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--- howtos:calibration:projecting_into_history [2009/12/01 14:01]
shona.weldon
+++ howtos:calibration:projecting_into_history [2009/12/01 14:02] (current)
shona.weldon
@@ Line 14: / Line 14: @@
 The main danger here is that your linear trend variable, ratioFamPerPerPH[cr,t19101977], goes negative
-===== log and exponential lintrend=====
-Another way is to use lintrend with logarithm and exponential
-<code>
-local ratioFamPerPer[cr,t19782006] = familiesTot[cr,t19782006] / CTotPop[cr,t19782006]
-local ratioFamPerPerPH[cr,t19101977] = exp (max (lintrend (loge (ratioFamPerPer[cr,t19782006]); time=1910), 0))
-familiesPH[cr,t19101977] = extract (CEEFpop[cr,t18511990]; time:1910..1977) * ratioFamPerPerPH[cr,t19101977]
-</code>
 ===== Ratio with linint =====
@@ Line 45: / Line 36: @@
 The main problem with this approach is that it is very flat over pre-history time
+===== log and exponential lintrend=====
+Another way is to use lintrend with logarithm and exponential
+<code>
+local ratioFamPerPer[cr,t19782006] = familiesTot[cr,t19782006] / CTotPop[cr,t19782006]
+local ratioFamPerPerPH[cr,t19101977] = exp (max (lintrend (loge (ratioFamPerPer[cr,t19782006]); time=1910), 0))
+familiesPH[cr,t19101977] = extract (CEEFpop[cr,t18511990]; time:1910..1977) * ratioFamPerPerPH[cr,t19101977]
+</code>

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