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Interest Rate

The percentage of the value of a balance or debt that one pays or is paid each time period. For example, if one holds a bond with a face value of $1,000 and a 3% interest rate payable each quarter, one receives $30 each quarter. The percentage of the interest rate remains constant (usually), but the amount one pays or is paid changes according to the amount of the balance or debt. For example, if one pays off part of the principal on a loan each month, the amount one pays in interest decreases even though the rate remains the same. See also: Time Value of Money.
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References in periodicals archive ?
Intrinsic rate of increase (r) increased with increasing temperature; from 0.1543, 0.1600 and 0.1518 females per female per day at 24 +- 0.5 AdegC, 27 +- 0.5 AdegC but declined at 32 +- 4 AdegC.
These results showed that the intrinsic rate of increase (r) of L.
The main parameter of the life table is represented by the intrinsic rate of population increase ([r.sub.m]), which is defined as the innate increase capacity of a population under ideal conditions; in other words, it corresponds to the population biotic potential (Price, 1984; Pedigo and Zeiss, 1996).
Treatment Population growth parameter (a,b) T [R.sub.o] YieldGard VT 41.96 [+ or -] 0.17 a 621.16 [+ or -] 44.33 b PRO[TM] PowerCore[TM] 41.60 [+ or -] 0.15 a 490.30 [+ or -] 56.50 c Non-Bt corn 39.98 [+ or -] 0.22 b 854.16 [+ or -] 58.46 a Treatment Population growth parameter (a,b) [r.sub.m] [lambda] YieldGard VT 0.153 [+ or -] 0.003 b 1.17 [+ or -] 0.002 b PRO[TM] PowerCore[TM] 0.146 [+ or -] 0.003 c 1.16 [+ or -] 0.003 c Non-Bt corn 0.169 [+ or -] 0.002 a 1.18 [+ or -] 0.002 a (a) T = mean generation time (days); [R.sub.o] = net reproductive rate (females per female per generation); [r.sub.m] = intrinsic rate of population increase (per day) and [lambda] = finite rate of population increase (per day).
Parameters Results Net reproductive rate ([R.sub.o]) 223.64 [female]/[female] Mean generation period (T) 36.50 d Intrinsic rate of natural increase ([r.sub.m]) 0.145 [female]/[female]/d Doubling time ([D.sub.T]) 4.78 d
The results of statistical analysis revealed significant differences in sublethal effects of the synthetic and botanical insecticides on the net reproductive rate (F = 8.271; df = 6, 37; P < 0.001), the intrinsic rate of increase (F = 8.619; df = 6,37; P < 0.001), and the finite rate of increase (F = 8.688; df = 6, 37; P < 0.001).
Under the assumption of zero fishing mortality, the conditional intrinsic rate of increase parameter, r, was estimated at 0.00%/yr and was not significantly different from zero based on the 95% confidence interval (P>0.05) (Table 5).
Intrinsic rate of natural increase = r = Ln(Nt)-Ln(N0)/t Doubling time of population in days = tD = 0.6931/r Nt = N0-e rt where Nt and N0 = final and initial populations, Generation time = Gent't = 1 / Divisions day-1 Divisions day-1 = Div.
In the black region of each graph, the hyperparasitoid intrinsic rate of increase is not great enough for it to invade the host-parasitoid system.
Chaoborus extract Trait Absent Present Juvenile body length Time to maturity -0.52 0.29 Mean clutch size 0.11 -0.04 Reproductive effort -0.17 0.19 Intrinsic rate of increase 0.28 0.09 Juvenile body depth Time to maturity -0.47 0.34 Mean clutch size 0.02 -0.15 Reproductive effort -0.23 0.15 Intrinsic rate of increase 0.26 0.13 Juvenile tailspine length Time to maturity -0.34 -0.01 Mean clutch size -0.09 0.29 Reproductive effort -0.36 0.24 Intrinsic rate of increase -0.08 0.29 In the presence of the extract, time to maturity was positively correlated with both body length and depth, possibly indicating a cost.
Life table parameters such as intrinsic rate of increase ([r.sub.m]), mean generation time (TG), finite rate of increase ([lambda]), and doubling time (DT) were calculated using Equations 1 to 4 of Birch (1948) and Carey (1993).

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