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1. [[FAQ/normN|How many observations do I need to make z-scoring (assuming Normality) feasible?]] 1. [[FAQ/stables | Are there any on-line statistical tables for commonly used distributions?]] 1. [[FAQ/Sattherthwaite|Why are the degrees of freedom not whole numbers?]] 1. [[FAQ/ztcF|What is the relationship between the z, t, chi-square and F distributions?]] 1. [[attachment:asymmetry.pdf|A Normalising transformation of ratios of form (L-R)/(L+R)]] 1. [[FAQ/Combinatorics|What is the probability of a repetition in a sequence of size k taken from K stimuli?]] 1. [[FAQ/multi|How do I evaluate Multinomial probabilities of pooled trial frequencies of locations of peaks which can occur in one of K positions in each trial?]] 1. [[FAQ/wblfit|How do I fit a Weibull distribution to scores over time using MATLAB and notes on using non-linear least squares?]] 1. [[FAQ/recode|How do I recode levels of a group variable in SPSS?]] |
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1. [[FAQ/FVars| What is the variance of the mean of my transformed data and the variance of combinations of means?]] | 1. [[FAQ/FVars| What is the variance of the mean of my transformed data and the variance of combinations of means?]] 1. [[FAQ/wttest| How do I do a t-test between two weighted means?]] |
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1. [[FAQ/thirds|What is an optimal cut-off for the discretization of a continuous variable and how do we use this in a regression?]] | 1. [[FAQ/thirds|What is an optimal cut-off for the discretization/splitting of a continuous variable and how do we use this in a regression?]] |
Questions about distributions of random variables
How many observations do I need to make z-scoring (assuming Normality) feasible?
Are there any on-line statistical tables for commonly used distributions?
What is the relationship between the z, t, chi-square and F distributions?
What is the probability of a repetition in a sequence of size k taken from K stimuli?
A note on comparing confidence intervals and statistical significance
What is the variance of the mean of my transformed data and the variance of combinations of means?
A quick approximation for Normally distributed expected order statistics
How do I derive an expected total for a subset of items based on the expected overall total?
How do I check Normality assumptions in repeated measures analyses in SPSS?
Testing normality including rules of thumb for skew, kurtosis in SPSS
How do I produce truncated exponential random variables using MATLAB?
How do I obtain parameter estimates for finite Normal mixture distributions using SPSS and BMDP?
How do I find out how many people have a score above a certain value?
How do I compute percentile thresholds for exponential data and use in outlier detection?
How do I obtain the mean of several variables, each minus the same constant? (In SPSS)
How do I compute z-scores in SPSS and what is their relationship to comparing group means?
How do I use cumulative distribution functions to compute p-values in SPSS, EXCEL and R?
How do I adjust for age in comparing survival times in two different groups?
What is the relationship between intercept and slope for scores at two time points?
How do I produce random variables which follow a negative skew distribution?
How do I calculate probabilities involving the multivariate normal distribution?
Simulations sampling from data with replacement (bootstrapping)
Generating multivariate data with a required correlation matrix
How do I obtain the formulae behind statistics outputted by SPSS algorithms?