roll_fit_predict_seq: Rolling fit/predict for sequence models (flattened steps-by-p...

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Rolling fit/predict for sequence models (flattened steps-by-p features)

Description

Rolling fit/predict for sequence models (flattened steps-by-p features)

Usage

roll_fit_predict_seq(
  features_list,
  labels,
  steps = 26L,
  horizon = 4L,
  fit_fn,
  predict_fn,
  is_periods = 156L,
  oos_periods = 4L,
  step = 4L,
  group = c("pooled", "per_symbol", "per_group"),
  group_map = NULL,
  normalize = c("none", "zscore", "minmax"),
  min_train_samples = 50L,
  na_action = c("omit", "zero")
)

Arguments

features_list	list of panels to be stacked over steps history.
labels	future-return panel aligned to the features.
steps	int; lookback length (e.g., 26).
horizon	int; label horizon (e.g., 4).
fit_fn	function ⁠(X, y) -> model⁠ trained on in-sample stacked rows.
predict_fn	function ⁠(model, Xnew) -> numeric⁠ scores.
is_periods, oos_periods, step	ints; in-sample length, out-of-sample length, and step size for the rolling window.
group	one of "pooled", "per_symbol", "per_group".
group_map	optional data.frame(Symbol, Group) if group = "per_group".
normalize	"none", "zscore", or "minmax" applied using IS data only.
min_train_samples	Optional minimum IS samples required to fit; if not met, skip fit.
na_action	"omit" or "zero" for feature NA handling.

Value

wide panel of scores.

Examples

data(sample_prices_weekly); data(sample_prices_daily)
mom <- panel_lag(calc_momentum(sample_prices_weekly, 12), 1)
vol <- panel_lag(align_to_timeframe(
  calc_rolling_volatility(sample_prices_daily, 20),
  sample_prices_weekly$Date, "forward_fill"), 1)
Y <- make_labels(sample_prices_weekly, horizon = 4, type = "log")
fit_lm  <- function(X,y){ Xc <- cbind(1,X); list(coef=stats::lm.fit(Xc,y)$coefficients) }
pred_lm <- function(m,X){ as.numeric(cbind(1,X) %*% m$coef) }
S <- roll_fit_predict_seq(list(mom=mom, vol=vol), Y,
                          steps = 26, horizon = 4,
                          fit_fn = fit_lm, predict_fn = pred_lm,
                          is_periods = 104, oos_periods = 4, step = 4)
head(S)

PortfolioTesteR documentation built on Nov. 5, 2025, 5:23 p.m.