[R] Making a prediction model from a plot

[joe1985]

Hello

I have plot looking like this:

http://www.nabble.com/file/p22453304/Index%2Bgraf.jpeg 

Where each continues line corresponds to a period og days, and each break on
the line corresponds to a shift in the index level. 

So what i thought about was, is it possible to make a model predicting the
index level depending on the length of period?

Here is a bit of my dataset:

> b[b$a.CHR_NR==97592,]
     a.CHR_NR a.SALMO_INDEX   a.x a.diffdato1 a.akkusum
1492    97592          20.6         62          34        34
1493    97592          18.7         62          14        48
1494    97592          18.1         62          14        62
1495    97592          19.8         16          16        16
1496    97592          18.1         139           7         7
1497    97592          18.1         139          10        17
1498    97592          22.2         139           3        20
1499    97592          22.2         139          11        31
1500    97592          23.2         139           7        38
1501    97592          23.2         139          23        61
1502    97592          26.2         139           7        68
1503    97592          26.2         139          30        98
1504    97592          15.2          139          10       108
1505    97592          15.2          139           7       115
1506    97592          10.8         139           4       119
1507    97592          10.8         139          20       139
1508    97592          15.2          62           6         6
1509    97592          15.2          62          28        34
1510    97592          12.3           62           4        38
1511    97592          12.3           62          24        62
1512    97592          14.2            22          10        10
1513    97592          14.2            22          12        22
1514    97592          31.6           140          32        32
1515    97592          35.1           140          24        56
1516    97592          30.0           140          39        95
1517    97592          10.9            140          11       106
1518    97592          11.8            140          34       140
1519    97592          10.1            329          28        28
1520    97592          10.6            329          30        58
1521    97592          57.0             329          30        88
1522    97592          47.3             329          27       115
1523    97592          30.4             329          28       143
1524    97592          19.3             329          21       164
1525    97592          28.8             329          39       203
1526    97592          20.4              329          23       226
1527    97592          35.1              329          26       252
1528    97592          21.3               329          32       284
1529    97592          16.6               329          45       329

Where a.CHR_NR is a particular herd (i have a lot of herds),  a.SALMO_INDEX
is the index level (the responds variable), a.x is the length of period (the
lines on the plot), a.diffdato1 is the days in the period and a.akkusum is
the cumulated sum of a.diffdato1 making the breaks on the lines.

Hope you can help me  
 
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