Describe numeric variables by several measures of central tendency and variability. If no variables are specified, all numeric (integer or double) variables are described.
describe(data, ..., na.rm = TRUE)
a tdcmm model
N: number of valid cases (i.e., all but missing)
Missing: number of NA cases
M: mean average
SD: standard deviation, sd
Min: minimum value, min
Q25: 25% quantile, quantile
Mdn: median average, same as 50% quantile
Q75: 75% quantile, quantile
Max: maximum value, max
Range: difference between Min and Max
CI_95_LL: \(M - Q(0.975) \times \frac{SD}{\sqrt{N}}\) where \(Q(0.975)\) denotes Student t's stats::quantile function with a probability of \(0.975\) and \(N-1\) degrees of freedom
CI_95_UL: \(M + Q(0.975) \times \frac{SD}{\sqrt{N}}\) where \(Q(0.975)\) denotes Student t's stats::quantile function with a probability of \(0.975\) and \(N-1\) degrees of freedom
Skewness: traditional Fisher-Pearson coefficient of skewness of valid cases as per \(\frac{\frac{1}{N} \sum\limits_{i=1}^N (x_{i}-\overline{x})^3}{[\frac{1}{N}\sum\limits_{i=1}^N (x_{i}-\overline{x})^2]^{3/2}}\) where \(\overline{x}\) denotes \(M\), following Doane & Seward, 2011, p. 6, 1a
Kurtosis: empirical sample kurtosis (i.e., standardized fourth population moment about the mean) as per \(\frac{\sum (x-\overline{x})^4 / N}{(\sum (x-\overline{x})^2 / N)^2}\), following DeCarlo, 1997, p. 292, b2
Other descriptives:
describe_cat()
,
tab_percentiles()
WoJ %>% describe(autonomy_selection, autonomy_emphasis, work_experience)
#> # A tibble: 3 × 15
#> Variable N Missing M SD Min Q25 Mdn Q75 Max Range
#> * <chr> <int> <int> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl>
#> 1 autonomy_selec… 1197 3 3.88 0.803 1 4 4 4 5 4
#> 2 autonomy_empha… 1195 5 4.08 0.793 1 4 4 5 5 4
#> 3 work_experience 1187 13 17.8 10.9 1 8 17 25 53 52
#> # ℹ 4 more variables: CI_95_LL <dbl>, CI_95_UL <dbl>, Skewness <dbl>,
#> # Kurtosis <dbl>
fbposts %>% describe(n_pictures)
#> # A tibble: 1 × 15
#> Variable N Missing M SD Min Q25 Mdn Q75 Max Range
#> * <chr> <int> <int> <dbl> <dbl> <int> <dbl> <dbl> <dbl> <int> <int>
#> 1 n_pictures 270 0 0.952 1.47 0 0 1 1 12 12
#> # ℹ 4 more variables: CI_95_LL <dbl>, CI_95_UL <dbl>, Skewness <dbl>,
#> # Kurtosis <dbl>