check_formula {LDATS}

Check that a formula is proper

Description

Check that formula is actually a formula and that the response and predictor variables are all included in data.

Usage

check_formula(data, formula)

Arguments

data

data.frame including [1] the time variable (indicated in timename), [2] the predictor variables (required by formula) and [3], the multinomial response variable (indicated in formula) as verified by check_timename and check_formula. Note that the response variables should be formatted as a data.frame object named as indicated by the response entry in the control list, such as gamma for a standard TS analysis on LDA output.

formula

formula to evaluate.

Value

An error message is thrown if formula is not proper, else NULL.

Examples

  data(rodents)
  document_term_table <- rodents$document_term_table
  document_covariate_table <- rodents$document_covariate_table
  LDA_models <- LDA_set(document_term_table, topics = 2)[[1]]
  data <- document_covariate_table
  data$gamma <- LDA_models@gamma
  check_formula(data, gamma ~ 1)