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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Searching for analysis that would compare two trends of data

    Hello, glad to be here. I am looking for an appropriate statistical analysis to address a problem similar to the one described below: Lets say I...

    Started by sosna‎, 02-24-2013 06:04 PM
    correlation, curve estimation, regression, trends
    • Replies: 4
    • Views: 5,406
    03-01-2013, 03:15 AM Go to last post
  2. (SPSS) Multinomial Logistic Regression- testing IIA- Hausman-McFadden

    hi all, I am using SPSS 20 to analyze survey data. I am using Multinomial Logistic Regression and have come up with three "models", containing...

    Started by Syd‎, 02-25-2013 08:26 PM
    iia
    • Replies: 2
    • Views: 7,736
    02-28-2013, 09:08 PM Go to last post
  3. change sign estimate manually because of underlying theory

    *****the thread should be: change sign observations variablebecause of underlying theory****** (sorry for the mistakes in the previous version of...

    Started by lukeskywalker84‎, 02-27-2013 04:31 PM
    change, estimate, ols, sign, theory
    • Replies: 0
    • Views: 1,629
    02-27-2013, 04:31 PM Go to last post
  4. Principal component analysis problem

    Hi, My question is about Principal component analysis(PCA). Suppose we have five variables X1,X2,X3,X4 and X5 (all are correlated). We find five PCA...

    Started by Arumairajan‎, 02-25-2013 02:33 PM
    • Replies: 1
    • Views: 1,520
    02-25-2013, 02:49 PM Go to last post
  5. mean squares

    SS(Res) = 215.61 D.f. = 2 MS(Res) = 107.81 What does MS(Res) exactly represent and implicate?

    Started by ueon‎, 02-24-2013 12:24 PM
    • Replies: 2
    • Views: 2,086
    02-24-2013, 02:45 PM Go to last post
  6. goodness of fit test for nonlinear, nonmonotonic data.

    I have a dataset which I believe can be modelled by a sinusoidal regression with increaing mean (in time series). I have performed spectral...

    Started by katlin‎, 02-24-2013 11:48 AM
    • Replies: 0
    • Views: 2,344
    02-24-2013, 11:48 AM Go to last post
  7. Non significant constant in cubic polynomial regression

    Hi, When examining the confidence intervals for my constant in a cubic regression analysis I noticed that they include the value of 0 and...

    Started by stats-student‎, 02-22-2013 10:57 AM
    • Replies: 1
    • Views: 1,894
    02-23-2013, 10:44 PM Go to last post
  8. Four level dependent variable.

    I have a four level dependent variable which is at least ordinal (its likert scale) and may be interval (that is the distance between each level may...

    Started by noetsi‎, 02-22-2013 11:20 AM
    • Replies: 1
    • Views: 1,744
    02-23-2013, 10:43 PM Go to last post
  9. Is there a residual plot for logit regression?

    Hello All, I know one can view a residual plot with OLS, and the plot will show if there is a pattern or not from the residuals. Is there...

    Started by Windows7‎, 02-23-2013 07:39 PM
    • Replies: 0
    • Views: 1,929
    02-23-2013, 07:39 PM Go to last post
  10. elimination of 0-values in multiple regression

    hi there ... i am running a multiple regression analysis to where the independant variables are various types of food consumed, and the dependent...

    Started by jamesprasad7‎, 02-23-2013 11:24 AM
    • Replies: 0
    • Views: 1,633
    02-23-2013, 11:24 AM Go to last post
  11. Confident intervals not so confident at all... what went wrong?

    I'm doing a linear regression analysis with 3 predictors and 76 cases. So far, everything is going smooth. R^2 = 0.95. So, I let SPSS calculate...

    Started by Junes‎, 02-22-2013 02:10 PM
    • Replies: 3
    • Views: 2,449
    02-22-2013, 04:48 PM Go to last post
  12. Ordinal logit assumptions

    I am working with a four-level ordinal dependent variable (i.e., never, once-twice, several times, very often). I have been running generalized...

    Started by mbiz‎, 02-22-2013 12:12 PM
    • Replies: 0
    • Views: 1,903
    02-22-2013, 12:12 PM Go to last post
  13. project data points to straight line

    I have a lot of data from seismic experiment.I need to project points from crooked line to straight line,classical least squares estimates does not...

    Started by Milenko‎, 02-22-2013 11:52 AM
    • Replies: 1
    • Views: 2,077
    02-22-2013, 12:03 PM Go to last post
  14. Post Logistic Regression: To dummy code or not to? Which backward elimination to use?

    I have 10 binary dependent variables (disease prevalence: yes/no, 1/0). I want to do a logistical regression with each of them with the following...

    Started by Daedalus‎, 02-21-2013 12:13 PM
    backward elimination, binary variables, dummy coding, logistical regresion
    • Replies: 5
    • Views: 16,392
    02-22-2013, 11:13 AM Go to last post
  15. Non Linear Regression: Overlay scatterplot of results

    Hi, I wonder if anyone could give me some guidance as to how to create an overlay scatterplot that will demonstrate which of three regression...

    Started by stats-student‎, 02-19-2013 03:45 PM
    • Replies: 1
    • Views: 2,337
    02-22-2013, 10:51 AM Go to last post
  16. Criterion for outliers

    Hi, I have a simple question, what's the best way to report the criterion you used to identify outliers? I used casewise diagnostics, outliers...

    Started by stats-student‎, 02-21-2013 12:32 PM
    • Replies: 4
    • Views: 3,108
    02-22-2013, 03:34 AM Go to last post
  17. Two-level regression and weights

    Hi, I'm trying analyze a two-level binary logistic (level-1=individuals and level-2=states) regression model with the PEW Religious Landscape...

    Started by fanxiong‎, 02-21-2013 03:52 PM
    • Replies: 0
    • Views: 1,863
    02-21-2013, 03:52 PM Go to last post
  18. Model to predict new points

    Can anyone help me build a model which can predict a set of new (x,y) point given existing points. The data represents intended touch points which...

    Started by my_username‎, 02-21-2013 12:24 PM
    • Replies: 0
    • Views: 1,764
    02-21-2013, 12:24 PM Go to last post
  19. regression with binary predictors and continuous outcome

    Hi all, I performed a principal coordinate anaysis on a distance matrix from binary (presence - absence expressed as 1 and 0) variables. Now, I'm...

    Started by Marco777‎, 02-21-2013 06:15 AM
    • Replies: 0
    • Views: 1,814
    02-21-2013, 06:15 AM Go to last post
  20. binary independent and binary dependent variables

    Hi all, Is it possible to run a regression with binary independent variables and binary dependent variables. i.e 0 & 1 value ind variables and 0...

    Started by Windows7‎, 02-20-2013 10:19 PM
    • Replies: 8
    • Views: 3,563
    02-21-2013, 12:44 AM Go to last post
  21. How to find accuracy between forcasted and Actual value..

    Hi... I have monthly actual and forecasted data. I have to see accuracy between them. In this case, which statistical method is applicable to see...

    Started by Poonam‎, 02-20-2013 08:22 PM
    • Replies: 1
    • Views: 1,880
    02-20-2013, 08:25 PM Go to last post
  22. "Adjusting" logistic regression model

    I'm trying to predict response to a direct mail campaign, but there will be multiple campaigns, each having a different "topic" (eg, home remodeling,...

    Started by jawon‎, 02-20-2013 05:43 PM
    • Replies: 2
    • Views: 2,744
    02-20-2013, 06:43 PM Go to last post
  23. Building separate logistic regression models

    Hi all, I am building a binary logistic regression model. I am not sure if using the variables as interactions is a better choice than building...

    Started by nikhil_s‎, 02-17-2013 02:56 PM
    • Replies: 2
    • Views: 2,561
    02-20-2013, 06:14 PM Go to last post
  24. Repeated measures regression

    Hi, I have data from an experiment with a continuous dependt variable and two dicotomous independent variable. All measures are repeated within...

    Started by espenmei‎, 02-20-2013 03:43 PM
    regression analysis, repeated measures
    • Replies: 0
    • Views: 1,531
    02-20-2013, 03:43 PM Go to last post
  25. I need ideas for building a "customer-centric" model

    I'm just starting down this path so forgive me for being vague and maybe not even asking the right questions. The goal: I would like to build a...

    Started by jawon‎, 02-14-2013 02:37 PM
    • Replies: 4
    • Views: 3,016
    02-19-2013, 02:46 PM Go to last post
  26. Random Variable

    Dear all, My question is let X be a random variable. If X=0 what is the value for E(X)? (is this always zero?) Mr.Sivaraj.

    Started by Arumairajan‎, 02-19-2013 02:04 AM
    • Replies: 3
    • Views: 2,220
    02-19-2013, 09:40 AM Go to last post
  27. Question Effect Coding: p-value of reference category

    Hi, I fit a regression model with effect coded variables. I'm well aware of how to compute the value for the reference category but I have...

    Started by Chris25‎, 02-18-2013 03:39 AM
    effect coding, p-value, regression, standard deviation
    • Replies: 2
    • Views: 4,232
    02-19-2013, 03:38 AM Go to last post
  28. Dependent variable is on a four point scale

    I have a dependent variable on a four point satisfaction scale. It is clearly at least ordinal in nature, it may be interval although we are not...

    Started by noetsi‎, 02-18-2013 10:59 AM
    • Replies: 0
    • Views: 2,395
    02-18-2013, 10:59 AM Go to last post
  29. More than 2 categorical variable+1 continuous variable as independent variable

    I am a civil engineering student and have no relation with statistics. Now I am working on my master thesis and I have got to work on SPSS now, which...

    Started by sobhit.chemmannur‎, 02-18-2013 06:03 AM
    categorical data, coefficient, regression
    • Replies: 2
    • Views: 4,729
    02-18-2013, 10:21 AM Go to last post
  30. Standardized Regression Equation

    Hello, I'm trying to figure out something I'm sure it is a simple answer to many people here. I standardized my X and Y variables and I...

    Started by masstartaglia‎, 02-15-2013 06:18 PM
    • Replies: 1
    • Views: 2,058
    02-18-2013, 07:32 AM Go to last post
  31. Cook's distance for nonlinear regression

    Cook's distance was used to detect outliers in a linear regression model. But is it ok to use it with non-linear regression model?

    Started by khara‎, 02-17-2013 06:58 PM
    • Replies: 0
    • Views: 3,496
    02-17-2013, 06:58 PM Go to last post
  32. Fitting confidence interval lines in R using the predict function

    Hi everyone, I am currently attempting to fit confidence interval lines to a regression model in R, but every time I try to for example add a +2...

    Started by rd123‎, 02-17-2013 05:33 AM
    confidence interval, predict function, r code help, r coding, r confidence intervals
    • Replies: 0
    • Views: 2,435
    02-17-2013, 05:33 AM Go to last post
  33. Testing heteroskedasticity of error variance

    Hello, I'm trying to test the heteroskedasticity of the error variance by using BP test and Non-constant variance score test. However, I get very...

    Started by childofforest‎, 02-16-2013 01:18 AM
    • Replies: 0
    • Views: 2,680
    02-16-2013, 01:18 AM Go to last post
  34. Segmenting a Logistic Regression Model

    Hi All, I am trying to build a Logistic Regression model . In my model i have 4 different variables( with 3 levels each) on which i am trying to...

    Started by ashukla‎, 02-15-2013 06:32 PM
    • Replies: 0
    • Views: 1,488
    02-15-2013, 06:32 PM Go to last post
  35. Regression Analysis and Hypothesis Testing

    Can someone please help me out with these questions. Thanks guys. Yhat = 227.3642 + 6.4075Xt Σ (Xt - Xbar)^2 = ΣXt^2 ≈33.43 σ2≈35.4198 Xbar =...

    Started by Georgepass‎, 02-14-2013 08:25 AM
    • Replies: 12
    • Views: 3,956
    02-15-2013, 03:46 PM Go to last post
  36. Reducing Number of Categorical Variables

    I have an abundant amount of categorical variables pertaining to an epidemiological study. I need to filter these down to a succinct list and wish to...

    Started by Rob_Stats‎, 02-13-2013 06:01 PM
    categorical data
    • Replies: 1
    • Views: 2,360
    02-14-2013, 04:30 PM Go to last post
  37. Generating correlated predictors data and dependent data in r

    Dear all, I need correlated both predictors data and dependent data in r. My problem is given as follows. We adopt a p=4 parameter model and...

    Started by Arumairajan‎, 02-05-2013 01:19 PM
    • Replies: 2
    • Views: 1,658
    02-14-2013, 01:04 PM Go to last post
  38. Multiple Linear Regression

    Hi Folks, I have completed all the analysis for my dissertation, which looks at the relationship between phonologica errors made by 5 - 11 year...

    Started by Rik398‎, 02-13-2013 10:34 AM
    • Replies: 4
    • Views: 2,083
    02-13-2013, 02:38 PM Go to last post
  39. Logistic regression failed to converge

    For one of my data sets the model failed to converge. I am sure this is because I have to few data points for logistic regression (only 90 with about...

    Started by noetsi‎, 02-12-2013 07:45 PM
    • Replies: 3
    • Views: 4,515
    02-12-2013, 09:16 PM Go to last post
  40. OLS regression with dummy dependent AND independent vars

    Disregarding whether probit / logit should be used - I just want to verbally interpret results from an OLS regression where my dependent variable y...

    Started by kbmertz‎, 02-12-2013 02:12 PM
    • Replies: 6
    • Views: 2,884
    02-12-2013, 09:15 PM Go to last post
  41. Interpetation of Ordinal Logistic regression parameter

    I am using effect coding and have a question on the interpetation of a p value for individual parameters of a categorical predictor (which SAS breaks...

    Started by noetsi‎, 02-12-2013 11:37 AM
    • Replies: 8
    • Views: 2,471
    02-12-2013, 05:07 PM Go to last post
  42. Question Multiple Regression interpretation

    y=β0+β1x1+β2x2+β3x3 Price = year + (difference between actual miles and average miles, x-xbar) + (year * difference between actual miles and average...

    Started by trinibm‎, 02-11-2013 09:34 PM
    beta coefficients, interpretation, multiple, multiple regression, regression
    • Replies: 1
    • Views: 1,795
    02-12-2013, 11:27 AM Go to last post
  43. Controlling for group differences of no interest - regression, ANCOVA, neiter?

    Have been hunting around for a while and thought I ask here: Using SPSS, I have a continuous interval DV (test performace) and one four-level...

    Started by eeeparsnip‎, 02-09-2013 11:52 AM
    • Replies: 1
    • Views: 1,776
    02-11-2013, 04:09 PM Go to last post
  44. Multinomial Regression - predicting probabilities

    Hi, I have responses to a questionnaire on patient experience. My aim is to add a component of this questionnaire (on communication) to an...

    Started by VicB‎, 02-09-2013 10:28 AM
    • Replies: 1
    • Views: 1,759
    02-11-2013, 10:27 AM Go to last post
  45. Untrue Panel Data and Logistic Regression

    Hi all, For full disclosure, I am not particularly well trained when it comes to statistics or econometrics but I am familiar with the basics. ...

    Started by Newbie_1‎, 01-11-2013 08:27 PM
    • Replies: 3
    • Views: 2,294
    02-10-2013, 08:55 PM Go to last post
  46. Question Comparing ln(y) =bX vs. OLS and other count data models

    My data is a balanced panel. 12 years X 600 ids/year X 12 months = 864,000 observations. For about 150 of my 600 ids, at a certain point in this...

    Started by figuringout‎, 02-08-2013 08:17 PM
    count data, log, ols, regression, stata
    • Replies: 0
    • Views: 3,155
    02-08-2013, 08:17 PM Go to last post
  47. Multicollinearity in Time Series Data

    Hello all, this is my first post here -- hoping to find some helpful advice, and hope to dispense some in the future. Here is my situation: I am...

    Started by seanodlum‎, 02-05-2013 05:58 PM
    attribution, multicollinearity, regression
    • Replies: 2
    • Views: 4,753
    02-08-2013, 01:44 PM Go to last post
  48. Interpretation of odds ratio in logistic regression for a logged variable

    Hello, How do we interpret the odds ratio in logistic regression for a logged variable? Thanks in advance.

    Started by zarasandreas‎, 02-05-2013 06:58 AM
    • Replies: 6
    • Views: 3,114
    02-08-2013, 08:43 AM Go to last post
  49. What form of regression to use

    I have four level DV. It is ordinal and the distances between each level may be the same (I am not sure). My inclination is to use some form of...

    Started by noetsi‎, 02-07-2013 03:35 PM
    • Replies: 3
    • Views: 1,915
    02-07-2013, 05:30 PM Go to last post
  50. Combining panel (10 years of data) and survey data (1 year) in one regression

    Quick question regarding a problem I am having: My research explores determinants of municipal recycling behavior, evaluating the effects of...

    Started by caltech27‎, 02-07-2013 01:23 PM
    • Replies: 0
    • Views: 2,501
    02-07-2013, 01:23 PM Go to last post
  51. Multiple Regression: real-world example

    Everyone in my Advanced Stats class is completely stuck on this assignment, I don't know where else to turn... Using the paper/article "Predictors...

    Started by pr6758‎, 02-07-2013 07:31 AM
    multiple regression, regression
    • Replies: 3
    • Views: 9,491
    02-07-2013, 01:07 PM Go to last post
  52. Smile query regarding generalized linear models

    hello all, I have a query regarding GZLMs. I have a variable A non-normally distributed and I also take the logA, which is normally distributed to...

    Started by 7xen‎, 02-07-2013 10:37 AM
    • Replies: 2
    • Views: 1,706
    02-07-2013, 12:22 PM Go to last post
  53. Motion and rotation analysis (two positions on a rigid body to calculate rotation)

    Hello all, I'm currently a undergrad university student doing research and I'm anaylising some position data. The data is a time-series' of...

    Started by gge‎, 02-07-2013 07:14 AM
    best fit, kinematics, position, regression, rotation
    • Replies: 0
    • Views: 1,126
    02-07-2013, 07:14 AM Go to last post
  54. stuck in SPSS with multiple non-linear regression

    Hello everyone. So, I've been stuck for several days with an assignment. I was asked to compare 2 models for a relationship between 2 variables....

    Started by azurerider‎, 02-06-2013 07:22 AM
    • Replies: 0
    • Views: 3,084
    02-06-2013, 07:22 AM Go to last post
  55. Fixed Effects or Random Effects for finding determinants of expenditure

    Hi! I am doing a paper on the determinants of healthcare expenditure for the elderly. I have panel data for income and expenditure for a period of 10...

    Started by BNB‎, 12-10-2012 12:41 PM
    • Replies: 2
    • Views: 1,185
    02-06-2013, 05:59 AM Go to last post
  56. Estimating the error term variance without fitting a regression line

    There's a question in my regression class I'm having trouble with. We are basically given 6 points (5,y1), (5,y2), (10,y3), (10, y4), (15,y5),...

    Started by mn1987‎, 02-05-2013 08:41 PM
    • Replies: 2
    • Views: 2,845
    02-05-2013, 09:12 PM Go to last post
  57. Linear regression of complex survey data using proc surveyreg, normality??

    Hi, I'm trying to do a linear multivariate model of a continuous outcome (minutes per week of physical activity). The data I'm using was collected...

    Started by debosaldo‎, 02-05-2013 05:28 PM
    • Replies: 0
    • Views: 914
    02-05-2013, 05:28 PM Go to last post
  58. Normality assumption for Regression

    I have an outcome variable that is composed of one item on a 3 point scale to assess participation (none-1, member of 1 program-2, member of both...

    Started by agrig12‎, 02-05-2013 12:00 PM
    normality, regression assumption
    • Replies: 6
    • Views: 2,083
    02-05-2013, 04:04 PM Go to last post
  59. Help with simple comparing regression results

    Hey guys, I am revising for an exam in a few days and I have pretty much most stuff covered other then a couple of things, and my teacher has emailed...

    Started by supergt‎, 02-04-2013 12:03 PM
    • Replies: 6
    • Views: 1,190
    02-05-2013, 01:21 PM Go to last post
  60. Linear regression: question about correlation

    Hello, Please look at the attached Excel, On the same sheet, I put both the correlation and regression results. Dependent variable in column A,...

    Started by GIS‎, 02-05-2013 06:24 AM
    • Replies: 0
    • Views: 948
    02-05-2013, 06:24 AM Go to last post

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