Question : An analyst investigates Region (A, B, or C) as an input variable in a logistic regression model. The analyst discovers that the probability of purchasing a certain item when Region = A is 1. What problem does this illustrate? 1. Collinearity 2. Influential observations 3. Quasi-complete separation 4. Problems that arise due to missing values
Question : Refer to the following exhibit: What is a correct interpretation of this graph?
1. The association between the continuous predictor and the binary response is quadratic. 2. The association between the continuous predictor and the log-odds is quadratic. 3. Access Mostly Uused Products by 50000+ Subscribers 4. The association between the binary predictor and the log-odds is quadratic.
Correct Answer : Get Lastest Questions and Answer : When a binary outcome variable is modeled using logistic regression, it is assumed that the logit transformation of the outcome variable has a linear relationship with the predictor variables. This makes the interpretation of the regression coefficients somewhat tricky.
Here above association between continuous predictor and the log-odds is quadratic. Y' = a + b1X1 + b2X12 Quadratic
Question : This question will ask you to provide a missing option. Given the following SAS program: What option must be added to the program to obtain a data set containing Pearson statistics? 1. OUTPUT=estimates 2. OUTP=estimates 3. Access Mostly Uused Products by 50000+ Subscribers 4. OUTCORR=estimates
Correct Answer : Get Lastest Questions and Answer : PROC CORR (options> ; Data Sets DATA= Specifies the input data set OUTH= Specifies the output data set with Hoeffding's statistics OUTK= Specifies the output data set with Kendall correlation statistics OUTP= Specifies the output data set with Pearson correlation statistics OUTS= Specifies the output data set with Spearman correlation statistics Statistical Analysis EXCLNPWGT Excludes observations with nonpositive weight values from the analysis FISHER Requests correlation statistics using Fisher's transformation HOEFFDING Requests Hoeffding's measure of dependence, KENDALL Requests Kendall's tau-b NOMISS Excludes observations with missing analysis values from the analysis PEARSON Requests Pearson product-moment correlation SPEARMAN Requests Spearman rank-order correlation Pearson Correlation Statistics ALPHA Computes Cronbach's coefficient alpha COV Computes covariances CSSCP Computes corrected sums of squares and crossproducts FISHER Computes correlation statistics based on Fisher's transformation SINGULAR= Specifies the singularity criterion SSCP Computes sums of squares and crossproducts VARDEF= Specifies the divisor for variance calculations OUTP=output-data-set OUT=output-data-set creates an output data set containing Pearson correlation statistics. This data set also includes means, standard deviations, and the number of observations. The value of the _TYPE_ variable is 'CORR.' When you specify the OUTP= option, the Pearson correlations will also be displayed. If you specify the ALPHA option, the output data set also contains six observations with Cronbach's coefficient alpha.