smoothing quarterly data and extract data on each day

Hi,?everybody

I?have?a?quarterly?zoo?object?named "dat1" as below.?xyplot(dat1)?and?xyplot(dat1,type="smooth")?may?
obtain?both?original?and?smoothed?plot,?and?these?two?plots?are?just?what?I?need,?however?I?also
need?those?smoothed?values?on?each?day,?and?I?have?no?idea?how?to?extract?from?the?smoothed?curve.
I?think?there?must?be?some?convinent?way?to?deal?with?this?kind?of?problem. Anyone knows about it?

Thanks a lot!

?dat1

X1???????X2???????X3???????X4????????X5
2008?Q1?3482.858?1250.236?3548.769?4931.883??497.3590
2008?Q2?3531.582?1355.288?3645.622?5054.060??524.8273
2008?Q3?3783.050?1380.224?3719.840?4827.296??626.0529
2008?Q4?4372.995?1565.386?3827.486?5014.124??769.9170
2009?Q1?4485.311?1778.264?4486.163?5759.063??891.0500
2009?Q2?4506.971?1920.969?4704.324?6026.117??934.0728
2009?Q3?4791.432?1904.100?4837.732?6101.084??884.6493
2009?Q4?5393.146?1917.826?4971.702?6178.358??888.6124
2010?Q1?5377.333?2034.175?5222.298?6620.797??918.8237
2010?Q2?5651.565?2117.686?5273.992?6789.510??964.9723
2010?Q3?5905.428?2138.144?5382.343?6959.202?1107.4141
2010?Q4?6420.900?2248.762?5485.862?7003.115?1228.2340
2011?Q1?6595.900?2328.679?5745.658?7567.216?1284.2346
2011?Q2?6679.854?2474.070?5973.663?7920.905?1430.5884
2011?Q3?6523.676?2473.112?6016.118?8057.043?1479.7814
2011?Q4?7195.303?2632.994?6337.770?8259.334?1582.4205
2012?Q1?7137.809?2824.209?6950.471?8969.470?1647.5123
2012?Q2?7084.198?2989.912?6997.699?9314.090?1798.0352



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Zhenfei Yuan <zfyuan at mail.ustc.edu.cn>