ancillary parameter?

    Hi, I am using GLM negative binomial regression to examine a positively skewed dv. Under Type of Model, there is a subsection of the menu where...

    Started by buggles001‎, 01-20-2014 06:13 AM
    • Replies: 0
    • Views: 1,633
    01-20-2014, 06:13 AM Go to last post
  38. How to estimate the elasticity of demand?

    I'm new to statistics. I don't know how to estimate the own-price elasticity of demand from my data set? Can you show me how to do? Thank you!

    Started by Tiffany‎, 01-19-2014 09:56 AM
    • Replies: 1
    • Views: 1,060
    01-19-2014, 08:10 PM Go to last post
  39. Marginal effect of dummy interactions

    Hi everybody, I am wondering how one can interprete the marginal effect of a dummy that is interacted with a continous variable. The context is...

    Started by Nardo‎, 12-16-2013 04:20 AM
    • Replies: 2
    • Views: 1,548
    01-19-2014, 02:50 PM Go to last post
  40. Large Negative AIC with Forward/Backward Selection

    Hello Everyone! I am a very new member to the forum, and extremely glad to find this lively discussion environment. I am a post-doc in astronomy,...

    Started by moravveji‎, 01-18-2014 05:50 PM
    • Replies: 0
    • Views: 1,487
    01-18-2014, 05:50 PM Go to last post
  41. Help! WLS + Bootstrap

    Hello everyone, I would like to do a weighted-least-squares regression through a nonparametric bootstrap in stata. Does anybody know how this...

    Started by CheersToStata‎, 01-16-2014 07:44 AM
    bootstrap, stata 12, wls
    • Replies: 3
    • Views: 2,150
    01-17-2014, 04:44 AM Go to last post
  42. Transformations in Multiple Regression

    Hi All, Context : Multiple Regression, 2 independent variables (x1, x2) . 1 dependent (Y) If I transform my independent variables there is a...

    Started by Suri‎, 01-16-2014 11:56 PM
    • Replies: 0
    • Views: 1,390
    01-16-2014, 11:56 PM Go to last post
  43. Benefits of converting dependent variable to log form?

    For regression analysis, what is the benefit of converting the dependent variable to log form. I'm using hourly wages as the dependent variable. ...

    Started by dataset‎, 01-16-2014 06:00 AM
    • Replies: 5
    • Views: 2,349
    01-16-2014, 11:11 AM Go to last post
  44. Estimating Confidence Intevals

    Hi, I have used a loglikelihood function to estimate 24 parameters. How do I construct a confidence interval given the Hessian (avaliated on the...

    Started by celiofeltrinjr‎, 01-15-2014 01:40 PM
    confidence interval, maximum likelihood
    • Replies: 2
    • Views: 1,318
    01-15-2014, 11:50 PM Go to last post
  45. Ordinal Probit Regression

    Hi everyone, Will you please help me to write syntax in mathlab, for ordinal probit regression? I have 4 predictors( X1,X2,X3,X4) and one response...

    Started by devi pillai‎, 01-14-2014 02:32 PM
    • Replies: 1
    • Views: 1,754
    01-15-2014, 06:03 PM Go to last post
  46. Regression Assumptions for different time series models

    I am reading a non-statistics book at the moment, which writes about statistics. Not a good constellation, I know. Unfortunately I do not have a...

    Started by consuli1‎, 01-08-2014 01:53 PM
    • Replies: 5
    • Views: 1,947
    01-13-2014, 09:41 AM Go to last post
  47. regression transformation problems

    I am currently writing a dissertation on the causes of regional unemployment. My dependent variable is unemployment rate (%). I plan to carry out...

    Started by kaype‎, 01-11-2014 07:11 PM
    • Replies: 4
    • Views: 1,198
    01-12-2014, 10:54 AM Go to last post
  48. Regression on subpopulation, conditioning on dependent variable

    Hi Everybody, I'm interested in knowing the effect of a explanatory variable x, on a dependent variable y, but only for observations that...

    Started by joans‎, 01-12-2014 12:26 AM
    • Replies: 0
    • Views: 1,151
    01-12-2014, 12:26 AM Go to last post
  49. Linear regression model - collinearity.

    Hello everyone, I'm have a problem with my linear regression model, I really don't know what to do so I've decided to ask you for help. The...

    Started by aldlp‎, 01-11-2014 01:33 PM
    • Replies: 1
    • Views: 1,383
    01-11-2014, 06:49 PM Go to last post
  50. i need solution to regreesion

    hi dear friend i want the solution manual to the regression og montgomery i searched a lot of in the web but i cant find a free one. if...

    Started by pentiom752‎, 01-10-2014 05:05 PM
    • Replies: 0
    • Views: 919
    01-10-2014, 05:05 PM Go to last post
  51. Unhappy Logistic Regression problems

    Hello, I'm stuck with a - i think very basic - problem, but I'm not getting any further for weeks now, thats why I finally decided to ask. I have...

    Started by stame‎, 01-10-2014 01:16 PM
    distances, game damage, logistic regression
    • Replies: 2
    • Views: 1,624
    01-10-2014, 01:50 PM Go to last post
  52. prediction interval for 2nd order regression?

    Greetings my first post here. I found this forum by a Google search you were the top hit. It has been years since I had stats but because of...

    Started by Sparky‎, 01-10-2014 12:09 PM
    • Replies: 0
    • Views: 1,121
    01-10-2014, 12:09 PM Go to last post
  53. Question Modelling percentages in the closed interval [0-1]

    Hi all, I am trying to model percentages which are in the closed interval . Specifically, I am not modelling the probability of a yes/no outcome...

    Started by JohnDoe2014‎, 01-08-2014 06:23 PM
    closed interval, logit, percentages
    • Replies: 11
    • Views: 2,790
    01-10-2014, 11:14 AM Go to last post
  54. RA-Mediation Negative Regression Coefficients

    When comparing regression coefficients for determining if mediation has occurred, do you consider whether the number is negative or positive? I...

    Started by PHDinChange‎, 01-09-2014 06:35 PM
    • Replies: 1
    • Views: 1,237
    01-09-2014, 07:08 PM Go to last post
  55. Multivariate regression in R Commander

    Hey at all, my name ist Max and I have a question regarding to R Commander. I used already the search function but I could not find what I'm...

    Started by maexle11‎, 01-09-2014 04:40 AM
    • Replies: 1
    • Views: 1,265
    01-09-2014, 12:15 PM Go to last post
  56. Simple panel data regression tool for my particular analyis problem

    I am not a specialist in econometric's or linear regression but I am an engineer with a reasonable grasp of mathematics. I need to conduct a linear...

    Started by Justin_A‎, 01-08-2014 03:49 PM
    linear regression, panel data, software
    • Replies: 0
    • Views: 1,061
    01-08-2014, 03:49 PM Go to last post
  57. Multinomial logit with non-independent outcomes?

    Say I have a categorical outcome variable that I want run a logit model on and the outcome variable takes on the following values: 1) A 2) B 3)...

    Started by jorsh‎, 01-07-2014 12:59 PM
    • Replies: 1
    • Views: 1,725
    01-07-2014, 06:05 PM Go to last post
  58. What tests can I use?

    Basically, I have to variables Carbon Monoxide (CO) and Black Smoke. I have to test whether black smoke influences the level of CO in the...

    Started by KimboSlice‎, 01-07-2014 12:20 PM
    correlation, regression, scatterplot, spearman's rank
    • Replies: 1
    • Views: 1,162
    01-07-2014, 06:02 PM Go to last post
  59. Blinder-Oaxaca decomposition- T-stats and Group Indicator Variable

    Hi everyone, I'm currently doing some pooled blinder oaxaca decompositions on ethnic discrimination using the UK LFS data and have two questions....

    Started by mulleyman‎, 01-07-2014 08:54 AM
    • Replies: 0
    • Views: 1,130
    01-07-2014, 08:54 AM Go to last post
  60. Negative Binomial Reg - why changes in significance using one less/similar variables?

    Hi, I am running a NBR on a sample of 500 participants to predict survival rate from a set of health indices eg. diagnosed diabetic, history of...

    Started by buggles001‎, 01-07-2014 06:46 AM
    • Replies: 0
    • Views: 932
    01-07-2014, 06:46 AM Go to last post

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