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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Should we remove non significant 1st order effects when interaction is significant

    My question is simple: When you have a multiple regression equation which is: Y = a0 + a1.X1 + a2.X2 + a12.X1X2 is it correct to remove...

    Started by lbarcelo‎, 12-03-2007 03:05 PM
    • Replies: 4
    • Views: 6,845
    08-20-2012, 10:02 AM Go to last post
  2. Question Extremely large Odds Ratios?!

    Hi, I've conducted a binary logistic regression with 1 independent variable (Type of property: flat/maisnette, terraced, semi-detached, detached and...

    Started by ljohnston86‎, 08-22-2011 03:17 PM
    logistic regression, odds ratios
    • Replies: 4
    • Views: 12,182
    12-13-2012, 10:19 AM Go to last post
  3. Explain the nonsignificance of simple slope analysis (with significant interaction)?

    Hi everyone, I need some help. In a study, I tested an interaction hypothesis and got a significant interaction result (p < .05) and visual...

    Started by lijiesjtu‎, 12-16-2011 08:55 AM
    • Replies: 4
    • Views: 4,577
    08-07-2013, 03:42 PM Go to last post
  4. 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: 3,123
    02-22-2013, 03:34 AM Go to last post
  5. Question ANOVA/MANOVA for a complex data matrix

    Hi friends, I've got a data matrix with 140 rows and 5 columns. Each row represents a unique characteristic of the 5 different plant species. Idea...

    Started by vikie‎, 02-09-2012 06:34 AM
    anova, mlm
    • Replies: 4
    • Views: 2,081
    08-21-2013, 02:20 AM Go to last post
  6. Comparing regression slope intercepts in SPSS

    Hello, my name is Robert Hall and I have got myself in a bit of a pickle with my 3rd year research project. For my project I am looking at the...

    Started by rh241‎, 04-07-2012 02:43 PM
    • Replies: 4
    • Views: 16,053
    07-09-2012, 11:39 AM Go to last post
  7. Interpreting Multiple Regression vs Correlation

    Hi, I'm analysing the results to a satisfaction survey. I want to work out the key drivers of satisfaction so I'm using a question relating to...

    Started by andrew2786‎, 05-23-2012 10:12 AM
    correlation, interpreting results, multiple regression, satisfaction
    • Replies: 4
    • Views: 5,177
    05-28-2012, 05:58 AM Go to last post
  8. Simple question regarding the OLS procedure...

    If I understand this equation correctly, if the transpose of x_i is an n by 2 matrix, then is the matrix x_i a 2 by n matrix? But isn't that a weird...

    Started by lm8ub‎, 06-06-2012 10:50 AM
    • Replies: 4
    • Views: 1,740
    06-06-2012, 11:43 AM Go to last post
  9. Best analysis to use.

    Hi - I am new to using Stats and wanted to know if regression would work in the below scenario. I have two sets of hotel occupancy rates by...

    Started by BB1303‎, 06-25-2012 12:57 AM
    regression
    • Replies: 4
    • Views: 1,989
    06-25-2012, 08:03 PM Go to last post
  10. What are the weaknesses of bootstrapping OLS standard errors?

    What are the weaknesses of bootstrapping OLS standard errors using residuals and pairs bootstrapping methodology? I've seen many sources on this...

    Started by derksheng‎, 08-01-2012 12:07 AM
    • Replies: 4
    • Views: 3,726
    08-02-2012, 10:46 AM Go to last post
  11. Problem with forecasting/data transformation

    Hi, I am looking to forecast ticket sales (the distribution is U shaped with big tails, i.e. a lot of sales happens during the first few days and...

    Started by lulumohca‎, 07-10-2012 10:57 PM
    • Replies: 4
    • Views: 1,709
    07-13-2012, 08:06 AM Go to last post
  12. Multiple regression- kurtosis in DV

    Hey all, This may be a really stupid question. But I'm really stupid when it comes to statistics, so bear with me! My dependent variable has...

    Started by kk89‎, 07-20-2012 11:57 PM
    • Replies: 4
    • Views: 2,446
    07-23-2012, 09:44 PM Go to last post
  13. Logistic Regression Question

    Hi everyone, I have just found this forum (via google) and I wish I had known about it earlier, it seems great! My knowledge of statistics is sadly...

    Started by kdm‎, 07-21-2012 10:03 AM
    • Replies: 4
    • Views: 1,454
    07-21-2012, 04:49 PM Go to last post
  14. dummy variables

    Hello everyone, Regarding my regression model i have several missing observations regarding one of my independent variable, in this case Research...

    Started by slacknoise‎, 07-27-2012 04:39 AM
    • Replies: 4
    • Views: 3,154
    07-27-2012, 06:49 AM Go to last post
  15. What does this mean?

    I ran a regression. One independent variable. One dependent variable. After I finished I got an r-squared of 0.85. Now suppose I do the following...

    Started by rummage‎, 07-30-2012 05:44 PM
    • Replies: 4
    • Views: 2,251
    07-31-2012, 03:03 PM Go to last post
  16. Make predictions with standardized coefficients

    Hello, I've been struggling with a problem since a while, hopefully someone here could help me out. The problem: I want to use the...

    Started by Seko1987‎, 08-21-2012 02:21 PM
    coefficients, multiple regression, prediction, standardization
    • Replies: 4
    • Views: 3,358
    08-21-2012, 08:05 PM Go to last post
  17. Logistic Regression or Chi Square?

    Hi everyone, I am a stats noob and am currently doing my fourth year thesis, examining moral development in children and adolescents. My design so...

    Started by melliehop‎, 08-30-2012 09:28 AM
    • Replies: 4
    • Views: 12,272
    09-03-2012, 08:34 AM Go to last post
  18. Regression Analysis Based on Condition

    Hi there, I am trying to do a regression analysis. My columns looks like this: AA 1 GG 2 AG 2 If the column 2 contains "2" so...

    Started by AsoInfo‎, 09-02-2012 12:49 AM
    conditional regression, regression analysis
    • Replies: 4
    • Views: 2,336
    09-02-2012, 11:59 PM Go to last post
  19. number of hours worked squared

    Hello, My dependent variable is logged annual income. One of my independent variables is experience squared (the number of hours worked per...

    Started by sombrerodraco‎, 09-12-2012 09:41 PM
    • Replies: 4
    • Views: 1,507
    09-13-2012, 01:08 AM Go to last post
  20. Lightbulb How to define partial support

    I have 6 statistical tests which make up one hypothesis - one is significant, can I say that the hypotheses has partial support?

    Started by richieboy‎, 09-19-2012 11:54 AM
    • Replies: 4
    • Views: 2,350
    09-22-2012, 10:33 AM Go to last post
  21. Why is there perfect multicollinearity in this regression?

    Hi Everybody, I will simplify my problem to make this all more clear. Suppose I have three countries (1, 2 and 3) and I have data on migration...

    Started by Salohcin‎, 10-03-2012 03:58 PM
    • Replies: 4
    • Views: 2,846
    10-03-2012, 05:02 PM Go to last post
  22. Issue with missing data

    Hi all, I am working on a dataset that include 12K+ firm-level data for 30+ countries. I have both firm-level variables (each firm within country...

    Started by lucas111‎, 10-10-2012 09:27 AM
    missing data
    • Replies: 4
    • Views: 1,909
    10-16-2012, 05:55 AM Go to last post
  23. Quick question on Fixed / Random effects

    Hi all, Can someone please let me know if Fixed Effects / Random Effects (by introducing dummies) can be applied to a regression WITHOUT using...

    Started by lucas111‎, 10-16-2012 03:41 AM
    • Replies: 4
    • Views: 1,663
    10-17-2012, 03:29 AM Go to last post
  24. Correcting lack of fit

    I have a very simple data set with a single regressor that has all negative values. The data set provides no context, only values. When testing...

    Started by zicke01‎, 10-20-2012 03:18 PM
    • Replies: 4
    • Views: 2,039
    10-21-2012, 02:01 PM Go to last post
  25. Zero-inflated continuous independent variables

    Are there ways of handling zero-inflated continuous independent variables?

    Started by doh_ramey‎, 11-01-2012 08:22 AM
    • Replies: 4
    • Views: 6,052
    11-01-2012, 10:44 AM Go to last post
  26. Skewed dependent variable in logistic regression-how to handle

    I am conducting research on juvenile firesetting with a child's self report of firesetting as my dependent variable.(0= never played with or set...

    Started by chbowling‎, 11-07-2012 08:48 PM
    skewness regression
    • Replies: 4
    • Views: 6,638
    11-08-2012, 07:18 PM Go to last post
  27. SPSS- logistic regression, three patient groups, ROC curve

    Hi all, I have three groups of patients, and 6 variables for each patient. I want to combine these variables and make a multiclass ROC curve, in...

    Started by PaulineB‎, 11-09-2012 09:21 AM
    • Replies: 4
    • Views: 10,875
    11-11-2012, 09:54 AM Go to last post
  28. multiple regression categorical variable and different slopes

    Hi All, Iím trying to run multiple regression with 2 independent variables and one categorical variable (two levels: male vs. female). The...

    Started by mcdomell‎, 11-28-2012 08:50 AM
    separate slopes
    • Replies: 4
    • Views: 2,045
    11-30-2012, 05:13 AM Go to last post
  29. Excel and StatPlus to do Multiple Regression

    Hi all--I would be grateful for any help with this! I am doing my statistics research project on whether or not there is a correlation b/w where...

    Started by Belle‎, 11-29-2012 05:26 PM
    • Replies: 4
    • Views: 9,834
    11-30-2012, 12:39 PM Go to last post
  30. how do i do this final project =(

    1) Sale prices of apartments. The data is saved in the SALES file. A Minneapolis, Minnesota, real estate appraiser used regression analysis to...

    Started by mikem11‎, 12-10-2012 12:05 PM
    • Replies: 4
    • Views: 2,808
    12-10-2012, 04:47 PM Go to last post
  31. what test should be used to tell if two regression lines are significantly different

    I have two lines in a x-y plot 1. observed migration distance (y) and predicted migration distance (x) (Y=0.95X+0.31, the slope coefficient and the...

    Started by helenekuo‎, 04-28-2013 07:47 AM
    linear, regression
    • Replies: 4
    • Views: 3,397
    04-29-2013, 02:26 PM Go to last post
  32. finding the autocovariance function for exp(x)

    I want to find the autocovariance function of y(t) = exp(x(t) which is a nonlinear time series. When I try to find the autocovariance function I...

    Started by lord12‎, 01-16-2013 10:32 AM
    • Replies: 4
    • Views: 2,656
    01-16-2013, 05:44 PM Go to last post
  33. How to analyze data with more than one associated categorical dependent variables?

    I have some dependent variables related to the growth of a company having categories like (e.g. for variables indicating net profit, financial...

    Started by Blain Waan‎, 04-25-2013 10:17 PM
    gee, multivariate analysis, multivariate logistic reg, multivariate regression
    • Replies: 4
    • Views: 2,334
    04-26-2013, 10:56 AM Go to last post
  34. Find standard error of mean

    Suppose you have a process x_{t} = \mu +w_{t} -0.8*w_{t-1} where w_{t} ~ wn(0,\sigma_{w}^2). How do I calculate the standard error of var(\bar{x})...

    Started by lord12‎, 01-16-2013 05:52 PM
    • Replies: 4
    • Views: 1,667
    01-24-2013, 07:47 PM Go to last post
  35. how to get a 'main effect' from dummy coded variables?

    Hello everyone! Thank-you for all the responses I got for my previous thread. I think I am now able to work on something. I have a question, however,...

    Started by will22‎, 01-22-2013 04:27 PM
    • Replies: 4
    • Views: 1,692
    01-22-2013, 05:10 PM Go to last post
  36. Logistic regression

    Hello I just ran a logistic regression on some data I have. The response is binary (0/1) and the independent variable is categorical with 3...

    Started by NN_STAT‎, 12-27-2012 05:45 AM
    • Replies: 4
    • Views: 2,114
    12-30-2012, 07:55 PM Go to last post
  37. Quality of regression

    Hey, i made a linear regression between two datasets of the form y=mx+b. I calculated m and b with a formula that is typical for this data. But...

    Started by jdm_dm‎, 01-09-2013 05:00 PM
    linear regression, quality
    • Replies: 4
    • Views: 1,746
    01-10-2013, 04:04 AM Go to last post
  38. Interpreting SAS Output for Regression

    Hi-- I am a complete newbie to statistics, so please talk to me as though I am a six year old child when you are explaining things to me :) I had...

    Started by SophiePaquin‎, 03-10-2013 11:45 PM
    • Replies: 4
    • Views: 13,648
    03-12-2013, 12:12 PM Go to last post
  39. 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: 2,093
    02-13-2013, 02:38 PM Go to last post
  40. Trouble with GLMs (Using R)!

    Greetings! I've been trying to analyse some data for a while now, and I have found what I think the best model for my GLM is. However, I have friends...

    Started by Haggis‎, 12-30-2012 04:08 PM
    • Replies: 4
    • Views: 1,542
    01-02-2013, 04:52 PM Go to last post
  41. Logistic Regression - Equation

    Hi! I run a logistic regression, and i know that it can be written as Pr(y=1)=F(a+b_1*x+b_2*z). With y being the dependent variable, a the...

    Started by bizzzar‎, 01-24-2013 05:39 AM
    fixed-effects, logistic regression, notation, panel
    • Replies: 4
    • Views: 1,997
    01-28-2013, 02:02 AM Go to last post
  42. How Does One Interpret Interactions in Logistic Regression Using SPSS?

    Hello Everyone, I am definitely not stats saavy and have been able to run a logistic regression with the help of a manual. The manual doesn't...

    Started by Student T‎, 03-04-2013 10:50 PM
    • Replies: 4
    • Views: 16,596
    03-10-2013, 09:39 AM Go to last post
  43. 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: 3,032
    02-19-2013, 02:46 PM Go to last post
  44. Dichotomized predictor with dichotomized response

    I have a dichotomized predictor which can be 0 or 1 and it predicts correctly roughly 80% of the time if a patient is cured 1 or not 0. I tried...

    Started by blogzter‎, 01-28-2013 01:39 PM
    • Replies: 4
    • Views: 1,875
    01-29-2013, 12:50 PM Go to last post
  45. Intuitive Serial Correlation

    Hi, could anyone tell me if they think this graph of residuals against time shows potential signs of positive or negative serial correlation. ...

    Started by GGT‎, 03-17-2013 09:37 AM
    • Replies: 4
    • Views: 2,229
    03-17-2013, 03:36 PM Go to last post
  46. question~sum of (residual*Xi)

    Hi, I know it might sound stupid but I do not understand why the fact that sum of residuals equals zero implies the sum of (residual i*Xi)...

    Started by dandelion‎, 01-26-2013 01:04 AM
    • Replies: 4
    • Views: 6,301
    01-27-2013, 03:18 AM Go to last post
  47. Probit/Logit independent variables

    Hello, My DV is a binary variable (Yes/No) and I am using a logit/probit regression analysis. As for my independent variables,there are three...

    Started by Athinagoras‎, 04-20-2013 07:45 AM
    logit model, probit regression
    • Replies: 4
    • Views: 1,590
    04-23-2013, 11:29 PM Go to last post
  48. 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: 5,428
    03-01-2013, 03:15 AM Go to last post
  49. Multiple Linear Regression: Outlier

    Ok folks, so I am doing a multiple linear regression. I am not a statistics expert by any means, and it is part of a psychology report. The last time...

    Started by Rik398‎, 03-06-2013 01:13 PM
    • Replies: 4
    • Views: 2,413
    03-07-2013, 02:16 PM Go to last post
  50. 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: 2,209
    03-27-2013, 08:43 AM Go to last post
  51. Non normal residuals and heteroskedasticity

    Iím running a multiple regression model with 5 predictors (n >1000). Looking at the output the model fits the data well and the predictors behave as...

    Started by loops22‎, 05-09-2013 08:40 AM
    • Replies: 4
    • Views: 1,318
    05-09-2013, 11:02 AM Go to last post
  52. Interaction, moderaton and regression

    I am facing a problem with my analysis. I have two dichotomous moderators between two continuous IV (violation perception) and DV (anger) variables....

    Started by atiah‎, 05-21-2013 08:05 AM
    • Replies: 4
    • Views: 1,474
    06-28-2013, 12:34 PM Go to last post
  53. Multi-Factors model - Linear regression on Market Size

    Dear all, I'm working on a multi factors model analysis to come up with a formula to estimate market size of some countries based on several...

    Started by dudumomo‎, 05-20-2013 10:02 AM
    • Replies: 4
    • Views: 3,425
    05-22-2013, 12:46 PM Go to last post
  54. Strange Wald Chi Square Value

    I ran a logistic regression model with 46 IV and 405 usable cases (and yes I know that is a lot of IV but for what I was doing it was required). In...

    Started by noetsi‎, 05-20-2013 12:49 PM
    • Replies: 4
    • Views: 1,717
    05-21-2013, 04:04 PM Go to last post
  55. Logistic Regression

    Helo I am faced with a problem which looks to be a clear case of logistic regression. A dependent variable(binary in nature) needs to be...

    Started by Abhijeet30‎, 06-08-2013 11:20 AM
    • Replies: 4
    • Views: 2,200
    06-10-2013, 12:14 PM Go to last post
  56. Predict race outcome off expert predictions of outcome

    Hi, I'm new to this forum and found a late 2011 discussion of the relevance of regression analysis of rank outcome interesting. I have used...

    Started by MartyQ‎, 06-12-2013 01:06 PM
    • Replies: 4
    • Views: 1,829
    06-12-2013, 03:05 PM Go to last post
  57. My Moderator is Group= can I still standardise it??

    Please help!! I am trying to do moderated regression after failed attempts at MANOVAs, and am having an issue with my moderator variable... I...

    Started by Lolly‎, 08-07-2013 07:45 AM
    • Replies: 4
    • Views: 1,408
    08-10-2013, 10:36 AM Go to last post
  58. Time series regression books

    Hi, I am interested in Time series regression and I would like to find 1-2 good books that explain Time series with examples using SAS. Does...

    Started by szm‎, 08-14-2013 06:41 AM
    book, regression, sas, time series
    • Replies: 4
    • Views: 4,547
    08-21-2013, 09:37 AM Go to last post
  59. Preprocessing Variables before Regression

    I have variables x1,x2,x3 and result y. I have a problem that multiple tuples of variables are matched with a single y. For example x1 x2 x3 ...

    Started by gungor‎, 08-24-2013 05:09 AM
    • Replies: 4
    • Views: 1,875
    08-24-2013, 12:11 PM Go to last post
  60. Cool negative binomial regression coefficients and exp(b)

    Thank you so much anyone... I have the results of a negative binomial where the DV is the log count of meals obtained. I have continuous predictors...

    Started by LidoBeach‎, 08-23-2013 10:59 PM
    exp(b), interpreting output, negative binomial, regression, spss
    • Replies: 4
    • Views: 5,197
    08-27-2013, 09:28 AM Go to last post

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