Table 1

Parameter estimates of two-parameter Weibull failure model fitted to the survival characteristics of Lymnaea stagnalis populations used in the present study
Population a(error) c(error) s· 10-2(error) % survival at sampling age range (month)
Junior 1 490 (9.9) 3.7 (0.25) −0.26 (1.37 · 10-2) >95% 5-7
Senior 1 440 (8.3) 4.3 (0.29) −0.34 (1.19 · 10-2) <25% 18-20
Senior 2 550 (9.6) 4.0 (0.29) −0.25 (1.56 · 10-2) <25% 21-22
Senior 3 550 (7.4) 4.5 (0.29) −0.28 (1.91 · 10-2) <25% 21-22
Senior 4 570 (9.6) 3.8 (0.28) −0.23 (1.66 · 10-2) <25% 22-23

Note: “a” and “c” are parameters of the two-parameter Weibull model (“a” is median age; “c” is the shape parameter; “s” is slope of tangent of survival curve at median age).

Watson et al.

Watson et al. BMC Neuroscience 2012 13:103   doi:10.1186/1471-2202-13-103

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