Summarise calendar-development statistics (Mean, Median, Weighted)

S3 method for summary() on Calendar objects. Computes calendar-period summary statistics for loss ratios (lr) and cumulative loss ratios (clr).

Where summary.Triangle() aggregates by (group_var, dev) (cohort × development), this method aggregates by (group_var, calendar) (calendar period) so the resulting table is indexed by calendar diagonals rather than development periods.

Usage

# S3 method for class 'Calendar'
summary(object, ...)

Arguments

object: An object of class Calendar.
...: Unused; included for S3 compatibility.

Value

A data.table of class "CalendarSummary" with one row per (group_var, calendar) combination, containing:

n_obs: Number of observations in the cell.
lr_mean: Mean of loss ratios.
lr_median: Median of loss ratios.
lr_wt: Weighted loss ratio (sum(loss) / sum(rp)).
clr_mean: Mean of cumulative loss ratios.
clr_median: Median of cumulative loss ratios.
clr_wt: Weighted cumulative loss ratio (sum(closs) / sum(crp)).

The returned object preserves the attributes group_var, calendar_var, and calendar_type.

Examples

if (FALSE) { # \dontrun{
cal <- build_calendar(df, group_var = cv_nm)
sm  <- summary(cal)
head(sm)
} # }