TY - GEN
N1 - 24 cm
N2 - An important source of risk in agricultural production is the variability to crop yields reflecting irregularly changing weather. This variability may be described as a stochastic process that has a function of density. Analyses of historical data on crop yields reveal that the function of density changed from right-skewed to left-skewed, along with increasing mean yields. All examined yields of crops cultivated recently in Poland demonstrate the left skew, which does not diminish with the aggregation of acreage. A fairly good approximation of the probability distribution for actual yields may be obtained using the log-normal distribution with an inverted abscissa.
L1 - http://rcin.org.pl/igipz/Content/55501/PDF/WA51_74830_r2009-t82-no1_G-Polonica-Gorski.pdf
M3 - Text
J2 - Geographia Polonica Vol. 82 No. 1 (2009)
PY - 2009
IS - 1
EP - 67
KW - crop yields
KW - density function
KW - log-normal distribution
KW - area aggregation
KW - scaling of variance
A1 - Górski, Tadeusz
PB - IGiPZ PAN
CY - Warszawa
VL - 82
SP - 61
T1 - A probability distribution for crop yields in Poland
UR - http://rcin.org.pl/igipz/dlibra/publication/edition/55501
ER -