0
votes
2answers
29 views

Dealing with Categorical variables in Multiple Regression

I have a data having 2 continuous and 4 categorical variables. Each categorical variable has 3 levels. I want to know how to include the variables in the model. I am using SPSS Variables: Sales - ...
-3
votes
0answers
22 views

binary logistic regression in spss version 22

I'm trying to run a Binary Logistic Regression. I have multiple IVs and 1 Binary DV. Can anyone show me how to do this with SPSS v.22? (or which one to select from this list) thank you
1
vote
1answer
44 views

Binary or Multinomial Logistic Regression in SPSS: Interpretation and Reference Categories

I am trying to analyze my data using Multinomial Logistic Regression whereby my dependent variable is a clinical outcome (sick vs healthy) and 1 independent variables (Factors) are in several ...
0
votes
0answers
26 views

Compare regression coefficients within one sample

I run two univariate linear regressions within one sample (same subjects, two different conditions). Now I would like to know how to compare the regression coefficients in order to find out whether ...
0
votes
0answers
11 views

How to get odds ratio when combining multiple tests in logistic regression in spss?

we get odds ratio in logistic regression for predictive accuracy of a test. how do we get one odds ratio from combining more than 1 test in predicting outcome? how do we enter the data to get this in ...
4
votes
1answer
50 views

Principal component regression analysis using SPSS

I have done multiple regression analysis (MLR) of my data and find out $R^2$ and $r$, and then to remove multicollinearity problem I used PCA. This analysis generated PC equal to my variables, I ...
0
votes
1answer
60 views

Leave-one-out cross validation

I am working about elaborate a simple linear regression so I need to evaluate many models. I am asking how I can use leave-one-out cross validation to validate a simple linear regression.
4
votes
1answer
28 views

Predicting variance of heteroscedastic data

I am trying to do a regression on heteroscedastic data where I'm trying to predict the error variances as well as the mean values in terms of a linear model. Something like this: $$\begin{align}\\ ...
1
vote
0answers
19 views

Assessing Cannibalization, intervention of new mobile app on monthly sales

I am a beginner in statistics and looking for suggestions from you all on the approach for one of my study. For my study, there is a company which sells products via its online website (lets call it ...
0
votes
1answer
86 views

Dummy variables in linear regression

I used SPSS to create dummy variables for three different shops. Shop 1 was coded 0, shop 2 was coded 1 and shop 3 was coded 2. In my output I see that the slope coefficients (B) for shop 2 and 3 are ...
1
vote
1answer
52 views

Should I analyze variables separately or together?

I have one categorical variable (on a diet: yes or no) and two numerical variables (patients heart rate and ...
1
vote
1answer
51 views

Book on interpreting plots in regression analysis

I am taking a regression course that is mainly theoretical. But we are given scatter plots and residual plots, and we are supposed to be able to describe the relationships and interpret them. I find ...
1
vote
0answers
28 views

Comparing the difference in change in repeated measures ordinal variables between two groups

I have two groups of patients, those with (OSA) and those without (nOSA) sleep apnoea. Patients were scheduled to undergo a surgical procedure (Sx). Each patient completed a type of quality of life ...
1
vote
2answers
52 views

.999 signifiance query

I am getting the following result for one of my variables after running a logistic regression. Basically I have a set of binary dependent and one independent variable. One of the dependent ...
0
votes
0answers
63 views

Ordinal Independent Variables and Dependent Variable Regression Analysis

I have 3 variables (2 are independent and 1 is dependent). All three variables are measured with questionnaires consisting of multiple questions recorded on 5 point scale. I want to perform regression ...
0
votes
0answers
27 views

Empty significance in SPSS linear regression

I got a weird result with linear regression: there are empty significances. I use 'Stepwise' method, so it should drop the inadequate variables. (Of course the "000" Betas are confusing too.) What ...
2
votes
0answers
35 views

How to test for mediation with a continuous mediator and DV, but a categorical predictor?

I want to explore whether attitudes mediate the relationship between employment status and intention to apply to graduate school. (See image below). I planned to use the Sobel Test to explore the ...
2
votes
1answer
109 views

Building a time series model using more than independent variables

I am working on a project, and I am totally new to statistics. I have sales data for last two years at week level, along with other variables like temperature, holiday (TRUE/FALSE), where holiday are ...
2
votes
3answers
369 views

How can I improve the predictive power of this logistic regression model?

I am using SPSS to analyze a data set which aims to predict whether individuals have cancer based on five symptoms (a, b, c, d, e). In this data set most individuals have cancer. I ran a Binary ...
2
votes
1answer
64 views

SPSS linear regression - variables that are percentages

I have some data about music styles played at festivals. It looks like this: Based on this (and other) data, I'd like to make a model to explain the price of a ticket for each festival. However I'm ...
4
votes
1answer
123 views

Statistical significance for comparison of linear regression models

I have two linear regression models (with the same predictors) that try to estimate two different (although related) features of the same population. I am analyzing the hypothesis that these ...
0
votes
0answers
15 views

Should I include multiple mediating variables in the same analysis?

If the answer is "it depends", what does it depend on? I have three mediating variables, one predictor variable and one outcome variable. I have observed that the results I get when I run three ...
1
vote
0answers
62 views

Discontinuity Regression

I'm writing a political economy Master's thesis regarding the effects of the Euro Crisis on the rise of separatism in Spain (Catalan independence for example). The idea is to show that the Crisis has ...
0
votes
1answer
153 views

How can I compare regression coefficients in the same multiple regression model

I think this question has been answered in bits and pieces here and there, but I am still a bit unsure about what the best approach for this is: how to compare two coefficients from a multiple linear ...
1
vote
0answers
64 views

Questionnaire analysis and grouping responses

I want to know if the creative process engagement (CPE) is related to creativity. I don't know how to analyze the questionnaire. I will be collecting data for CPE with Zhang and Bartal's (2010) ...
0
votes
1answer
68 views

Best way to estimate a regression with reaction times

I have reactions times in a no-normal distribution, so I am using logarithms. Which can be the best way to estimate a regression? Later, I would like to plot the results according to the age of my ...
1
vote
0answers
54 views

Running standardized/unstandardized regression equation on SPSS

I am working on a regression assignment using SPSS. I have raw, centered, and z scores for the data. I already regressed the DV and IV and see the unstandardized and standardized coefficients under ...
1
vote
1answer
120 views

Regression with multiple dependent variables and 2 sets of multiple independent variables

In my data I want to be able to determine which set of IVs (there are 8 variables total, 4 in each set) does a better job of predicting a set a DVs (there are 4). I know I could use multivariate ...
0
votes
1answer
412 views

Marketing Mix Modeling for sales data

I have data for 4 years with variables year, month and sales volume only. I want to find the base volume and incremental volume. I want to use Marketing Mix Modeling. Can anybody tell how to define ...
0
votes
0answers
142 views

Logistic regression model internal validation in SPSS

Please help! I have developed a logistic regression model for prediction of a binary outcome at a range of different times following a set point. This gave me different models with different ...
0
votes
0answers
29 views

spss covariates variables in regression model

in the regression model in the spss statistic software can you explain me what are the covariates variables? if i want express a model like ...
-1
votes
1answer
546 views

Linear/Non-linear Regression - SPSS

Hopefully somebody will be able to shed some light on my SPSS problems! I have been given 65 values. 57 of these data values are quarterly results and 8 are the holdback data to be used. I have to ...
1
vote
2answers
106 views

SPSS Batch Processing Method

I have a more than 150 list of products that will be analyzed by regression method based on years. For example: products: A,B,C ... N (150th products) Then ...
1
vote
0answers
45 views

Multinomial regression analyses

My dependent variable is categorical (with 3 levels) and my predictor variables are a mix of continuous (age in months, test 1 score, test 2 score, test 3 score) and categorical (gender). I believe I ...
1
vote
1answer
111 views

Inverted SPSS results: Logistic regression command vs. Genlin?

I want to do a logistic regression in SPSS. However, since I analyse unemployment spells the subjects are sometimes repeated (violating the independence assumption of the regression). One way of ...
4
votes
3answers
236 views

Pooling regression results in SPSS

I have to solve the following issue: I run my linear regression model many times (let's say 1000 times) with two variables: y - continuous dependent variable, x - continuous independent variable ...
0
votes
0answers
75 views

Transformations used in Automatic Linear Modeling procedure in SPSS

I am using Automatic Linear Modeling in SPSS. Does anyone here know what are the transformations option which is suggested in that procedure?
3
votes
1answer
2k views

Is it acceptable to use linear regression to predict a 4 point likert scale from a 7 point likert scale?

My dependent variable is measured on a 4 point likert scale and independent variable is measured on a 7 point likert scale. Is it appropriate to run regression analysis on such data with varying ...
0
votes
1answer
288 views

What to do when linearity is violated in a linear regression analysis SPSS

I am currently trying to undertake a linear regression analysis in SPSS and I have come across some difficulties. My data does not show linearity and therefore is violated. I have transformed both ...
1
vote
1answer
55 views

How do I check for covariates and how do I adjust for them?

My data: My outcome variable (Outvar) is binary (yes/no) My explanatory variable (exvar) is also binary (yes/no) I have 3 extra variables: Variable A is binary Variable B is continuous but not ...
0
votes
0answers
47 views

Advanced regression in SPSS

I have data of several school classes (with several pupils). I want to calculate expected/predicted values of class A for some items using a regression (a multiple linear regression in that special ...
3
votes
2answers
713 views

Is it possible to conduct a regression if all variables are ordinal?

I would like to produce a regression analysis model. I have ordinal categorical data. I can use SPSS. I do not know what analysis to perform or what assumptions to check. What are the statistical ...
1
vote
1answer
36 views

Compare mean effect of one predictor based on another predictor

I would like to compare the effect of one IV ("sensation seeking") on a DV ("intended infidelity") based on another IV ("gender"). Actually I really just want to compare the means. So I would like to ...
0
votes
0answers
302 views

How to deal with a non-significant threshold value in ordinal regression in SPSS?

I am running an ordinal regression in SPSS. I have independent variables on nominal and ordinal scales. My dependent variable is ordinal, indicating a level of action, coded 0, 1, 2. Unfortunately, I ...
1
vote
1answer
841 views

Multiple variable comparison line graph SPSS

I have 6 variables, three of which are median splits and three of which are continuous measures of 'such and such', each of which is measured on the same 5 point scale. I am trying to produce a graph ...
0
votes
0answers
97 views

How to fit a multiple regression model that takes into account 50 days of each individual's history

I am using simple linear regression to predict the number of days of school a single student might miss after 250 days using their cumulative daily attendance data over the first 50 days of the ...
0
votes
1answer
175 views

Compare the slopes and intercepts between 2 variables in SPSS

There are 4 groups, each one having two 2 variables, X and Y. I am trying to understand the regression between them. For X variable I have 2 categories, positive and negative. I am not understanding ...
2
votes
1answer
102 views

Adding variables to the model one by one, or at the same time

What are the benefits of adding the variables into a model one by one, as compared to adding them all at the same time? As I see in most research, the first model that is tested is consisted of all ...
1
vote
1answer
201 views

Comparing two slopes

I have a dataset structured as follows: ...
0
votes
0answers
85 views

Goodness of fit vs. significance

If you had two models - one with a better fit, and one with predictors of higher significance - which one would you choose? Keep in mind that both models are considered a good fit. One has a 3% ...