Convert Data from Wide to Long Format Using reshape

Description

This utility function takes a simulated data.frame in wide format as an input and converts it into a long format (slower compared to DF.to.longDT).

Usage

1
DF.to.long(df_wide)

Arguments

df_wide

A data.frame in wide format

Details

Keeps all covariates that appear only once and at the first time-point constant (carry-forward).

All covariates that appear fewer than range(t) times are imputed with NA for missing time-points.

Observations with all NA's for all time-varying covariates are removed.

When removing NA's the time-varying covariates that are attributes (attnames) are not considered.

Value

A data.frame object in long format

See Also

DF.to.longDT - a faster version of DF.to.long that uses data.table package

Other data.manipulation.functions: DF.to.longDT, doLTCF

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