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howtos:calibration:projecting_into_history [2009/12/01 13:54] shona.weldon |
howtos:calibration:projecting_into_history [2009/12/01 14:01] shona.weldon |
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===== log and exponential lintrend===== | ===== log and exponential lintrend===== | ||
- | Another way to use lintrend and avoid the negatives it to use logarithm and exponential | + | Another way is to use lintrend with logarithm and exponential |
<code> | <code> | ||
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===== Ratio with linint ===== | ===== Ratio with linint ===== | ||
- | A safer way is to create an extra variable which is the ratio of the first year of pre-history to the first year of history and then linear interpret between these 2 points for the historic period. | + | A safer way is to create an extra variable which is the ratio of the first year of pre-history (ratioFamPerPer1910to1978) to the first year of history and then linear interpret between these 2 points for the historic period. |
<code> | <code> | ||
- | local ratioFamPerPer[cr,th] = familiesTot[cr,th] / CTotPop[cr,th] | + | ! Build an object to hold the time from beginning of pre history to end of history and put in the part we know |
- | local ratioFamPerPerPHx[cr,t19101977] = changeseq (copyshape (ratioFamPerPer[cr,th]); dim=time, start=1910) | + | local ratioFamPerPer[cr,t19782006] = familiesTot[cr,t19782006] / CTotPop[cr,t19782006] |
- | ratioFamPerPerPHx[cr,t19101977] = insert (ratioFamPerPer[cr,th]; time->time:1978) | + | local ratioFamPerPerPHx[cr,t19101977] = changeseq (copyshape (ratioFamPerPer[cr,t19782006]); dim=time, start=1910) |
- | ratioFamPerPerPHx[cr,t19101977] = insert (extract (ratioFamPerPer[cr,th]; time:1978, shrink=on) * \ | + | ratioFamPerPerPHx[cr,t19101977] = insert (ratioFamPerPer[cr,t19782006]; time->time:1978) |
+ | |||
+ | ! Multiply the ratioFamPerPer1910to1978 agains against the first year of history and insert that as the first year of pre history | ||
+ | ratioFamPerPerPHx[cr,t19101977] = insert (extract (ratioFamPerPer[cr,t19782006]; time:1978, shrink=on) * \ | ||
ratioFamPerPer1910to1978[cr]; time:1910) | ratioFamPerPer1910to1978[cr]; time:1910) | ||
+ | ! Do Linear interpolation between these values | ||
local ratioFamPerPerPH[cr,t19101977] = extract (linint (ratioFamPerPerPHx[cr,t19101977]); time:+0..1977) | local ratioFamPerPerPH[cr,t19101977] = extract (linint (ratioFamPerPerPHx[cr,t19101977]); time:+0..1977) | ||
+ | ! Apply the ratio | ||
familiesPH[cr,t19101977] = extract (CEEFpop[cr,t18511990]; time:1910..1977) * ratioFamPerPerPH[cr,t19101977] | familiesPH[cr,t19101977] = extract (CEEFpop[cr,t18511990]; time:1910..1977) * ratioFamPerPerPH[cr,t19101977] | ||
</code> | </code> |