Statistical FAQs
Can I...
- ...perform <some_statistic_or_method>?
- ...perform a Gage Repeatability and Reliability (Gage R&R) analysis?
- ...perform a multinomial logit analysis in JMP?
- ...perform a one-way analysis of variance with only summary data in JMP Software?
- ...get Cronbach's coefficient alpha from JMP?
- ...get discriminant function scores or function coefficients?
- ...get a Receiver Operating Characteristic (ROC) curve in JMP?
- ...get the process capability index CPK?
- ...get Fisher's Exact test?
- ...get a pdf plot?
- ...get the kurtosis and skewness?
- ...get Geisser-Greenhouse and Huynth-Feldt adjusted F-tests?
- ...get the medians for BY-groups?
- ...get the Mann-Whitney U Test in JMP?
- ...get standardized regression coefficients?
- ...calculate a geometric mean?
- ...test if my data are coming from the "XYZ" distribution?
- ...test for equal variances in my groups?
- ...generate multivariate normal data within JMP?
How do I...
- ...perform a paired t-test?
- ...replicate the runs of a design?
- ...interpret the saved spline coefficients table?
- ...interpret the odds ratios given from JMP?
- ...get an analysis using CODED or UNCODED effects?
- ...rank a column in my data table?
- ...standardize a column in my data table?
- ...distinguish the different survival curves in JMP's Kaplan-Meier Survival Plot when printing on a black and white printer?
- ...get Squared Partial Correlation Coefficients and/or Squared Semi-partial Correlation Coefficients in JMP?
- ...interpret the Shapiro-Wilk test for normality?
- ...change the level of the event that is modeled in JMP's logistic regression?
- ...test the difference in slope of several lines?
- ...determine when to stop splitting my tree to avoid overfitting?
- ...change the number of decimals displayed for the UCL, Average, and LCL in my control charts?
- ...create a two-way or multi-way ANOVA?
- ...create a design with a continuous factor that has more than 2 levels?
How is/are...
- ...the confidence limits calculated for the linearity study?
- ...control limits calculated for the different Shewhart control charts?
- ...the standard deviation calculated for different Shewhart control charts?
- ...control limits calculated for the different moving average control charts?
- ...the standard deviation calculated for the different moving average control charts?
- ...the crossvalidation statistics defined in Partition?
- ...excluded rows handled by individual measurements and moving range control charts?
Other
- I have nominal and ordinal variables, and I don't understand how JMP is performing the stepwise regression analysis. Is there any information on this?
- If I change my columns from ordinal to nominal or vice versa, my parameter estimates do not match. Why?
- My Nonlinear model isn't converging. Why?
- Why does my output from JMP differ from that of PROC GLM's output?
- Why does JMP use the default option center polynomials and how does this compare with PROC GLM?
- When I run my model through the Fit Model platform, I get "LostDFs" notes in the Effect Test, and "Biased" and "Zeroed" parameter estimates. What is causing these messages?
- I am fitting a model with random effects. When I look at the "Test denominator synthesis" output, some effects are not being tested as I think they should. Is JMP calculating these tests incorrectly?
- When I run nominal or ordinal logistic regression in JMP, I receive parameter estimates labelled as "Unstable". What is causing these messages?
- When doing a Screening analysis via Fit Model, what are the "Orthog Coded" and "Orthog t-Test" columns displayed by Effect Screening from the checkmark menu? How are they used? How are they computed?
- What is the Specified Sigma option in capability analysis and how is the default value calculated?
- Why does JMP’s Brown-Forsythe test for homogeneity of variance differ from hand calculations, or other products’ results?
- How does JMP pick the initial cluster seeds in K-Means Clustering?
- When calculating power and sample size, what value should be placed in the error std deviation box?
- What value should I enter for Baseline Proportion in the Two Sample Proportions power and sample size window?
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