fin_value_percent: Compute the percent change needed to return to the original...

In umx: Structural Equation Modeling and Twin Modeling in R

Compute the percent change needed to return to the original value after percent off (or on).

Description

Determine the percent change needed to "undo" an initial percent change. Has a plot function as well. If an amount of $100 has 20% added, what percent do we need to drop it by to return to the original value?

fin_value_percent(20) yields $100 increased by 20% = $120 (Percent to reverse = -17%)

Usage

fin_value_percent(
  percent,
  value = 100,
  symbol = "$",
  digits = 2,
  plot = TRUE,
  logY = TRUE
)

Arguments

percent	Change in percent (enter 10 for 10%, not 0.1)
value	Principal
symbol	value units (default = "$")
digits	Rounding of results (default 2 places)
plot	Whether to plot the result (default TRUE)
logY	Whether to plot y axis as log (TRUE)

Value

• new value and change required to return to baseline.

See Also

• fin_value_interest()

Other financial functions: fin_options_Greeks(), fin_options_LeapSimulate(), fin_options_plotGreeks(), fin_options_teach(), fin_stock_CAGR(), fin_stock_justifiedPE(), fin_stock_target(), fin_stock_ticker(), fin_stock_valuation(), fin_tax_FIF(), fin_tax_NI(), fin_value_CAGR(), fin_value_CarryCost(), fin_value_NPV(), fin_value_interest()

Examples

# Percent needed to return to original value after 10% taken off
fin_value_percent(-10)
# Percent needed to return to original value after 10% added on
fin_value_percent(10)
# Percent needed to return to original value after 50% off 34.50
fin_value_percent(-50, value = 34.5)

umx documentation built on Oct. 11, 2026, 5:07 p.m.