logistic regression

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    Logistic Regression -some expert advice !

    Hi guys I've recently worked on a project involving Logistic Regression. Although I've managed to 'complete' the project, I'm unsure whether what I have done so far is correct and/or sufficient. It is a case of regular binary logistic regression. One dichotomous response variable and several...
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    How do I use non-linear continuous variables in a logistic regression?

    Hey guys. I need a little help understanding how to use continuous variables in a logistic regression. Specifically, what if my continuous variable is non-linear? Take a look at this blog post...
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    Logistic regression with predictor variables with both categorical & actual values

    I've got a data set with 40 variables with 30 variables each having certain observations that are coded (i.e. have values) from 1-6 describing certain situations and some values that provide real values for what each of those variables represent as well. i.e. the variables are partially...
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    Another, more difficult Cox Regression/Hazard Ratio interpretation question

    So, for an assignment, we were given this data taken from the Stanford Heart Study from 1978 or so: I used equal signs because I thought dashes might be confusing. They haven no mathematical function in the following 'tables' The variables in question are: Age in years in reference to age 48...
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    'Significant' product-term interaction but no significant simple main effect contrast

    :wave: I'm conducting a conditional logistic regression to assess the association between a continuous predictor and a dichotomous outcome, adjusted for several covariates. I include product interaction terms between an exposure and a covariate in each of several models. In a few of these I...
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    Different p-values with different procedures

    Fairly novice in statistics, so this will surely have a simple explanation. I ran bivariate analyses to check for normality of a series of variables and also to test the relationship of each with two outcome variables (one binary the other continuous). In the bivariate analyses (using either...
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    Interpreting d reference category of logistic regression SPSS & other output results

    Hi there, could you kindly help me to understand what my reference category and regression equation resulsts are saying. I have run a multivariate logistic regression in SPSS v21 to examine the contributory effects of independent risk variables (IRV) (occupation, migration to rural...
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    Binary logistic regression with multiple imputed data: how to get pooled estimates?

    Dear all, I have performed multiple imputation on my dataset using SPSS 20, giving me 10 different datasets. I have understood that you could easily perform logistic regression on these and that you would get the pooled estimates (saw some examples of this as well, but only with the enter...
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    [Statistica] logistic regression

    Hi, I have been getting a bunch of errors with Statistica when trying to created a logistic regression model. I use the Generalized Linear/Non-linear tab then go to logit model. The problem I have is that after I load up my variables and try to make a forward stepwise model I get an...
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    Generalized mixed model question

    I have version 21 of spss with advance statistics. I was trying to use the generalized mixed model function, but it's not showing up in my options. I called IBM who agreed I have the correct license to enable this function, but they could not tell me why it's not showing up in my software. Does...
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    A regression problem with optional treatment

    I have an interesting problem here and really need your suggestion to analyze the data in a proper way. In 2012 we collected data about retention of the students from first semester to second semester along with some other variables. The retention variable is a binary type variable-...
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    Anything but Multinomial Logistic Regression

    We have 5 mutation sites we are studing in 200 insect species. There are only 20 different mutation combinations among the 5 sites. Each mutation site has only two (only one has three) possible amino acid values. We also have 4 categorical variables that are environmental (geography...
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    cumulative odds ratios - additive or exponential?

    I have run some regression models that examine the effect of variable X (a 15 point continuous scale) on Y (a binary variable - didn't perform/did perform a particular behaviour) using logistic regression. For the sake of this example, let’s say that the OR is 1.08. I can argue that for each...
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    Aggregating or Pooling Multinomial Logistic Regression Coefficients

    I'm trying to recreate the MNL analysis like this paper or this one. In Excel I have a sheet with my choice column which contains the market share on each itinerary. Alternatively I also have the number of passengers on that itinerary that could be used instead as the choice variable. I then...
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    Logistic regression probabilities

    Hi I have built a logistic regression model that predicts the response probability from a marketing campaign. The model ranks correctly (i.e. the lower scored customers take up the offer less often than higher scored customers), but the probabilities predicted by the model are never the same...
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    bootstrapping and predictive logistic model

    Hello members. I don't have experience with programming in Stata, then, please, I need help with this: I am developing a predictive logistic model. The regression coefficients were selected using the stepwise method: . xi: sw, lr pe(.05 ) pr(.051) lockterm1: logistic depvar (var1...
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    Logistic regression with interactions

    Hi, I've asked this question already on another forum, but nobody has been able to answer, so I try it here. Because of my inexperience with formatting in this environment instead of posting it here, I simply provide you with a link...
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    logistic regression predicted values and confidence interval

    Hello I have run a logistic regression with two independent variables. I have used transformed my y(sales) and my x1(population) and x2(water). I have my output in excel and i'm fine with the model. What I need help with is the equation for predicting values and for getting a range of...
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    Logistic Regression: interpreting an interaction term

    Dear Forum, This topic has been covered a lot here and in other forums, but I have yet to find a clear answer to this particular problem. I'm trying to understand how to interpret the odds ratio of an interaction between a categorical variable with 6 levels (6 similar products) and a...
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    Logisti regression, mean or median of independent variable.

    Greetings great minded statisticians! I have an issue categorizing my continuous variable. I have put a continuous variable with a negative skew, into three categories. I am using logistic regression and I want to see if my three variables of omega-3 fatty acids will reduce the risk of being...