sjstats (version 0.7.1)

chisq_gof: Chi-square goodness-of-fit-test

Description

This method performs a Chi-square goodness-of-fit-test (GOF) either on a numeric vector against probabilities, or a Goodness-of-fit test for glm-objects for binary data.

Usage

chisq_gof(x, prob = NULL, weights = NULL)

Arguments

x

Numeric vector, or a glm-object.

prob

Vector of probabilities (indicating the population probabilities) of the same length as x's amount of categories / factor levels. Use nrow(table(x)) to determine the amount of necessary values for prob. Only used, when x is a vector, and not a glm-object.

weights

Vector with weights, used to weight x.

Value

For vectors, returns the object of the computed chisq.test.For glm-objects, an object of class chisq_gof with following values:

• p.value the p-value for the goodness-of-fit test
• z.score the standardized z-score for the goodness-of-fit test
• RSS the residual sums of squares term
• X2 the pearson chi-squared statistic

Examples

data(efc)
# differing from population
chisq_gof(efc$e42dep, c(0.3,0.2,0.22,0.28))
# equal to population
chisq_gof(efc$e42dep, prop.table(table(efc$e42dep)))

# goodness-of-fit test for logistic regression
efc$services <- ifelse(efc$tot_sc_e > 0, 1, 0)
fit <- glm(services ~ neg_c_7 + c161sex + e42dep, data = efc,
           family = binomial(link = "logit"))
chisq_gof(fit)