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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Beginner's question: Is profit/loss data always ratio in nature? How to treat it?

    Hello, I'm afraid this is another beginner's question. I've only recently grasped the fundamentals of linear and multiple linear regression and I...

    Started by MrPink‎, 12-21-2016 08:43 AM
    beginner, lineal model, ratio
    • Replies: 3
    • Views: 469
    12-21-2016, 06:06 PM Go to last post
  2. Random intercept only for 1 subgroup in lmer

    Dear all, suppose I have a case study with 3 different populations, A, B and C. For all groups I have data on, e.g. body mass, length and sex of a...

    Started by Luke‎, 12-21-2016 03:30 AM
    • Replies: 2
    • Views: 440
    12-21-2016, 12:12 PM Go to last post
  3. Calculating probabilities from logit parameters estimated with effect coding

    Hello, I calculated this multinomial logit model using an effect coding (-1 0 1). The variable edu3 is the education level (3 categories), sex has...

    Started by Demographer‎, 12-21-2016 03:39 AM
    • Replies: 0
    • Views: 365
    12-21-2016, 03:39 AM Go to last post
  4. 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 09:14 AM
    moderation, process, spss
    • Replies: 2
    • Views: 766
    12-19-2016, 08:35 AM Go to last post
  5. 3-way ANOVA for paired groups and repeated measures or a GEE

    Hi! I need help for data analysis of my masters.I work with awake rats in pharmacology experiments. In my experiment I have some groups of treatment...

    Started by igsimoes‎, 12-17-2016 07:26 AM
    • Replies: 2
    • Views: 457
    12-18-2016, 11:01 AM Go to last post
  6. When to use Augmented Dickey Fuller test vs Dickey Fuller Test - Time series

    Checking a variable for I(1) process, when should i use a ADF vs DF test?

    Started by maasi007‎, 12-17-2016 10:01 AM
    arma, dickey fuller augmented, dickey fuller test, time series, time series analysis
    • Replies: 1
    • Views: 355
    12-17-2016, 12:30 PM Go to last post
  7. Trying to think of alternative methods to approaching my model for dynamic pricing

    Right now i run a pricing experiment where 25%of users get one of 4 random prices. After collecting sufficient data, I split my data into training...

    Started by bball3212‎, 12-16-2016 10:37 AM
    • Replies: 0
    • Views: 383
    12-16-2016, 10:37 AM Go to last post
  8. help in model

    I have a data set like that ID Wight age sex season region response 1 60 40 1 4 2 1000 2 65 ...

    Started by mosthamed‎, 12-16-2016 05:35 AM
    • Replies: 1
    • Views: 364
    12-16-2016, 09:00 AM Go to last post
  9. Repeated Measures model with Covariates

    Hi Everyone, i am struggling with finding a good way to analyze a dataset. The design is this: I have 25(n) subjects, all of them are tested in an...

    Started by cecilia‎, 12-15-2016 04:49 AM
    categorical, covariate, model, multiple regression, repeated measures
    • Replies: 1
    • Views: 387
    12-16-2016, 02:23 AM Go to last post
  10. How to calculate residual covariance in R

    I know it is may be a silly question but I am looking for an answer if I fitted a linear model c<- lm (y~ a+ b) I need to get the residual...

    Started by mosthamed‎, 12-15-2016 06:45 AM
    linear model
    • Replies: 1
    • Views: 419
    12-16-2016, 02:18 AM Go to last post
  11. Linear Regression - Beginner Need Help

    Hello everyone, I have a simple exercise to do about linear regressions and models but I have a few doubts. The exercise gives you 2 vectors(let's...

    Started by dieselonthecouch‎, 12-14-2016 10:38 AM
    • Replies: 4
    • Views: 494
    12-14-2016, 03:04 PM Go to last post
  12. 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: 350
    12-14-2016, 12:59 PM Go to last post
  13. 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: 500
    12-13-2016, 11:51 AM Go to last post
  14. SEM versus multiple regression?

    Hello. I have a within-subjects longitudinal design with two time points. There are two DVs and 3 IVs. All are measured at both time points. I used a...

    Started by morlei‎, 12-13-2016 10:27 AM
    • Replies: 1
    • Views: 391
    12-13-2016, 10:41 AM Go to last post
  15. Mixed effects using nlme in R

    If I include an interaction (time*score) in my model the main effect (score) is significant. However, if I remove the covariate (time), the effect...

    Started by Palermo‎, 12-05-2016 05:55 PM
    • Replies: 3
    • Views: 574
    12-13-2016, 03:44 AM Go to last post
  16. mixed effects influence of interaction

    Can someone confirm that the following are correct. I'm trying to model both the random intercept and random intercept/slope models. Random...

    Started by Palermo‎, 12-12-2016 11:15 PM
    • Replies: 2
    • Views: 336
    12-13-2016, 03:25 AM Go to last post
  17. Logistic Regression Output

    Hey All, Can someone help me make sense of this Minitab output? A few questions I had are: What does the odds ratio statistic mean? what does...

    Started by MaxPowers‎, 12-11-2016 11:16 PM
    • Replies: 3
    • Views: 432
    12-13-2016, 01:44 AM Go to last post
  18. Poverty analysis and multiple linear regression

    Hi. I have a dataset and I intend to use multiple linear regression analysis with excel since the dataset isn't that massive in volume, just about...

    Started by auroraborealis‎, 12-12-2016 07:37 AM
    regression analysis
    • Replies: 0
    • Views: 355
    12-12-2016, 07:37 AM Go to last post
  19. Urgent: data format in regression analyses

    Hi all, I'm suffering a lit bit with some data I have to analyse (my first time...) and I have many doubts. We manipulated 3 IVs that were shown...

    Started by Phoolan_D‎, 12-10-2016 11:13 PM
    • Replies: 0
    • Views: 367
    12-10-2016, 11:13 PM Go to last post
  20. Regression with two data sets?

    I have two data sets. Set 1 contains daily flights and delay data: Flight Date Carrier Departure Delay, ranging from 0 to 1650 minutes. ...

    Started by kdsan‎, 11-01-2016 10:49 PM
    • Replies: 1
    • Views: 441
    12-10-2016, 10:35 PM Go to last post
  21. Lightbulb Need help with data for regression analysis

    I have extracted the following values from Draper and Smith (1998) for independent variable X, dependent variable Y for regression analysis: ...

    Started by Johsins69‎, 11-22-2016 12:17 PM
    • Replies: 2
    • Views: 471
    12-10-2016, 10:09 PM Go to last post
  22. LinearRegressionQuestions

    Hello, Can someone please help with Question 1.3 onwards in the attached file. Thanks, AJ

    Started by analyticsjane‎, 12-10-2016 07:50 AM
    • Replies: 0
    • Views: 369
    12-10-2016, 07:50 AM Go to last post
  23. Interpretation Interaction Term

    Hey, maybe you could help me with this interpretation (i'm learning with the slides). The model is about employment chances and the independen...

    Started by Hansbusch‎, 12-09-2016 06:23 PM
    • Replies: 0
    • Views: 303
    12-09-2016, 06:23 PM Go to last post
  24. Table interpretation (odds)

    Can someone help me interpret and understand this table? The question is: What effect does the age have on the odds for bodyweight=1 for persons who...

    Started by dymatize‎, 12-08-2016 08:14 AM
    • Replies: 2
    • Views: 363
    12-09-2016, 05:06 PM Go to last post
  25. conditional logit model_help with data interpretation

    0 down vote favorite I have performed a clogit following the instruction of Aizaki et al.2012 but I am not sure on how to interpret some results...

    Started by senzu‎, 12-08-2016 12:13 PM
    clogit, coefficient, logit model
    • Replies: 4
    • Views: 398
    12-09-2016, 09:26 AM Go to last post
  26. Logistic Regression - Predicted Probabilities with unknown variables

    Hi all, I'm wondering about how to calculate predicted probabilities using a binary logistic regression model when one or more of the variables in...

    Started by augustin‎, 12-06-2016 05:21 PM
    logistic regression
    • Replies: 2
    • Views: 387
    12-07-2016, 10:11 AM Go to last post
  27. Hello, I need some help please with two problems

    Hey guys, I have been struggling in this class and I am down to the last week, I have to pass this homework and extra credit problem to pass the...

    Started by run2rush2112‎, 12-02-2016 10:11 PM
    • Replies: 2
    • Views: 503
    12-04-2016, 08:13 PM Go to last post
  28. Regression for comparing two groups on one variable? And t-test with survey data?

    Hi - I have two populations / groups that I need to compare on one variable. Now usually I would use a t-test or anova but ive been told that...

    Started by TruroJP‎, 11-30-2016 05:01 PM
    analysis, anova, regression, t-test
    • Replies: 2
    • Views: 392
    12-02-2016, 04:41 PM Go to last post
  29. Multiple Logistic Regression question

    Greetings, I have three categorical IVs and one categorical DV. However, the DV is a self-reported ranking from 1 to 4 (1= not important, 4 = very...

    Started by Luxor‎, 11-30-2016 02:29 PM
    • Replies: 4
    • Views: 386
    12-01-2016, 01:46 PM Go to last post
  30. Which analysis represents better the "worse-ness" of my linear regression?

    Hello all, If I have two sets of data points, for instance: 1 10 2 14 3 17 4 12 5 19

    Started by mode1111‎, 11-28-2016 03:34 PM
    linear regression, statistical analysis
    • Replies: 2
    • Views: 361
    11-29-2016, 07:12 AM Go to last post
  31. P-value for a regression where expected slope is 1:1

    Hi, I am comparing two values for vegetation cover from two time periods. The expected value is y=x for the slope. I am curious how to calculate a...

    Started by drm258‎, 11-23-2016 07:09 PM
    • Replies: 6
    • Views: 544
    11-26-2016, 09:40 AM Go to last post
  32. Repeated measures question

    Hello. I have taken day to day repeated measures in number of predictor variables as well as some other ordinal dvs. I want to meaure the effect of...

    Started by LEMONIAS‎, 11-20-2016 06:56 PM
    • Replies: 4
    • Views: 556
    11-24-2016, 12:39 PM Go to last post
  33. Least squares estimate of alpha and beta

    My group have different opinions towards the following question: Find the least squares estimate of alpha and beta of the mechanistic growth...

    Started by acc_aac‎, 11-24-2016 05:02 AM
    nonlinear regression
    • Replies: 1
    • Views: 369
    11-24-2016, 10:23 AM Go to last post
  34. How to compute r squared in linear mixed model

    It's kind of urgent. i need to hand out my thesis in 3 days from now :/ Can someone explain me how to computer r squared in linear mixed model? i...

    Started by tal_spi‎, 11-24-2016 10:11 AM
    • Replies: 0
    • Views: 330
    11-24-2016, 10:11 AM Go to last post
  35. Standard Regression Analysis / urgent help for stats beginner.

    Hi Guys! I'm fairly new to statistics and am conducting a standard regression analysis with 1 predictor variable ( following from a pearsons...

    Started by Valeriosmith‎, 11-22-2016 06:50 AM
    • Replies: 5
    • Views: 408
    11-22-2016, 12:57 PM Go to last post
  36. Nominal vs. Ordinal

    Say i'm using age groups which are not equal in size and interval (1-2,2-4,5-8years) is it better when using a regression model to set this variable...

    Started by avisev‎, 11-20-2016 04:47 PM
    • Replies: 3
    • Views: 414
    11-21-2016, 04:40 PM Go to last post
  37. Poission with random effects

    Hi, I have two levels in my poission regression model with random effects (children and family level) which predicts count data after i get the...

    Started by avisev‎, 11-20-2016 04:37 PM
    • Replies: 0
    • Views: 314
    11-20-2016, 04:37 PM Go to last post
  38. Help with multilevel multinomial logistic regression and missing data

    Hi all - I would really appreciate some thoughts/advice. I'm working with survey data containing individual responses nested within a number of...

    Started by mattas‎, 11-16-2016 04:42 PM
    • Replies: 0
    • Views: 544
    11-16-2016, 04:42 PM Go to last post
  39. Insignificant interaction effect in regression vs. scatterplot indicating interaction

    Hallo, I'm new to this forum and hope I can make my problem clear. I conducted a multiple regression analysis to, among other things, test the...

    Started by Norbert22‎, 11-16-2016 09:41 AM
    • Replies: 1
    • Views: 303
    11-16-2016, 10:46 AM Go to last post
  40. Exclamation What experimental design would be most appropriate?

    In my study I have two study groups: Group A is composed of X subjects which are either males or females, and every subject is characterized by...

    Started by sylnyapi‎, 11-15-2016 01:18 PM
    • Replies: 0
    • Views: 329
    11-15-2016, 01:18 PM Go to last post
  41. logistic regression or survival analysis?

    Hello, I have two main questions that I hope you help me answer. Let me give you the scenario first. Let’s say that some students in a school are...

    Started by Marvin85‎, 11-14-2016 04:44 PM
    controlling for time, survival analysis, time post
    • Replies: 4
    • Views: 424
    11-15-2016, 10:41 AM Go to last post
  42. Question How to parameterize this crazy data?

    So, a colleague of mine, who is a survey methodologist, is proposing to do an experiment on a survey. * The purpose of the experiment is to see...

    Started by SabbyATL‎, 11-14-2016 07:00 PM
    parameterization
    • Replies: 0
    • Views: 298
    11-14-2016, 07:00 PM Go to last post
  43. Post-Hoc Power Analysis (G*Power) for simple linear regression

    Hey everyone! I conducted a simple linear regression with non-significant results. Now I would like to analyze the power of this calculation using...

    Started by nziza‎, 11-11-2016 07:00 AM
    effect size, g*power, post-hoc, power analysis, simple linear regression
    • Replies: 0
    • Views: 426
    11-11-2016, 07:00 AM Go to last post
  44. Thumbs up Exam pass rate analysis

    Hi, looking for some help with some analysis I am looking at on Minitab for exam pass marks. I have a data set which shows global student...

    Started by iannimmo‎, 11-10-2016 11:38 AM
    • Replies: 1
    • Views: 360
    11-10-2016, 11:47 AM Go to last post
  45. Have 4 dependent and 10 independent variables - which test should I use?

    Hi all, I'm interested in the potential effects of water pollution on feather color of a bird. For this, I calculated 4 color variables for each...

    Started by NatL‎, 11-09-2016 04:47 PM
    dbrda, linear regression, multivariate analysis, permanova, ridge regression
    • Replies: 0
    • Views: 345
    11-09-2016, 04:47 PM Go to last post
  46. please help me make sense of my multilevel linear regression [R]

    Hi everyone, I'm trying to wrap my head around multilevel (or mixed-effect) models, but not quite succeeding. I have the following data from a...

    Started by Junes‎, 11-07-2016 03:46 PM
    multilevel
    • Replies: 0
    • Views: 376
    11-07-2016, 03:46 PM Go to last post
  47. Correlation with residuals of regression

    Hi all, Let's say I have one DV (X) and 5 IV's, A, B, C, D and E. I'm specifically interested in the effect of E. I could perform a regression...

    Started by AnLo‎, 11-04-2016 09:07 AM
    • Replies: 3
    • Views: 409
    11-07-2016, 10:18 AM Go to last post
  48. Red face Test for comparing correlation values. The winner is?

    Hi everyone, my problem is relatively simple, but trivial. I've already read some topics about that, but I really need straightforward answers...

    Started by smndpln‎, 11-05-2016 05:36 AM
    compare coefficients, correlations, neurosciences, regression analysis
    • Replies: 2
    • Views: 453
    11-05-2016, 07:10 AM Go to last post
  49. Urgent: SPSS multiple regression moderator analysis

    Hello everybody, I am glad I found my way to this forum! There seem to be a lot of SPSS pros here! :) I hope I can learn a bit! I am currently...

    Started by PhilST‎, 11-02-2016 01:04 PM
    • Replies: 3
    • Views: 541
    11-03-2016, 04:32 AM Go to last post
  50. Calculating predicted probabilities from a logistic regression model SPSS

    Hello everyone, I am trying to calculate individual predicted probabilities from a logistic regression model with SPSS (to describe how a individual...

    Started by kranas‎, 10-30-2016 01:08 PM
    logistic regression, probabilities
    • Replies: 6
    • Views: 736
    11-01-2016, 04:52 PM Go to last post
  51. Calculation of parameter uncertainties when using method of least squares

    Hi everyone, I am struggling with a maybe simple problem. I have a set of data points (x,y) for which I would like to derive a fitting function of...

    Started by bordercollie2‎, 07-29-2016 05:59 AM
    • Replies: 1
    • Views: 469
    11-01-2016, 05:41 AM Go to last post
  52. Multinomial regression: how to interpret results

    Hello Everyone, I'm currently writing my master's dissertation and i'm having two main issues. 1) The first one is related to the attached...

    Started by GiuliaCarbone‎, 10-30-2016 04:41 PM
    • Replies: 4
    • Views: 425
    10-31-2016, 02:57 PM Go to last post
  53. Help with my hierarchal regression

    Hi Guys I'm accomplishing a hierarchal regression for my thesis and I'm a bit stumped. My hierarchal regression is trying to assess the link...

    Started by lewiss009‎, 10-22-2016 10:05 AM
    • Replies: 3
    • Views: 435
    10-30-2016, 02:51 AM Go to last post
  54. bootstrap regression question

    I have a slightly different twist on the normal application of bootstrapping and regression. Here’s the problem… I have a population of people...

    Started by signalMTB‎, 10-19-2016 09:48 PM
    • Replies: 1
    • Views: 392
    10-28-2016, 09:09 AM Go to last post
  55. Relative Weights Analysis | Any good step-by-step guides out there?

    I am trying to conduct relative weights analysis on employee engagement data to prioritize where our org focuses its efforts. I'm running SPSS...

    Started by statsean‎, 10-25-2016 03:03 PM
    relative weights analysis
    • Replies: 0
    • Views: 258
    10-25-2016, 03:03 PM Go to last post
  56. 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 11:48 PM
    • Replies: 3
    • Views: 443
    10-25-2016, 11:17 AM Go to last post
  57. How to use Akaike's Information Criterion (AIC) for manual model reduction?

    Hi all, I wondered if anybody can explain to me how I can use the AIC for manual reduction of my GLM. I calculate a GLM with the following...

    Started by Fred.‎, 10-24-2016 07:52 AM
    • Replies: 1
    • Views: 483
    10-24-2016, 11:58 PM Go to last post
  58. Cross-sectional dependence, heteroskedasticity and serial correlation

    *** solved

    Started by Wooly‎, 10-24-2016 03:51 PM
    cross-sectional, econometrics
    • Replies: 0
    • Views: 304
    10-24-2016, 03:51 PM Go to last post
  59. Basic Estimation; Should I use future data?

    Hi everyone, I'm new on the forum but had a question to ask that's related to the work I currently do. I'm wondering if we should include...

    Started by Edorian‎, 10-04-2016 07:54 PM
    • Replies: 4
    • Views: 601
    10-23-2016, 11:24 PM Go to last post
  60. Comparison of one outcome to all the other outcomes

    Here is some data to play with set.seed(1e4) color = factor(c(rep("blue",20), rep("red",20), rep("yellow",150)),...

    Started by Remi‎, 10-23-2016 07:58 PM
    categorical vairable, hypothesis testing, logistic regression, mcmcglmm
    • Replies: 0
    • Views: 222
    10-23-2016, 07:58 PM Go to last post

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