Hi, Thanks for help. But I am still not clear. My question is: sst, a function of time, is an independent variable. and u is a dependent variable, which is also a function of time. How can we make a line plot when u is regressed onto sst? Apparently sst as an independent variable is not originally monotonic, it has be reshaped, right? The FAQ indicates that regresst only describes how to regress a variable (a function of time) into the independent variable T, Am I right? For example, we can do regression sst vs T using regresst.jnl The attached figure is a scatter plot of u (in Y-coordinate) VS sst ( in X-coordinate). Can you explain more details for my case? yx --- On Wed, 3/18/09, David Wang <climater@xxxxxxxxx> wrote: > From: David Wang <climater@xxxxxxxxx> > Subject: Re: [ferret_users] regression issue: one variable VS another variables > To: "yangxing zheng" <yangxingz@xxxxxxxxx> > Cc: ferret_users@xxxxxxxx > Date: Wednesday, March 18, 2009, 8:29 AM > Hi Yangxing, > > regresst.jnl is what you need. Please follow this FAQ: > > http://ferret.pmel.noaa.gov/FERRET_17sep07/FAQ/analysis/regressions.html > > It's the least square fit. > > HTH, > D. > > On Tue, Mar 17, 2009 at 7:56 PM, yangxing zheng > <yangxingz@xxxxxxxxx> wrote: > > > Hi, > > > > I do have two variables like area averaged sst, and u > (zonal winds) from l > > = 1:100 (for simple case, sst and u only has one > dimension of time) > > > > we can make scatter plot > > plot/vs sst,u > > > > Now I want to see how sensitive of u to sst, we > usually plot a line that > > describe the relationship between u and sst. How can > we make it in ferret? > > > > Attached is one example of scatter plot. > > > > Thanks. > > > > yx > > > > > > > > > -- > life grows, death doesn't. there is no dress rehearsal.
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