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Table 1 Statistical analysis of the Plackett-Burman design for IAA production by Streptomyces fradiae NKZ-259

From: Indole-3-acetic acid production by Streptomyces fradiae NKZ-259 and its formulation to enhance plant growth

Variable/Term Coefficient SE coefficient t-value p-value
Constant 37.923 0.481 78.77 0.000
X1 2.198 0.481 4.56 0.020*
X2 1.731 0.481 3.60 0.037*
X3 −4.055 0.481 −8.42 0.004*
X4 −1.453 0.481 − 3.02 0.057
X5 0.729 0.481 1.51 0.227
X6 4.142 0.481 8.60 0.003*
X7 7.864 0.481 16.33 0.000*
X8 −2.479 0.481 −5.15 0.014*
  1. R-sq = 99.38% R-sq (adj) = 97.74%
  2. SE, standard error; t, Student’s test; p, corresponding level of significance; *, significance at p < 0.05