Видео

Hi Dr. Stockton Maxwell, I very appreciate the detailed introduction! I hava a question here, when do we need to normalize the tree ring data, cuz I didn't see any normalization before analyses? Looking forward to your reply! Thanks for the very useful video again~

It seems like half of the tree is gone from base does the tree survive after this?

Confusing! Do you need to run dcc function with climate of previous year’s May to current year’s October, if the chronology is residual? Pre whitening removes autocorrelation (persisrence). Then why is it necessary to look for -5 months? Can you explain it?

nice video. However, somewhere, incomplete explanation. For example, detrending method we choose depends on (17:10) the dataset and what types of signals to be retained. Do we need to understand that Cubic Smoothing Spline detrending method is for keeping climate signal (as shown in this video)? Why Freidman’s Super Smoother is not better than Spline for example for series 22, 26, 36 etc?

it's just an introductory tutorial. Real problem (what needs to be explained well) is how to perform crossdating with a rwl file with some misdated series, unlike all the correctly dated series in this tutorial

Hi Stockton thanks for your videos. Can I test the correlation between shorter samples (for example 30 years)?

Dear Maxwell, thank you very much for your video tutorials, which have been of great help to us beginners. I would like to ask you about the dcc function in R. I encountered an issue where it shows 'treeclim tries to use the maximum overlap in timespan for chronology and climate data. The overlap starts in NA, but to be able to use climate data from the previous year(s) (as you chose by setting 'selection' accordingly), the analysis starts in NA. Error in (start_year + offset):end_year: argument of length 0.' I saw someone else had the same problem in the comment section. Have there been any updates on this issue? I'd like to know the reason. Thank you.

Hello Max I'm a beginner when it comes to using R in dendronchronology studies and I follow your steps explained in your video for the treeclim package, I already had a chronology made, same with the date for temperatures and precipitation but when I want to run the code to made that dcc I've got this error treeclim tries to use the maximum overlap in timespan for chronology and climate data. The overlap starts in NA, but to be able to use climate data from the previous year(s) (as you chose by setting 'selection' accordingly), the analysis starts in NA. Error in (start_year + offset):end_year : argument of length 0 and I don't what to do to solve can you give me a piece of advice on how to solve. Thank you

YES

Thanks for the video! Have you ever used the dendroTools package to check climate-growth correlations?

Wow that looks like a great time! What an awesome set up!

Very useful video, thanks!

Very helpful, thank you!

Good evening can help me in reading the rings in the picture (took2022)

Helped me a lot! XDateR is a very useful tool. Thank you so much for the tutorial!

Hi, thanks for the great videos. I am trying to teach myself Dendrochronology, but have no background in that field. If you have a sample but you do not know where it came from, how do you go about the process of finding the correct Master Chronology? Im struggling to understand this first part. Would you plot the tree rings in Coorecoder without the Master reference and then bring the file into Cdendro and import the .rwl files from the ITRDB and try to cross match it? Then if you find a good correlation would you create a Master Chronology .wid file and use that and go back into the Coorecorder process? For example, if you were pretty sure that the wood was European and from Germany would you just import the relevant .rwl files from Germany and look for a correlation? Sorry for the stupid questions, im just a bit confused about what to do if you have an unknown sample and can't find and videos that explain this. Thanks in advance.

Thank you so much for your videos, it helps me a lot in doing my thesis. I am having some problems, I don't find a way out. Hope I will get an answer from you. I made a single chronology for 5 species but need to make a composite chronology from them. I tried to find some papers but got no idea. Can you please, suggest me a way out? Looking forward to your videos regarding climate reconstruction.

thank you for this tutorial! wher can i find databank for european wood?

Love from Poland :) this really helped me to grasp the idea! Thank you soo much!

can you show the format of csv file of chronology table?

Outstanding tutorial. Right enough info to do the job. I've compiled one myself, but this one is way better. I recommend this to my students.

Dear Maxwell, great tutorials, thank you, amigo. I just have a couple of questions with regard to this function. As I am only using CWD (from 1975:2011) as clim.dat and tr. chrono (1960:2011), I am not being able to run the previous year, also when I input: selection= .mean(6:8), the package cries this: treeclim needs at least two var. for calibration. So, I am only running selection= 6:8, in either static or evolving. Because for FIN cwd values are mostly in the summer.

Hi dear Dr. Stockton Maxwell, I have a query and i m looking forward for your kind response. Actually I am using r software for dendrochronological analysis. Could you please guide me about how to install latest version of it as many of the packages could not function in 4.2.1 version of r. Also i am anxiously waiting for your video on "defoliatR" for insect defoliage signals in tree cores. Video on named package will be a helping hand for studying tree on discussed parameters from moist and dry temperate mixed brodlef coniferous forests of Himalaya in Pakistan. Anxiously waiting for your kind reply. Regards: Amir Ali MPhil Scholar (Botany) Dendrochronology Laboratory Government College University Lahore, Pakistan.

Hi Dr. Maxell, very helpful videos and appreciate your efforts to reach us like beginners through science! I would like to cross-date my samples collected from Wisconsin. Where can I get or how can I establish a master chronology for my study species?

Dr. Maxwell, Thank you so much for this helpful video. Its a true gift to those of us just starting out. Question for you - I used Coorecorder to measure my cores and Cdendro for cross-dating/preparing my .rwl files to read into dplR. Curious if you could describe the approach for averaging multiple cores from a single tree before standardization. In your video, it appeared that you had two cores from at least a portion of your trees as well. I am familiar with the treemean () function in dplR, but I am not sure how to format the data appropriately with a tree id column and a core column. Any ideas here?

thanks a lot for the video

up to date, this is really hepful and am glad you put up this information Dr. stockton

Many Thanks, Stockton...Great Job

I gotta error in line 35 . When I click run, it says: selu_final.rwl (no such file or directory).

If I want the climatic data of year 2020 then how could I get? There is the data of only 2010.

Thank you very much Stockton!

Can you just type the packages we need to install during the analysis. I am beginner and i m finding difficulties understanding the video because it was not much zoomed. Thank you in advance

Hi! Can you please tell me the alternative package for dcc to run climate data response ! Will be great full to you

thank you so very much Dr. Stockton Maxwell, Really helpful video

Thanks for the very nice tutorial! Im new in teh field of dendrochronology and have a question regarding the sample size. Is there a minimum length for serious evaluation using dplR? I have read in the dendrochronological literature that a minimum length of 40 years is recommended (Cook, E. R.; Kairiukstis, L. A. 1990). My series are very short, from 10 to 26 years. So it works, but are that reliable results?

Dr. Maxwell, many thanks for your helpful tutorial! A quick troubleshooting question for you. After loading in a .rwl file, I am getting tripped up when I then select “Test towards ref.” with an error message popping up asking me to “Please, first select a sample as a Reference for the analysis!”. Prior to this step I had created a mean sample value and saved a .fil and wid file as you recommended in your video. Any thoughts about how to proceed?

Hello sir how can we separate growth of climate because growth of tree effect from many thing such as soil, elevation, aspect etc so how can we find growth with respect to climate only

Which tree species is?

amazing video Stockton! Was just wondering if there was a way to colour the individual lines of the spag.plot?

Excellent tutorial, thank you very much for producing it for all of us! Question, I have found that sometimes when I go to add a ring boundary that didn't get picked up in the first auto placing pass, the ring sometimes gets labeled as the next successive ring after the oldest (inner ring). Is there a way to manually assign the proper year?

Thank you so much for this and providing the code as well. It was so helpful! :)

Professor Stockhon, thank you very much and congratulations for this very didactic video. Could you also add the footnotes in this video to allow a good understanding? I, for example, do not understand the American accent very well.

Thank you very much for this content. Really good tutorial.

This looks nice, wish I'd studied at Radford University :-)

Hi, i´m start todo do some process in R, but i don´t know how create or generate .rwl docs or archives? how i can generate that? i see this format of docs in your code, for that i'm ask me

I really like this video, thank you a lot.

Thanks Stockton, love your tutorials, it is indeed very helpful.

Wow...Didn't see this before

This is helpful.... I have understood everything

Helpful